Abstract
Specimens of larval to early juvenile Etheostoma kennicotti and E. squamiceps were comparatively examined using meristic, morphometric, and pigment characteristics. Ova diameters of E. kennicotti ranged from 1.8-2.5 mm and those of E. squamiceps were 1.4-1.9 mm. Etheostoma kennicotti hatched at 4.1-4.7 mm TL and E. squamiceps at 5.6-6.1 mm TL. Both species have 16 preanal myomeres and 18 or 19 postanal myomeres. Etheostoma kennicotti (<13.0 mm TL) has a more spherical, larger yolk sac and a smaller head length/TL than E. squamiceps. Etheostoma squamiceps has melanophores distributed postanally, while E. kennicotti has melanophores limited primarily to the yolk sac. A preliminary diagnostic characterization of the subgenus Catonotus based on larval traits is included.
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