Key to the Genera of Ohio Leuctridae Nymphs
(Modified from Steward and Stark, 2002; and Harper and Hynes, 1971)
Note: Suitable larval characters are available for only 7 of the known species in this family.
1. Pronotum with tufts of 4-8 bristles on corners (Fig. 2.7.1); with or without posterior hair fringe on
Ab segments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Pronotum without long marginal bristles on pronotum (there may be short ones along margin); no posterior hair fringe on Ab
segments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Ab terga and sterna with posterior hair fringe and numerous short surface hairs (Fig. 2.7.3);
paraprocts with pair of long apical bristles (Fig. 2.7.4); Ab 1-4 divided by ventrolateral membrane (Fig. 2.7.5); mesosternal Y- arms with normal single stem (Fig. 2.7.6); body usually light brown with faint
pattern (Fig. 2.7.7); scraper of mandible pectinate; labial palps longer, reaching well beyond the
tips of the paraglossae (Fig. 2.7.9); abdomen covered, at least in part, with short and stout
bristles (Fig. 2.7.10); subanal lobes baring many short and a couple of long bristles (Fig. 2.7.11); Ab 1-4
separated by a pleural fold (Fig. 2.7.12) . . . . . . . . . . . Leuctra
Ab terga and sterna without posterior hair fringe or short surface hairs (Fig. 2.7.13); scraper of
mandible bladelike, without distinct teeth (Fig. 2.7.14); paraprocts sometimes fringed with hairs
but without a pair of long apical bristles (Fig. 2.7.15); Ab 1-6 divided by ventrolateral membrane (Fig. 2.7.16);
mesosternal Y-arms with double stem (Fig. 2.7.17); body usually distinctly patterned (Fig.2.7.13); labial palps
short, barely reaching beyond the tips of the paraglossae (Fig. 2.7.14); abdomen glabrous except
for a few inconspicuous posterolateral hairs (Fig. 2.7.13); subanal lobes bare (Fig. 27.15); abdominal
segmented by a pleural fold (Fig. 2.7.16). One species in this genus in Ohio. . . . . . . . . . . . . . . . . . . . . Paraleuctra, Paraleuctra sara
