. Bulletin of the Natural History Museum Zoology. . Fig. 42-44 H. yamagutii. Strobila 4-5 cm (42) and 7-8 cm (43) behind scolex, and last proglottids (44). Scale bar=500(jm. BMNH , , ^, M. beveridgei was described in detail by Palm et al. (1997). 17. Mixonybelinia southwelli (Palm & Walter, 1999) comb. nov. Material examined. The Natural History Museum London: BMNH , M. southwelli was described in detail by Southwell (1929) and Palm & Walter (1999). DISCUSSION Of the material deposited at the British Museum Natural
. Bulletin of the Natural History Museum Zoology. . Fig. 42-44 H. yamagutii. Strobila 4-5 cm (42) and 7-8 cm (43) behind scolex, and last proglottids (44). Scale bar=500(jm. BMNH , , ^, M. beveridgei was described in detail by Palm et al. (1997). 17. Mixonybelinia southwelli (Palm & Walter, 1999) comb. nov. Material examined. The Natural History Museum London: BMNH , M. southwelli was described in detail by Southwell (1929) and Palm & Walter (1999). DISCUSSION Of the material deposited at the British Museum Natural History, 17 different trypanorhynch species, formerly all belonging to the genus Nybelinia Poche, 1926, were identified. In addition, two new gen- era, Heteronybelinia gen. nov. and Mixonybelinia gen. nov., are erected, and 4 new species, N. sakanariae sp. nov., N. schmidti sp. nov., H. heteromorphi sp. nov., and H. minima sp. nov., are de- scribed. The new genera separate species with a homeoacanthous, homeomorphous (Nybelinia) from those having a homeoacanthous, heteromorphous metabasal armature with heteromorphous basal hooks {Heteronybelinia gen. nov.) and from species with a heteromophous metabasal and homeomorphous basal armature, which are assigned to Mixonybelinia gen. nov. Mixonybelinia is a tentaculariid genus in which two different armature types occur along the tentacle. This has been described earlier for non- tentaculariid trypanorhynchs, such as the mixodigmatid Mixodigma leptaleum Dailey & Vogelbein, 1982 and the lacistorhynchid Dasyrhynchus talismani, Dollfus, 1935 (Dailey & Vogelbein, 1982; Beveridge & Campbell, 1993) After a first subdivision of the genus by Dollfus (1960), Palm et al. (1997) recently subdivided the different Nybelinia species on the basis of the tentacular armature and discussed the erection of subgenera. However, the authors did not split the genus into several genera or subgenera. The material in the Natural History Museum cle
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