Abstract The Benedeniinae, the largest of nine capsalid subfamilies, includes genera with an aseptate, apapillate haptor and a pair of discrete testes. Eight of 13 nominal benedeniine genera, Benedenia Diesing, 1858 (the type genus); Allobenedenia Yamaguti, 1963; Allometabenedeniella Velasquez, 1982; Dioncopseudobenedenia Yamaguti, 1965; Lagenivaginopseudobenedenia Yamaguti, 1966; Oligoncobenedenia Yamaguti, 1965; Pseudallobenedenia Yamaguti, 1966 and Tareenia, Hussey, 1986 are revised using type material of most nominal species with observations for some species from new material. Allobenedenia and Allometabenedeniella are transferred to the Trochopodinae Price, 1936 emend. Sproston, 1946 because all valid species of both genera bear septa on the ventral haptor surface. Allobenedenia ishikawae (Goto, 1894) Yamaguti, 1963 is transferred to Benedenia because its haptor is aseptate. I recognize Menziesia Gibson, 1976, based on the form of the male copulatory organ and associated structures and include five species in it. Tareenia Hussey, 1986 is synonymised with Benedenia because characters used to differentiate the two genera do not indicate discontinuities at the generic level. Benedeniella Johnston, 1929, Calicobenedenia Kritsky and Fennessy, 1999 and Trimusculotrema Whittington and Barton, 1990 are considered to belong in Entobdellinae Bychowsky, 1957, pending further studies on that group. The anatomy of Calicobenedenia is outlined briefly; the other genera are not discussed here in detail. Lachishia n. g. is described, based on the structure of the male copulatory organ and a species is transferred to it from Dioncopseudobenedenia. I describe four new species of benedeniines from teleosts caught at Heron and Green Islands, Australia namely: Benedenia ernsti n. sp. from the gills of Symphorus nematophorus; Benedenia fieldsi n. sp. from the fins of Cephalopholis boenak, C. cyanostigma and C. miniatus; Benedenia haywardi n. sp. from the skin of S. nematophorus and Dioncopsudobenedenia ancoralis n. sp. from the gills of Siganus lineatus. Benedenia akaisaki Iwata, 1990 is synonymised with B. ovata (Goto, 1894) Johnston, 1929, B. kintoki Iwata, 1990 is synonymised with B. elongata (Yamaguti, 1968) Egorova, 1997, B. sargocentron Zhang, Yang and Liu, 2001 is synonymised with B. hawaiiensis Yamaguti, 1968 and Pseudallobenedenia arabica Timofeeva, 1995 is synonymised with P. opakapaka Yamaguti, 1966. Benedenia madai Ishii and Sawada, 1938, B. pagrosomi Ishii and Sawada, 1938 and Allobenedenia pedunculata Raju and Rao, 1980 are considered species inquirendae. I examined an outbreak in aquaculture of the pathogenic benedeniine, Neobenedenia melleni (MacCallum, 1927) Yamaguti, 1963 and report this species for the first time in Australia. I examined the pathogenesis caused by this parasite by histology of host tissue. Possible routes of introduction to the farm in question are investigated and studies are detailed that should be undertaken in Australia to manage future outbreaks of N. melleni. Capsalids usually colonise new hosts by an infective ciliated oncomiracidium. An experiment was conducted to ascertain whether cleaner fish Labroides dimidiatus could transfer adult skin-parasitic monogeneans from one host fish to another. I have shown that transmission of adult monogeneans between two individuals of Hemigymnus melapterus by cleaner fish can occur. In coral reef environments, frequent contact between unrelated hosts involved in cleaning interactions might create previously unsuspected evolutionary pressures. I discuss the implications of this discovery for host-specificity and lateral transmission of monogeneans. General biological studies of monogeneans are necessary to understand the evolution, pathology, epidemiology, phylogeny and taxonomy of these parasites. My study provides a taxonomic system which, when applied to other capsalid subfamilies, should help prevent errors and create a clear system of classification for the entire family.

