. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Paracheirodon Relationships • Weitzman and Fink 349. Figure 3. Adult live Paracheirodon innesi, female above, SL mm, male below, SL mm. Specimens not retained. Cheirodon, where it "fit" because of its single premaxillary tooth row, thus not upsetting Eigenmann's system. Gery (1960b: 9-13) examined the rela- tionships of the two neon tetras (then called Hyphessobrycon innesi and Chei- rodon axelrodi) to each other and to other small characids, especially those with one row of premaxillary teeth, gro
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Paracheirodon Relationships • Weitzman and Fink 349. Figure 3. Adult live Paracheirodon innesi, female above, SL mm, male below, SL mm. Specimens not retained. Cheirodon, where it "fit" because of its single premaxillary tooth row, thus not upsetting Eigenmann's system. Gery (1960b: 9-13) examined the rela- tionships of the two neon tetras (then called Hyphessobrycon innesi and Chei- rodon axelrodi) to each other and to other small characids, especially those with one row of premaxillary teeth, grouped as the Cheirodontinae. Gery's analysis is useful, and although to a large extent based on the concepts of generic relationships for the Cheirodontinae published by Eigen- mann (1915: 14-17), it includes several hypotheses of possible importance in any study of the phylogeny of small characi- forms. Unfortunately, his study was marred by many errors of morphological interpretation (see discussion below on uninformative characters). Gery's work also displays a few interpretive contradic- tions that in some places made the rela- tionships he proposed unclear. Because Gery's paper was an attempt to elucidate the "relationships" of many "cheirodontins," including the two neon tetras mentioned above, a review of his basic hypotheses is in order. Gery (1960b: 2-5) proposed to divide the genera of the entire subfamily into two basic groups, the first (divided by Gery at that time into three subgroups) having tricuspid or uni- cuspid teeth and the second having five or more cusps {Cheirodon and seemingly related genera). This was done despite the fact that one species of the second group,. 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. Cam
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