. Bulletin of the British Museum (Natural History). OSTEOGLOSSOMORPH HYOID MUSCULARE 21 Xenotnystus nigri (Gunther) (Text-fig. iH) In all major details the musculature of this species is like that of Papyrocranus afer. The most noticeable differences may be listed briefly. Posterior intermandibitlaris. The origin is mainly from the ceratohyal, with only about one quarter stemming from the first branchiostegal ray. It inserts through a single broad head, an arrangement possibly correlated with the much weaker and rather ill-defined anterior intermanibularis in this species. As in Papyrocranus t
. Bulletin of the British Museum (Natural History). OSTEOGLOSSOMORPH HYOID MUSCULARE 21 Xenotnystus nigri (Gunther) (Text-fig. iH) In all major details the musculature of this species is like that of Papyrocranus afer. The most noticeable differences may be listed briefly. Posterior intermandibitlaris. The origin is mainly from the ceratohyal, with only about one quarter stemming from the first branchiostegal ray. It inserts through a single broad head, an arrangement possibly correlated with the much weaker and rather ill-defined anterior intermanibularis in this species. As in Papyrocranus the posterior and anterior intermandibulares are innervated by a branch of the mandi- bular V nerve. Hyohyoideus. The inferior divisions fuse in the midline before inserting onto the hypohyals. Interhyoideiis: in this species is a pair of undivided muscles fused anteroventrally, and inserting onto the hypohyals through a short tendon which wraps around the face of these bones. Cbl Hbl Hpic BhTp. LUh TSH Ch(left) Fig. 9. Papyrocranus afer: lateral view of gill arch muscles and stemohyoideus. The anterior part of the sternohyoid has been dissected away on the right side to show the embedded urohyal. The tendon (TSH) inserts onto the right ceratohyal (removed) and right hypohyal (partly removed).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). London : BM(NH)
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