Abstract The Benedeniinae, the largest of nine capsalid subfamilies, includes genera with an aseptate, apapillate haptor and a pair of discrete testes. Eight of 13 nominal benedeniine genera, Benedenia Diesing, 1858 (the type genus); Allobenedenia Yamaguti, 1963; Allometabenedeniella Velasquez, 1982; Dioncopseudobenedenia Yamaguti, 1965; Lagenivaginopseudobenedenia Yamaguti, 1966; Oligoncobenedenia Yamaguti, 1965; Pseudallobenedenia Yamaguti, 1966 and Tareenia, Hussey, 1986 are revised using type material of most nominal species with observations for some species from new material. Allobenedenia and Allometabenedeniella are transferred to the Trochopodinae Price, 1936 emend. Sproston, 1946 because all valid species of both genera bear septa on the ventral haptor surface. Allobenedenia ishikawae (Goto, 1894) Yamaguti, 1963 is transferred to Benedenia because its haptor is aseptate. I recognize Menziesia Gibson, 1976, based on the form of the male copulatory organ and associated structures and include five species in it. Tareenia Hussey, 1986 is synonymised with Benedenia because characters used to differentiate the two genera do not indicate discontinuities at the generic level. Benedeniella Johnston, 1929, Calicobenedenia Kritsky and Fennessy, 1999 and Trimusculotrema Whittington and Barton, 1990 are considered to belong in Entobdellinae Bychowsky, 1957, pending further studies on that group. The anatomy of Calicobenedenia is outlined briefly; the other genera are not discussed here in detail. Lachishia n. g. is described, based on the structure of the male copulatory organ and a species is transferred to it from Dioncopseudobenedenia. I describe four new species of benedeniines from teleosts caught at Heron and Green Islands, Australia namely: Benedenia ernsti n. sp. from the gills of Symphorus nematophorus; Benedenia fieldsi n. sp. from the fins of Cephalopholis boenak, C. cyanostigma and C. miniatus; Benedenia haywardi n. sp. from the skin of S. nematophorus and Dioncopsudobenedenia ancoralis n. sp. from the gills of Siganus lineatus. Benedenia akaisaki Iwata, 1990 is synonymised with B. ovata (Goto, 1894) Johnston, 1929, B. kintoki Iwata, 1990 is synonymised with B. elongata (Yamaguti, 1968) Egorova, 1997, B. sargocentron Zhang, Yang and Liu, 2001 is synonymised with B. hawaiiensis Yamaguti, 1968 and Pseudallobenedenia arabica Timofeeva, 1995 is synonymised with P. opakapaka Yamaguti, 1966. Benedenia madai Ishii and Sawada, 1938, B. pagrosomi Ishii and Sawada, 1938 and Allobenedenia pedunculata Raju and Rao, 1980 are considered species inquirendae. I examined an outbreak in aquaculture of the pathogenic benedeniine, Neobenedenia melleni (MacCallum, 1927) Yamaguti, 1963 and report this species for the first time in Australia. I examined the pathogenesis caused by this parasite by histology of host tissue. Possible routes of introduction to the farm in question are investigated and studies are detailed that should be undertaken in Australia to manage future outbreaks of N. melleni. Capsalids usually colonise new hosts by an infective ciliated oncomiracidium. An experiment was conducted to ascertain whether cleaner fish Labroides dimidiatus could transfer adult skin-parasitic monogeneans from one host fish to another. I have shown that transmission of adult monogeneans between two individuals of Hemigymnus melapterus by cleaner fish can occur. In coral reef environments, frequent contact between unrelated hosts involved in cleaning interactions might create previously unsuspected evolutionary pressures. I discuss the implications of this discovery for host-specificity and lateral transmission of monogeneans. General biological studies of monogeneans are necessary to understand the evolution, pathology, epidemiology, phylogeny and taxonomy of these parasites. My study provides a taxonomic system which, when applied to other capsalid subfamilies, should help prevent errors and create a clear system of classification for the entire family.

