. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Paracheirodon Relationships • Weitzman and Fink 365 18, Lisuallv iii-16 (once iv-16 and twice iv- 17), n = 34; pectoral-fin rays i-7 to i-9, usnally i-8, n = 34; pelvic-fin rays i-5 to i-6, (only one specimen with i-5), n = 34; caudal-fin rays 10/9, n = 34. No bony pel- vic-fin hooks found in mature male spec- imens. Scales cycloid. Lateral line incomplete (or absent, one specimen), perforated lat- eral-line scales 0 to 5, usually 3, n = 24; scales in a lateral series 29 to 33, usually 31, n = 25; scale rows between a
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Paracheirodon Relationships • Weitzman and Fink 365 18, Lisuallv iii-16 (once iv-16 and twice iv- 17), n = 34; pectoral-fin rays i-7 to i-9, usnally i-8, n = 34; pelvic-fin rays i-5 to i-6, (only one specimen with i-5), n = 34; caudal-fin rays 10/9, n = 34. No bony pel- vic-fin hooks found in mature male spec- imens. Scales cycloid. Lateral line incomplete (or absent, one specimen), perforated lat- eral-line scales 0 to 5, usually 3, n = 24; scales in a lateral series 29 to 33, usually 31, n = 25; scale rows between anterior dorsal-fin base and pelvic-fin base 9, n = 28; predorsal scales 9 to 10, usually 10 (9 in one specimen), n = 28; horizontal scales rows around caudal peduncle 12, n = 28. Dorsal-limb gill rakers 5 to 7, usually 6, n = 42; ventral-limb gill rakers 10 to 12, usually 11, n = 42. Total number of vertebrae including Weberian apparatus and terminal com- pound centrum 32 to 34, usually 32, n = 32. Dental Morphology. Premaxilla with two tooth rows, an inner row of four to five multicuspid teeth and an outer row of one to two conical teeth (Fig. 19A-E). Smallest specimens available to us, SL and mm, all USNM 216911, with four inner row premaxillary teeth; available specimens larger than preceding all with five. Tooth-cusp formula variable in the wild-caught specimens; representative cusp numbers 6653 [6 (median tooth), 6 (tooth lateral to median tooth), 5 (next lat- eral in series), 3 (lateral tooth)] (in a spec- imen mm SL), 67763 (SL mm), and 69865 (SL mm), USNM 216911. Note that in larger specimens two teeth immediately lateral to symphyseal tooth have greatest number of cusps. Positive correlation occurs between fish size and total number of cusps on inner-row teeth, based on our small sample of wild-caught specimens (USNM 216911), SL to mm, n == 7, X = In these speci- mens, total cusp number (added over all inner row teeth) gave re
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