. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 506 BiiUctin Museum of Comparative Zoology, Vol. 144, No. 8 suspensory pharyniieal basihyal dorsal hypohyal hypobranchial basibranchial \ ventral hypohyal ceratohyal epibranchial. branchiostcjjal rays 1-4 Figure 18. Landonia latidens. Lateral view of left half of hyoid (minus interhyol) and first gill arches ( specimen) Phenacohrycon and Landonia in a w('ll-ck'\x'lop(>(l rln' The re- lationsliips of cdunoid, \omcr, and lateral edimoid are as in Fhenacobr\icon. In Landonia and Fhenacoh
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 506 BiiUctin Museum of Comparative Zoology, Vol. 144, No. 8 suspensory pharyniieal basihyal dorsal hypohyal hypobranchial basibranchial \ ventral hypohyal ceratohyal epibranchial. branchiostcjjal rays 1-4 Figure 18. Landonia latidens. Lateral view of left half of hyoid (minus interhyol) and first gill arches ( specimen) Phenacohrycon and Landonia in a w('ll-ck'\x'lop(>(l rln' The re- lationsliips of cdunoid, \omcr, and lateral edimoid are as in Fhenacobr\icon. In Landonia and Fhenacohrycon die poste- riormost part of the parasphenoid provides a strong, ventrally directed, keel-like struc- ture on the base of die cranium; in lotahnj- con the posterior part of the parasphenoid is weakly developed, flattened from side to side, and fails to form a stiong \^entral keel. In lotahnjcon only the frontal and basihyal hypohyals hypobranchials accessory basibranchial. 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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