. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. PB2. Figure 13. Right upper pharyngeal jaw in dorsal view. A. Geophagus; B. Micrometrus; C. Stegastes; D. Labrus. cles of two African cichlid fishes, and characters of the ventral branchial mus- culature of labroids are employed by Stiassny (1982, and in press) and Green- wood (1985). The plesiomorphic perciform configu- ration of ventral branchial muscles is rep- resented here by the arrangement in Mo- rone (Fig. 4A). Both the rectus ventralis IV and obliquus ventralis IV insert togeth- er onto a well-developed semic
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. PB2. Figure 13. Right upper pharyngeal jaw in dorsal view. A. Geophagus; B. Micrometrus; C. Stegastes; D. Labrus. cles of two African cichlid fishes, and characters of the ventral branchial mus- culature of labroids are employed by Stiassny (1982, and in press) and Green- wood (1985). The plesiomorphic perciform configu- ration of ventral branchial muscles is rep- resented here by the arrangement in Mo- rone (Fig. 4A). Both the rectus ventralis IV and obliquus ventralis IV insert togeth- er onto a well-developed semicircular lig- ament system. Among labroids a similar configuration is present in embiotocids (Fig. 4B) and most cichlids (Fig. 4C; Greenwood, 1985 and Stiassny, in press), as well as in the percoid outgroups ex- amined (Serranus lacks the semicircular ligament system entirely [Stiassny, in press]). In labrids (Fig. 4D) and pomacentrids (Fig. 4E) the rectus IV and obliquus IV muscles insert independently on the semicircular ligament. Although a seem- ingly minor distinction, these insertional differences consistently appear to differ- entiate labrids and pomacentrids from the other perciform taxa examined, and as such are interpreted as synapomorphic for the two lineages. Primitively among acanthomorphs a. 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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