. Breviora. 1970 AMAZONIAN CYPRINODONT FISH 13 mesethmoid prefrontal parasphenoid pterosphenoid dermosphenotic sphenotic sphenotic socket for hyomandibular pterotic socket for hyomandibular. pterotic basioccipital' â -â -â. ^ exoccipital Fig. 4. Ventral view of cranium, specimen. only by lacrimal, preopercle and dermosphenotic bones. The very large eye is apparently unassociated with any radical modifications or displacements of bones. Subopercle very large, forming entire posterior margin of gill cover. Upper arm of subopercle termi- nating in a weak flange forming dorsal margin of an
. Breviora. 1970 AMAZONIAN CYPRINODONT FISH 13 mesethmoid prefrontal parasphenoid pterosphenoid dermosphenotic sphenotic sphenotic socket for hyomandibular pterotic socket for hyomandibular. pterotic basioccipital' â -â -â. ^ exoccipital Fig. 4. Ventral view of cranium, specimen. only by lacrimal, preopercle and dermosphenotic bones. The very large eye is apparently unassociated with any radical modifications or displacements of bones. Subopercle very large, forming entire posterior margin of gill cover. Upper arm of subopercle termi- nating in a weak flange forming dorsal margin of an externally visible concavity in opercular margin just below dorsal origin of gill slit. Lower arm of subopercle with a strong, dorsally-directed flange lying between opercle and interopercle. Interopercle rery elongate. Jaws and jaw suspension (Figs. 6, 7). The jaws do not differ from what one would expect in a small, surface- or near-sur;ace- feeding, insectivorous cyprinodont. Premaxillaries moderately pro-. 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. , Museum of Comparative Zoology, Harvard University
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