Ohio Mayflies

1.         Tusks narrowing abruptly along out margin basad of midlength of tusk (Fig. 2.3.1); elongate             narrow spine produced apically on inner margin of foretibiae (Fig. 2.3.2); mature body             typically relatively short, 9-11 mm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

            Tusks not as above, gradually and evenly attenuating to apex, with unwavering outer margin             or with only slight waver of continuous line of outer margin slightly basad of midlength             (Fig. 2.3.3); inner margin of foretibiae produce into acute process but never into long sharp             spine as above; mature body typically relatively long 13-18 mm. . . . . . . . . . . . . . . . . . . . 2

2.         Upper (forward or outward) face of femor without hairlike setae (Fig. 2.3.4); pronotum with             well-developed lateral flange and with anterolateral corner produced into short spine. . . . .             . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Anthropotamus myops

            Upper (forward or outward) face of femora with scattered hairlike setae, with degree of             hairiness varying; pronotum usually with only moderately developed lateral flange (sometimes             more developed) and with anterolateral corner not produced into short spine, although corner             itself often acute (Fig. 2.3.4). . . . . . . . . . . . . . . . . . . . . . . . . Anthropotamus distinctus

3.         Dorsal abdomiinal pale markings minimal or lacking, with pairs of small male spots             sometimes present on some terga, and narrow mid-longitudinal stripe often present and             sometimes faint or absent; tusks (outer straight-line length visible in dorsal view of head)             about as long as, or slightly longer than, midlength of head. . . . . . Anthopotamus verticis

            Dorsal abdominal pale markings more extensive, including large submedian paired spotting             and lightening at anterior and posterior margins of most terga (Fig. 2.3.5), mid-longitudinal             stripe present or absent; tusks (outer straight-line length visible in dorsal view of head)             usually slightly shorter than head (Fig. 2.3.6). . . . . . . . . . . . . . Anthopotamus neglectus

Key to Ohio Anthropotamus
Nymph Species

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