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Abstract

Larval myomere counts of Nocomis platyrhynchus were made using a dissecting light microscope equipped with polarizing filters, and then compared to those of the three other species of Nocomis (Nocomis leptocephalus, Nocomis micropogon, and Nocomis raneyi) found in Virginia. Average preanal myomere counts for N. platyrhynchus (26.9) were significantly different from those of the other three species (N. raneyi =28.7; N. micropogon =26.0; and N. leptocephalus =25.9). This is especially important as larvae of N. leptocephalus, the only other species of Nocomis syntopic with N. platyrhynchus in the upper New River drainage, can now be distinguished from those of N. platyrhynchus. Larvae of N. raneyi also can be distinguished from those of other species of Nocomisin Virginia based on preanal myomere counts. However, larvae of N. platyrhynchus and N. raneyi cannot be distinguished from each other based on total myomeres (42.0 versus 41.7). Larvae of N. platyrhynchus can be distinguished from those of three of its nest associates (Lythrurus ardens, Notropis rubellus, and Phoxinus oreas), but not from Campostoma anomalum and Luxilus chrysocephalus using myomere counts.

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