Abstract The Benedeniinae, the largest of nine capsalid subfamilies, includes genera with an aseptate, apapillate haptor and a pair of discrete testes. Eight of 13 nominal benedeniine genera, Benedenia Diesing, 1858 (the type genus); Allobenedenia Yamaguti, 1963; Allometabenedeniella Velasquez, 1982; Dioncopseudobenedenia Yamaguti, 1965; Lagenivaginopseudobenedenia Yamaguti, 1966; Oligoncobenedenia Yamaguti, 1965; Pseudallobenedenia Yamaguti, 1966 and Tareenia, Hussey, 1986 are revised using type material of most nominal species with observations for some species from new material. Allobenedenia and Allometabenedeniella are transferred to the Trochopodinae Price, 1936 emend. Sproston, 1946 because all valid species of both genera bear septa on the ventral haptor surface. Allobenedenia ishikawae (Goto, 1894) Yamaguti, 1963 is transferred to Benedenia because its haptor is aseptate. I recognize Menziesia Gibson, 1976, based on the form of the male copulatory organ and associated structures and include five species in it. Tareenia Hussey, 1986 is synonymised with Benedenia because characters used to differentiate the two genera do not indicate discontinuities at the generic level. Benedeniella Johnston, 1929, Calicobenedenia Kritsky and Fennessy, 1999 and Trimusculotrema Whittington and Barton, 1990 are considered to belong in Entobdellinae Bychowsky, 1957, pending further studies on that group. The anatomy of Calicobenedenia is outlined briefly; the other genera are not discussed here in detail. Lachishia n. g. is described, based on the structure of the male copulatory organ and a species is transferred to it from Dioncopseudobenedenia. I describe four new species of benedeniines from teleosts caught at Heron and Green Islands, Australia namely: Benedenia ernsti n. sp. from the gills of Symphorus nematophorus; Benedenia fieldsi n. sp. from the fins of Cephalopholis boenak, C. cyanostigma and C. miniatus; Benedenia haywardi n. sp. from the skin of S. nematophorus and Dioncopsudobenedenia ancoralis n. sp. from the gills of Siganus lineatus. Benedenia akaisaki Iwata, 1990 is synonymised with B. ovata (Goto, 1894) Johnston, 1929, B. kintoki Iwata, 1990 is synonymised with B. elongata (Yamaguti, 1968) Egorova, 1997, B. sargocentron Zhang, Yang and Liu, 2001 is synonymised with B. hawaiiensis Yamaguti, 1968 and Pseudallobenedenia arabica Timofeeva, 1995 is synonymised with P. opakapaka Yamaguti, 1966. Benedenia madai Ishii and Sawada, 1938, B. pagrosomi Ishii and Sawada, 1938 and Allobenedenia pedunculata Raju and Rao, 1980 are considered species inquirendae. I examined an outbreak in aquaculture of the pathogenic benedeniine, Neobenedenia melleni (MacCallum, 1927) Yamaguti, 1963 and report this species for the first time in Australia. I examined the pathogenesis caused by this parasite by histology of host tissue. Possible routes of introduction to the farm in question are investigated and studies are detailed that should be undertaken in Australia to manage future outbreaks of N. melleni. Capsalids usually colonise new hosts by an infective ciliated oncomiracidium. An experiment was conducted to ascertain whether cleaner fish Labroides dimidiatus could transfer adult skin-parasitic monogeneans from one host fish to another. I have shown that transmission of adult monogeneans between two individuals of Hemigymnus melapterus by cleaner fish can occur. In coral reef environments, frequent contact between unrelated hosts involved in cleaning interactions might create previously unsuspected evolutionary pressures. I discuss the implications of this discovery for host-specificity and lateral transmission of monogeneans. General biological studies of monogeneans are necessary to understand the evolution, pathology, epidemiology, phylogeny and taxonomy of these parasites. My study provides a taxonomic system which, when applied to other capsalid subfamilies, should help prevent errors and create a clear system of classification for the entire family.

