. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 242 Bulletin Museum of Comparative Zoology, Vol. 140, No. 5 Figure 44. Dendrogram of probable species relationships in the genus Peprilus. The evolutionary steps which increase character-state codes for each character are shown as lines across the branches. The number of the character repre- sented is next to the horizontal line and corresponds to one of the list of characters in Tables 24 and 25. Explana- tion in text. and neither seems to represent as yet a major evolutionary shift. The presence of the row o
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 242 Bulletin Museum of Comparative Zoology, Vol. 140, No. 5 Figure 44. Dendrogram of probable species relationships in the genus Peprilus. The evolutionary steps which increase character-state codes for each character are shown as lines across the branches. The number of the character repre- sented is next to the horizontal line and corresponds to one of the list of characters in Tables 24 and 25. Explana- tion in text. and neither seems to represent as yet a major evolutionary shift. The presence of the row of pores has been used as a generic character; however, it does not appear to be specially innervated, but rather to be a slight elaboration of the subdermal canal system which is present in all the members of the genus. P. ovatus (Fig. 10) frequently has a series of medium-sized, irregularly-spaced pores along the dorsal surface of the body, a somewhat intermediate condition. Regard- ing the premaxillary teeth, two other members of the elongate species group, P. snyderi and P. simillimus, generally have pointed premaxillary teeth, but a particular specimen of either species may have a few teeth with two or three small cusps, an intermediate condition. In other aspects of morphology and ecology P. ttiacanthus and P. burti have strong affinities with the other members of the genus. As Cain (1956) has stated, the genus is not necessarily definable by one peculiar attribute, nor are its constituents mono- typic, equivalent, essentially merely sub- divisions of it, or themselves wholly dis- crete. Inclusion of the seven stromateid species within a single genus appears to be a natural and instructive classification consistent with the evolutionary, morpho- logical, and distributional characteristics of the members. Intra gene ric relationships. A dendro- gram of species relationships in the genus Peprilus is presented in Figure 44. The dendrogram fits the definition given by Mayr, Li
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