. Bulletin of the Natural History Museum Zoology. DESCRIPTION OF THREE NYBELINIA SPECIES 127. Fig. 4 Scolex of Nybelinia perideraeus sp. nov. from Glyphis gangeticus. Scale bar=150 urn. tentacular hooks by Shipley & Hornell (1906) and Pintner (1930) were not unambiguous, he added with his own illustrations given in figs 97-100 a further type of tentacular armature for N. perideraeus. He described a characteristic basal armature, where the hook form changes from rose-thorn shaped in the basal part to slender spiniform with sharply recurved tip in the metabasal part. Additionally, the size o
. Bulletin of the Natural History Museum Zoology. DESCRIPTION OF THREE NYBELINIA SPECIES 127. Fig. 4 Scolex of Nybelinia perideraeus sp. nov. from Glyphis gangeticus. Scale bar=150 urn. tentacular hooks by Shipley & Hornell (1906) and Pintner (1930) were not unambiguous, he added with his own illustrations given in figs 97-100 a further type of tentacular armature for N. perideraeus. He described a characteristic basal armature, where the hook form changes from rose-thorn shaped in the basal part to slender spiniform with sharply recurved tip in the metabasal part. Additionally, the size of the scolex illustrated, 400-500 urn, is much smaller than that given before for N. perideraeus. The illustrated specimens from C. melanoperus correspond in scolex size and morphology as well as in the detailed described tentacular armature to N. africana Dollfus, 1960 (compare Figs 97-100 in Dollfus (1942) with figs 10-19 in Dollfus (1960). Thus, we consider both sets of material to belong to the same species, N. africana Dollfus, 1960. Vijayalakshmi et al. (1996) described N. perideraeus from Scoliodon palasorrah from India with a uniform tentacular armature of minute curved hooks lOum long. The co-type material examined in the present study demonstrates that the tentacular armature of N. perideraeus is homeoacanthous heteromorphous with rose-thorn shaped tentacular hooks of the same size along the tentacle. Thus, the identity of the material described by Vijayalakshmi et al. (1996) still needs to be clarified. The measurements and figures of the co-type specimen VNHM 2109 as well as the size of the tentacular hooks correspond closely with those of N. dakari Dollfus, 1960 from the west African coast and it is therefore considered synonymous with N. perideraeus. Thus, Nybelinia perideraeus is the only species in subgrouping II Ab of Palm et al. (1997), characterized by a homeoacanthous, hetero- morphous metabasal armature without a characteristic basal armature and basal tent
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