The Capsalidae is a diverse family of ectoparasites of marine fish (Platyhelminthes: Monogenea). It is a large family with approximately 180 described species and many more yet to be discovered. Capsalids have a global distribution and parasitise a diversity of hosts from the Chondrichthyes to bony fishes. A morphological classification exists for the family based on a few key characters such as testes number, their arrangement and morphology of the posterior attachment organ (haptor). Phylogenetic relationships within the family and its position within the Monogenea are largely unexplored. I have used various molecular phylogenetic techniques to resolve relationships and explore the evolution and radiation of this family. Specimens from the Capsalidae and other monogenean families (outgroups) were obtained through fresh collections and generous donations by other parasitologists. Specimens were stored in 95% undenatured ethanol. Three unlinked nuclear genes (28S ribosomal RNA, Histone 3 and Elongation Factor 1 α) and two mitochondrial genes (Cytochrome Oxidase 3 and Cytochrome B) were amplified for 78 capsalid taxa in 28 genera representing all nine subfamilies and 30 outgroup taxa (eight Polyopisthocotylea and 22 Monopisthocotylea). Analyses showed the Capsalidae is monophyletic, with the sister group remaining unresolved. Some analyses supported Gyrodactylidae and Udonellidae as the sister group but in other analyses, it was unresolved with the Monocotylidae and Microbothriidae also possible sister groups. The Capsalinae, Encotyllabinae and Nitzschiinae are monophyletic, but analyses did not support monophyly for the Benedeniinae, Entobdellinae and Trochopodinae. Monophyly was supported for Capsala, Capsaloides, Encotyllabe, Entobdella, Listrocephalos, Neobenedenia, Nitzschia and Tristoma, but Metabenedeniella is paraphyletic and Benedenia and Neoentobdella are polyphyletic. Comparisons of the distribution of character states for the small number of morphological characters on a molecular phylogeny show a high frequency of apparent homoplasy. Consequently the current morphological classification for the Capsalidae shows little correspondence with the phylogenetic hypotheses I present. I also sequenced the first complete mitochondrial (mt) genome for a capsalid species, Benedenia seriolae. The mt genome of B. seriolae shows some tRNA rearrangements in comparison to three Gyrodactylus spp. (Gyrodactylidae), the only other complete monopisthocotylean mt genomes sequenced. It also lacks the duplicated, conserved non-coding regions present in Gyrodactylus spp. making the genome smaller in size. I combined this genome with other available platyhelminth mt genomes to investigate the monophyly of Monogenea and the evolution of diet across the Neodermata. Results confirm paraphyly for the Monogenea and also suggest paraphyly for the epidermal feeding Monopisthocotylea. I hypothesise that the Monopisthocotylea represent the first shift to parasitism in the Neodermata from a free living ancestor and following this, there was a dietary shift to blood feeding (Polyopisthocotylea). The Digenea and Cestoda independently evolved dietary specialisations to suit their diverse microhabitats and broad range of vertebrate final hosts. Using Elongation Factor 1 α I have estimated molecular divergence dates for the Neodermata, Monogenea and Capsalidae. Molecular clock analyses estimate the Neodermata diverged from the free living platyhelminths 513 million years ago (mya) (95% HPD [highest posterior density]: 473–605) before the appearance of vertebrates in the fossil record. The Monogenea diverged from the other neodermatan classes 441 mya (95% HPD: 420–547) coinciding with the appearance of fish in the fossil record. The most recent common ancestor of the Capsalidae arose approximately 235 million years ago (95% HPD: 200–274) following the Permian/Triassic extinction event and coinciding with the diversification of bony fishes in the marine environment. I compared the capsalid phylogeny to a phylogeny of fishes that I generated using eight nuclear and three mt genes to explore the evolution and the radiation of the Capsalidae across fishes. There is no significant global signal of coevolution with only five parasite-host associations that may be a result of coevolution. Estimated molecular divergence dates are also compared and do not reveal temporal congruence. Radiation of the family may have been driven by host switching constrained by shared host ecology, biology, behaviour and plasticity in morphological adaptations by the parasites. This study advances our understanding of the evolution of this monogenean family and provides insights into the evolution of the Neodermata and the complicated realities of reconstructing the evolutionary history of parasitic groups. / http://proxy.library.adelaide.edu.au/login?url= http://library.adelaide.edu.au/cgi-bin/Pwebrecon.cgi?BBID=1522353 / Thesis (Ph.D.) -- University of Adelaide, School of Earth and Environmental Sciences, 2010

