. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 508 BuUitin Museum of Comparative Zoology, Vol. 144, No. 8 basihyal basibranchials hypobranchials , ventral hypohyal ⢠dorsal hypohyal accessory basibranchials suspensory pharyngeals ceratohyal epihyal upper pharyngeals lower pharyngeal. posttemporal â ceratobranchials Figure 21. Landonia latidens. Dorsal view of right half of hyoid (minus interhyal) and gill arches (branchiostegal rays removed) ( soecimen). In all three genera the lateral foramen of the exoccipital is umisiially large. Jaws (Figs. 5, 6, 11-16
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 508 BuUitin Museum of Comparative Zoology, Vol. 144, No. 8 basihyal basibranchials hypobranchials , ventral hypohyal ⢠dorsal hypohyal accessory basibranchials suspensory pharyngeals ceratohyal epihyal upper pharyngeals lower pharyngeal. posttemporal â ceratobranchials Figure 21. Landonia latidens. Dorsal view of right half of hyoid (minus interhyal) and gill arches (branchiostegal rays removed) ( soecimen). In all three genera the lateral foramen of the exoccipital is umisiially large. Jaws (Figs. 5, 6, 11-16). 'The jaws of Fhcnacohnjcon (Figs. 5, 13, 14) are similar to the jaws of Bnjconamericus and Astya- nax. The dorsal surface of the distal end of the premaxillary is notched to receive the ventral edge of the maxillary's ascend- ing process. This notch is a relatively constant feature in many Tetragonopterinae and other characids with multicuspid teeth. It is present in such generalized fonns as Brycon, Sahninus, and the African genus Alestes. In these forms the lateral wall of the notch in the premaxillaiy bone lies external to the ascending maxillar\- (as in Fig. 13 of Phenacobrycon). Landonia the notch is absent, and entire ascending limb of the maxillary lies external to the premaxillary. This can supracleithrum. 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 Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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