Page 182 - The Freshwater Mussels of Oklahoma

Partial Synonymy:
Lampsilis parva (Barnes, 1823), Simpson 1914; Isely 1925
Corunculina parva (Barnes, 1823), Isely 1925
Carunculina parva (Barnes, 1823), Murray and Leonard 1962; Johnson 1980;
Branson 1984
Toxolasma parva (Barnes, 1823), Valentine and Stansbery 1971
Toxolasma parvus (Barnes, 1823), Oesch 1984; Turgeon and others 1988;
Williams and others 1992; Vidrine 1993; Watters 1995; Howells and
others 1996
Description:
“Shell long elliptical or subcylindrical, generally a very little wider behind,
inflated, subsolid, with full, but not high, beaks, which are turned forward over a narrow
lunule, their sculpture consisting of seven or eight single-looped ridges, which are curved
up more behind than in front, and return at the posterior end in converging lines to the
nucleus; posterior ridge wanting; epidermis thick and cloth-like, blackish or fuscous,
often brownish in the umbonal region; left valve with two compressed, ragged, recurved
pseudocardinals, and two delicate laterals; right valve with one pseudocardinal, a minute
one above it and a single lateral; beak cavities and muscle scars shallow, nacre bluish-
white, silvery and somewhat iridescent behind, slightly thickened in front. The male and
female shells are much alike, the latter being more inflated and a little fuller at the
extreme post-basal region. The male shell is usually evenly rounded behind, that of the
female is often a little truncate and sometimes has a blunt point above. The greatest
diameter is behind the center of the shell, and the female is remarkable for sometimes
having the diameter greater than the height” (Simpson 1914, p 151).
Hosts for Glochidia:
Bluegill, Green Sunfish, Orangespotted Sunfish, Warmouth, White Crappie
(Watters, 1994).
Comments:
Some populations in far southeast Oklahoma resemble and may in fact belong to
T. texasensis.

Table 35. Summary of T. parvus shell characters.

Maximum
H/L Range Mean H/L Length W/L Range Mean H/L
Location N (%) (%) (mm) (%) (%)
Red River System
Washita River Drainage 6 54.8-61.8 57.6 34 40.7-50.0 43.2
Lake Murray (Carter Co.) 20 53.6-60.0 57.3 28 37.5-47.6 43.4
Lake Texoma 10 52.0-60.0 55.9 27 35.3-48.1 41.4
Blue River 1 60.0 - 40 37.5 -
Boggy River 6 53.8-60.0 57.6 18 30.8-41.2 38.9
Kiamichi River 6 56.0-62.0 58.5 39 34.6-40.6 38.2
Glover River (Little River Dr.) 5 58.0-62.0 59.2 34 37.9-41.9 39.4
Pine Creek Res. (Little R. Dr.) 33 51.9-63.0 56.1 35 30.0-44.4 35.4
Little River 11 53.0-61.0 56.4 34 32.0-42.9 36.6
Mountain Fork River 17 55.3-64.4 59.2 37.9 32.0-42.2 36.7

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