Abstract The Benedeniinae, the largest of nine capsalid subfamilies, includes genera with an aseptate, apapillate haptor and a pair of discrete testes. Eight of 13 nominal benedeniine genera, Benedenia Diesing, 1858 (the type genus); Allobenedenia Yamaguti, 1963; Allometabenedeniella Velasquez, 1982; Dioncopseudobenedenia Yamaguti, 1965; Lagenivaginopseudobenedenia Yamaguti, 1966; Oligoncobenedenia Yamaguti, 1965; Pseudallobenedenia Yamaguti, 1966 and Tareenia, Hussey, 1986 are revised using type material of most nominal species with observations for some species from new material. Allobenedenia and Allometabenedeniella are transferred to the Trochopodinae Price, 1936 emend. Sproston, 1946 because all valid species of both genera bear septa on the ventral haptor surface. Allobenedenia ishikawae (Goto, 1894) Yamaguti, 1963 is transferred to Benedenia because its haptor is aseptate. I recognize Menziesia Gibson, 1976, based on the form of the male copulatory organ and associated structures and include five species in it. Tareenia Hussey, 1986 is synonymised with Benedenia because characters used to differentiate the two genera do not indicate discontinuities at the generic level. Benedeniella Johnston, 1929, Calicobenedenia Kritsky and Fennessy, 1999 and Trimusculotrema Whittington and Barton, 1990 are considered to belong in Entobdellinae Bychowsky, 1957, pending further studies on that group. The anatomy of Calicobenedenia is outlined briefly; the other genera are not discussed here in detail. Lachishia n. g. is described, based on the structure of the male copulatory organ and a species is transferred to it from Dioncopseudobenedenia. I describe four new species of benedeniines from teleosts caught at Heron and Green Islands, Australia namely: Benedenia ernsti n. sp. from the gills of Symphorus nematophorus; Benedenia fieldsi n. sp. from the fins of Cephalopholis boenak, C. cyanostigma and C. miniatus; Benedenia haywardi n. sp. from the skin of S. nematophorus and Dioncopsudobenedenia ancoralis n. sp. from the gills of Siganus lineatus. Benedenia akaisaki Iwata, 1990 is synonymised with B. ovata (Goto, 1894) Johnston, 1929, B. kintoki Iwata, 1990 is synonymised with B. elongata (Yamaguti, 1968) Egorova, 1997, B. sargocentron Zhang, Yang and Liu, 2001 is synonymised with B. hawaiiensis Yamaguti, 1968 and Pseudallobenedenia arabica Timofeeva, 1995 is synonymised with P. opakapaka Yamaguti, 1966. Benedenia madai Ishii and Sawada, 1938, B. pagrosomi Ishii and Sawada, 1938 and Allobenedenia pedunculata Raju and Rao, 1980 are considered species inquirendae. I examined an outbreak in aquaculture of the pathogenic benedeniine, Neobenedenia melleni (MacCallum, 1927) Yamaguti, 1963 and report this species for the first time in Australia. I examined the pathogenesis caused by this parasite by histology of host tissue. Possible routes of introduction to the farm in question are investigated and studies are detailed that should be undertaken in Australia to manage future outbreaks of N. melleni. Capsalids usually colonise new hosts by an infective ciliated oncomiracidium. An experiment was conducted to ascertain whether cleaner fish Labroides dimidiatus could transfer adult skin-parasitic monogeneans from one host fish to another. I have shown that transmission of adult monogeneans between two individuals of Hemigymnus melapterus by cleaner fish can occur. In coral reef environments, frequent contact between unrelated hosts involved in cleaning interactions might create previously unsuspected evolutionary pressures. I discuss the implications of this discovery for host-specificity and lateral transmission of monogeneans. General biological studies of monogeneans are necessary to understand the evolution, pathology, epidemiology, phylogeny and taxonomy of these parasites. My study provides a taxonomic system which, when applied to other capsalid subfamilies, should help prevent errors and create a clear system of classification for the entire family.

Abstract The Benedeniinae, the largest of nine capsalid subfamilies, includes genera with an aseptate, apapillate haptor and a pair of discrete testes. Eight of 13 nominal benedeniine genera, Benedenia Diesing, 1858 (the type genus); Allobenedenia Yamaguti, 1963; Allometabenedeniella Velasquez, 1982; Dioncopseudobenedenia Yamaguti, 1965; Lagenivaginopseudobenedenia Yamaguti, 1966; Oligoncobenedenia Yamaguti, 1965; Pseudallobenedenia Yamaguti, 1966 and Tareenia, Hussey, 1986 are revised using type material of most nominal species with observations for some species from new material. Allobenedenia and Allometabenedeniella are transferred to the Trochopodinae Price, 1936 emend. Sproston, 1946 because all valid species of both genera bear septa on the ventral