— 717 — 
was & Chaturvedi, 1963 ; Oxysomatium stomatici Bisvvas & Chaturvedi, 1963 ; Oxysomatium 
brevispiculum Yuen, 1965 ; Neoxysomatium longicaudatum Ali & llyas, 1969 ; Oxysomatium 
punctatum Walton, 1933 ; Oxysomatium minulum Rasheed, 1965, are ail shown to be syno- 
nymous with various Aplectana spp. 
The original description of Oxysomatium walloni Skrjabin, Schikhobalova & Mozgo- 
voi, 1951 [= Aplectana mexicana Walton, 1940, preoccupied ; = Aplectana waltoni (Skrja¬ 
bin, Schikhobalova & Mozgovoi, 1951) Skrjabin, Schikhobalova & Lagodovskaya, 1961] 
is inadéquate and females are not known. This species is left incertae sedis. 
The original description of Oxysomatium dogieli Skrjabin, 1916 i = Oxysoma dogieli 
Skrjabin, 1916, lapsus calami ; = Aplectana dogieli (Skrjabin, 1916) Yorke & Maplestone, 
1926] lacks details and the host (from East Africa) was identified only to the Family Bufo- 
nidae. Type specimens are not available for study. Male worins are clearly cosmocer- 
coids which belong to Aplectana, Oxysomatium, or Raillielnema. They are similar to and 
may be conspecific with Aplectana hylambalis (Baylis) or A. chamaeleonis (Baylis). Skrja¬ 
bin studied only one immature female worm which had a tail which is unusually short 
and blunt for a memher of the Cosmocercinae. The reproductive System was not descri- 
bed. Since the original description, O. dogieli lias been recorded only once from Kenya 
(Schmidt & Canaris, 1968). These specimens hâve been examined (USNM 63123) and 
they belong to A. chamaeleonis. O. dogieli is designated a species dubia. 
The type specimens of Oxysomatium tibelanum Baylis, 1927 [= Aplectana tibetanum 
(Baylis, 1927) Travassos, 1931 (2 J on a permanent slide, BM 1923.8.28.92)] are poorly pre- 
served. However, the numerous preanal papillae are rosettes and the species belongs in 
the genus Cosmocercoides. C. tibetanum (Baylis, 1927) n. comb. should be reexamined and 
compared with other Cosmocercoides spp. when well fixed specimens become available. 
The females of Oxysomatium baylisi Walton, 1923 [= Aplectana baylisi (Walton, 
1933) Lôpez-Neyra, 19471, are relatively small (2.2 mm long, width at vulva 175 pm), 
and the eggs are large (120 jj.m long). Since caudal papillae in males are simple in structure, 
the species belongs in the genus Raillielnema and it is herein designated R. baylisi (Walton, 
1933) n. comb. 
One type male (USNM 9382) of Oxysomatium georgianum Reiber, Byrd & Parker, 1940, 
lias been examined. This species is synonymous with Cosmocercoides dukae (Holl, 1928). 
A number of species originally assigned to Aplectana or synonyms of this genus hâve 
been at some time transferred to Oxysomatium. The présent studies do not support any 
of these taxonomie changes. 
Acknowledgement 
This study was supported by a NATO Postdoctoral Fellowship from the Natural Sciences 
md Engineering Council of Canada. 
REFERENCES 
Ballesteros-Mârquez, A., 1945. — Révision de la Familia Cosmocercidae Travassos, 1925. 
Revta ibér. Parasit., tomo Extraordin. : 150-180. 
Baylis, H. A., 1927. —- On two new species of Oxysomatium (Nematoda), with some remarks on 
the genus. Ann. Mag. nal. Hist., 9th Ser., 19 : 279-286. 
Source : MNHN, Paris 
