. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. PP. Figure 7. Lateral aspect of upper jaws. A, eccentricus; B. microlepis; C, hecqui; D, paradoxus. maintained in a monotypic genus because of presumed planktivorous feeding habits (Poll. 1956, p. 413) and its dentition com- posed of obtusely pointed and posteriorly recurved small teeth arranged in a single row numbering 22-45 on the upper jaw and 19-40 on the lower jaw. However, our studies on stomach contents have revealed that X. hecqui feeds predominantly on scales of cichlids. We are therefore includ- ing X. hecq
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. PP. Figure 7. Lateral aspect of upper jaws. A, eccentricus; B. microlepis; C, hecqui; D, paradoxus. maintained in a monotypic genus because of presumed planktivorous feeding habits (Poll. 1956, p. 413) and its dentition com- posed of obtusely pointed and posteriorly recurved small teeth arranged in a single row numbering 22-45 on the upper jaw and 19-40 on the lower jaw. However, our studies on stomach contents have revealed that X. hecqui feeds predominantly on scales of cichlids. We are therefore includ- ing X. hecqui into the lepidophagous trophic category. Perissodus Boulenger 1898 represents a monotypic genus; it is characterized by broad-based truncated teeth arranged in a single row numbering 18-26 and 16-18 respectively on the upper and lower jaws. Plecodus Boulenger 1898 with four spe- cies (paradoxus, elaviae, straeleni, and multidentatus) has laminar, strongly re- curved or curled teeth. In the type species, paradoxus, the teeth are arranged in a single row numbering 18-20 and 12—15 respectively on the upper and lower 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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