Ph.D. (Nematology) / This thesis consists of three parts: the first and major part dealing with Xiphinema species from southern Africa. the second shorter part with Xiphinema species from the Aldabra Atoll. and the last part with aspects of the ultrastructure of Xiphidorus balcarceanus Chaves & Coornans, 1984 from Argentina. Nine new Xiphinema species are described from southern Africa. The three new species X. erriae, X. ripogranum and X. lacrimaspinae are all related to X. meridianum Heyns. 1971. but can be differentiated by the nature of the uterine spines and inclusions in the pseudo-Z-organ. tail shape. ovejector shape and the presence or absence of males. Two new longtailed species related to X. fJagellicaudatum Luc, 1961. viz. X. judex and X. dracomontanum, can be distinguished by body length. tail length and shape. the nature of the pseudo-Z-organ and presence or absence of males. Three new species with digitate or subdigitate tails are described, viz. X. capriviense from South West Africa-Namibia, which is characterised i.a. by peculiar inclusions in the uterus. X. pongolense from northern Natal which is quite similar to X. umobae Heyns & Spaull, 1979. and X. simplex from the Transkei, in which the uterus is devoid of any inclusions. The last new species to be described is X. ometizulu, which belongs to the X. zulu Heyns, 1965 and X. mampara Heyns, 1979 species complex. The abovementioned species complex was studied in detail, and X. mampara was found to consist of three different forms, one amphimictic, which is herein called X. mampara f. bisexuale. and two parthenogenetic forms. called X. mampara f. major and X. mampara f. minor. Redescriptions based on new populations are given for X. clavatum Heyns, 1965 and X. imitator Heyns, 1965. and additional information is also offered for X. umobae. A dichotomous key is presented for the identification of the 54 species of Xiphinema recorded from southern Africa. and the known distribution of these species is shown in a series of maps. X. brevicolle Lordello & Da Costa. 1961. X. italiae Meyl. 1953 and X. malagasi tuc, 1973 are reported from the Aldabra Atoll. All three species are described and figured, and compared with previous descriptions. The ultrastructure of the cuticle and feeding apparatus of Xiphidorus ba/carceanus was studied and compared with some other Longidoridae species.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:uj/uj:4254 |
| Date | 10 March 2014 |
| Creators | Hutsebaut, Mieke |
| Source Sets | South African National ETD Portal |
| Detected Language | English |
| Type | Thesis |
| Rights | University of Johannesburg |
Page generated in 0.0106 seconds