. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. premaxillary subopercle preopercle quadrate symplectic interhyal interopercle dentary coronomeckelian articular 1 mm Figure 14. Phenacobrycon henni. Internal view of jaws, suspensorium, and facial bones ( specimen) Relative ahundance. During our field- work in 1971 glandulocaudinos were found onl)- in large, low gradient of the Guayas basin, unlike the and more common Bryconamericus brevirostris and Astyanax festae. Of the three glandulo- eaudine genera, Fhenacohrycon 1)\' far the eommo
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. premaxillary subopercle preopercle quadrate symplectic interhyal interopercle dentary coronomeckelian articular 1 mm Figure 14. Phenacobrycon henni. Internal view of jaws, suspensorium, and facial bones ( specimen) Relative ahundance. During our field- work in 1971 glandulocaudinos were found onl)- in large, low gradient of the Guayas basin, unlike the and more common Bryconamericus brevirostris and Astyanax festae. Of the three glandulo- eaudine genera, Fhenacohrycon 1)\' far the in our A pre- ponderance of Plicnacobrycon o\er Lando- iiia also is found in the onl\' other two recorded collections: the Festa collection from the Rio Vinces, made sometime before 1895, contains 67 Phenacobrycon and 5 Landonia (r(>ported in Tortonese, 1941-42). In 1913 Ilenn obtained 15 Landonia and more than 40 PJienacol)rycon at Vinces, and 22 Landonia and "many" Phenacobry- con at C^ohnu's on the Hio Daule (Eigen- mann, 1927). Feeding habits. Th(> .specimens of lotabrycon, Phenacobrycon, and Landonia taken near Vinces in November 1971 appear to be well fed, in contrast to Bryconamericus brevirostris and Astyanax nasal pre maxillary supripreopprcle operrlc. dentary subopercle preopercle interopercle Figure 15. London/a iatidens. Lateral view of jaws, suspensorium, and facial bones ( -mm specimen). 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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