haptor surface. Allobenedenia ishikawae (Goto, 1894) Yamaguti, 1963 is transferred to Benedenia because its haptor is aseptate. I recognize Menziesia Gibson, 1976, based on the form of the male copulatory organ and associated structures and include five species in it. Tareenia Hussey, 1986 is synonymised with Benedenia because characters used to differentiate the two genera do not indicate discontinuities at the generic level. Benedeniella Johnston, 1929, Calicobenedenia Kritsky and Fennessy, 1999 and Trimusculotrema Whittington and Barton, 1990 are considered to belong in Entobdellinae Bychowsky, 1957, pending further studies on that group. The anatomy of Calicobenedenia is outlined briefly; the other genera are not discussed here in detail. Lachishia n. g. is described, based on the structure of the male copulatory organ and a species is transferred to it from Dioncopseudobenedenia. I describe four new species of benedeniines from teleosts caught at Heron and Green Islands, Australia namely: Benedenia ernsti n. sp. from the gills of Symphorus nematophorus; Benedenia fieldsi n. sp. from the fins of Cephalopholis boenak, C. cyanostigma and C. miniatus; Benedenia haywardi n. sp. from the skin of S. nematophorus and Dioncopsudobenedenia ancoralis n. sp. from the gills of Siganus lineatus. Benedenia akaisaki Iwata, 1990 is synonymised with B. ovata (Goto, 1894) Johnston, 1929, B. kintoki Iwata, 1990 is synonymised with B. elongata (Yamaguti, 1968) Egorova, 1997, B. sargocentron Zhang, Yang and Liu, 2001 is synonymised with B. hawaiiensis Yamaguti, 1968 and Pseudallobenedenia arabica Timofeeva, 1995 is synonymised with P. opakapaka Yamaguti, 1966. Benedenia madai Ishii and Sawada, 1938, B. pagrosomi Ishii and Sawada, 1938 and Allobenedenia pedunculata Raju and Rao, 1980 are considered species inquirendae. I examined an outbreak in aquaculture of the pathogenic benedeniine, Neobenedenia melleni (MacCallum, 1927) Yamaguti, 1963 and report this species for the first time in Australia. I examined the pathogenesis caused by this parasite by histology of host tissue. Possible routes of introduction to the farm in question are investigated and studies are detailed that should be undertaken in Australia to manage future outbreaks of N. melleni. Capsalids usually colonise new hosts by an infective ciliated oncomiracidium. An experiment was conducted to ascertain whether cleaner fish Labroides dimidiatus could transfer adult skin-parasitic monogeneans from one host fish to another. I have shown that transmission of adult monogeneans between two individuals of Hemigymnus melapterus by cleaner fish can occur. In coral reef environments, frequent contact between unrelated hosts involved in cleaning interactions might create previously unsuspected evolutionary pressures. I discuss the implications of this discovery for host-specificity and lateral transmission of monogeneans. General biological studies of monogeneans are necessary to understand the evolution, pathology, epidemiology, phylogeny and taxonomy of these parasites. My study provides a taxonomic system which, when applied to other capsalid subfamilies, should help prevent errors and create a clear system of classification for the entire family.

Submitted by Socorro Pontes (socorrop@ufersa.edu.br) on 2017-06-29T12:11:05Z No. of bitstreams: 1 BrunaLFF_DISSERT.pdf: 1489360 bytes, checksum: b80c12e94b27433d39f8e4d7c7b1d47e (MD5) / Made available in DSpace on 2017-06-29T12:11:06Z (GMT). No. of bitstreams: 1 BrunaLFF_DISSERT.pdf: 1489360 bytes, checksum: b80c12e94b27433d39f8e4d7c7b1d47e (MD5) Previous issue date: 2017-02-21 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / Haemulon plumierii are coastal fish that inhabit waters from the Chesapeake Bay - US, Gulf of Mexico, Caribbean and the entire coast of Brazil. Fish are the aquatic vertebrates that have the highest rates of parasitism and use different reproductive tactics in their life strategy to maximize reproduction and ensure the survival of their offspring to adulthood. The present work verified whether the ectoparasitism by monogenetic can influence the reproductive tactics of H. plumierii in marine waters in the North Atlantic Ocean Southwest (4º 50'57 ''S and 37º51'36''O), near the Rio Grande do Norte / Brazil, for that, the parasitic research of monogenetic was carried out and the study of the reproductive tactics of H. Plumierii. 