. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 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 th
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 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. basibranchials ceratohyal epihyal epibranchial suspensory pharyngeals lower pharyngeal pterotic branches of the cephalic laterosen- sory system develop bony canals. The pterotic canal is short, and the frontal canal fails to develop a parietal branch. Parietal canal absent. In all three genera the ventral part of the orbitosphenoid has a posteriorly di- rected process. This process is relatively weak in Landonia. In Phenacohrycon and lotaJmjcon the vertical laminar portion of the supra- occipital is fenestrated. basihyal. accessory basibranchial B R basibranchials hypobranchials ,hypohyals ceratohyal epihyal suspensory pharyngeals upper pharyngeals lower pharyngeal. 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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