240 copies were captured of H. plumierii hosts in the period from august 2015 to july 2016, with amplitudes of total weight between 84.5 to 517.5g and total length of 175 to 315mm. Monogenetics parasitized 106 H. plumierii fish among 240 examined, and 162 parasites were collected that were distributed in two subclasses: Monopisthocotylea and Polyopisthocotylea. Monopisthocotylea of the family Capsalidae in the genus Encotyllabe (75 in the gills and 9 in the skin) and Entobdella (1 in the gills and 17 in the skin); Polyopisthocotylea in the family Diclidophoridae in the genus Choricotyle (51 in the gills and 9 in the skin). H. plumierii was identified as a new host for the monogenéticos Encotyllabe sp., Entobdella hipoglossi, and Choricotyle sp., being the first record of the genus Entobdella in the family Haemulidae. The monogenetic parasites had a higher parasite preference for the gills, presenting low parasitic ecological indices. It was determined that H. plumierii are seasonal strategist fish in which males present greater total weight, total length and number in relation to females, however, there were no significant differences. It was recorded that the H. plumierii species has the following reproductive tactics: growth of the negative allometric type indicating a greater body increase in length than in weight; independent of this immature (young) stage it was verified macroscopically that adults have three stages of gonadal development (in maturation, mature and emptied) during the reproductive cycle; this animal altered its reproductive strategy, initiating reproductive development with precocity where the absolute fecundity was 52,123 oocytes with a synchronous spawning type in more than two groups; the reproductive period is comprised throughout the year with the highest occurrence in two moments in the months of march to june and the second of august to October. The present work reported that the species Haemulon plumierii is parasitized by monogenetic Monopisthocotylea and Polyopisthocotylea with low prevalence rates, medium intensity and average abundance, and that H. plumierii is a seasonal strategist where his reproductive tactics were not influenced by the parasitism of monogenetics in conditions of low parasitic ecological indices / Haemulon plumierii são peixes costeiros que habitam águas desde a Baía de Chesapeake - EUA, Golfo do México, Caribe e toda a costa do Brasil. Os peixes são os vertebrados aquáticos que apresentam os maiores índices de parasitismo e usam diferentes táticas reprodutivas em sua estratégia de vida para maximizar a reprodução e garantir a sobrevivência dos seus descendentes até a idade adulta. O presente trabalho verificou se o ectoparasitismo por monogenéticos pode influenciar as táticas reprodutivas de H. plumierii nas águas marinhas no Norte do Oceano Atlântico Sudoeste (4º 50’57’’S e 37º51’36’’O), próximo ao Rio Grande do Norte/Brasil, para isso, realizou-se a pesquisa parasitária de monogenéticos e o estudo das táticas reprodutivas de H. plumierii. Foram capturados 240 exemplares de hospedeiros H. plumierii no período de agosto de 2015 a julho de 2016, com amplitudes de peso total entre 84,5 a 517,5g e comprimento total de 175 a 315mm. Os Monogenéticos parasitaram 106 peixes H. plumierii entre 240 examinados, sendo coletados 162 parasitos que estavam distribuídos em duas subclasses: Monopisthocotylea e Polyopisthocotylea. Monopisthocotylea da família Capsalidae nos gêneros Encotyllabe (75 nas brânquias e 9 no tegumento) e Entobdella (1 nas brânquias e 17 no tegumento); Polyopisthocotylea na família Diclidophoridae no gênero Choricotyle (51 nas brânquias e 9 no tegumento). H. plumierii foi identificado como um novo hospedeiro para os monogenéticos Encotyllabe sp., Entobdella hipoglossi, e Choricotyle sp., sendo o primeiro registro do gênero Entobdella na família Haemulidae. Os parasitos monogenéticos apresentaram uma maior preferência parasitária pelas brânquias, apresentando baixos índices ecológicos parasitários. Determinou-se que H. plumierii são peixes estrategistas sazonais no qual os machos apresentam maior peso total, comprimento total e número em relação as fêmeas, contudo não ocorreram diferenças significativas. Registrou-se que a espécie H. plumierii possui as seguintes táticas reprodutivas: crescimento do tipo alométrico negativo indicando um incremento corporal maior em comprimento do que em peso; independente deste estádio imaturo (jovens) foi verificado macroscopicamente que os adultos possuem três estádios de desenvolvimento gonadal (em maturação, maduro e esvaziado) durante o ciclo reprodutivo; este animal alterou sua estratégia reprodutiva iniciando o desenvolvimento reprodutivo com precocidade onde a fecundidade absoluta foi de 52.123 ovócitos com um tipo de desova sincrônico em mais de dois grupos; o período reprodutivo está compreendido durante todo o ano com maior ocorrência em dois momentos nos meses de março a junho e o segundo de agosto a outubro. O presente trabalho registrou que a espécie Haemulon plumierii é parasitado por monogenéticos Monopisthocotylea e Polyopisthocotylea com baixos índices de prevalência, intensidade média e abundância média, e que H. plumierii é um estrategista sazonal onde suas táticas reprodutivas não sofreram influência pelo parasitismo de monogenéticos nas condições de baixos índices ecológicos parasitários / 2017-06-29