Page 66 - The Freshwater Mussels of Oklahoma

Partial Synonymy:
Lampsilis radiata luteola (Lamarck, 1819), Valentine and Stansbery 1971
Lampsilis hydiana (I. Lea, 1838), Simpson 1914; Isely 1925; Johnson 1980;
Branson 1984; Turgeon and others 1988; Vidrine 1993
Description:
“Shell of moderate size, normally subsolid but sometimes rather thin, long
elliptical, ordinarily much inflated; beaks full and high, their sculpture delicate,
consisting of faint, somewhat corrugated double loops, the hinder open behind; surface
smooth and shining, sometimes faintly concentrically sculptured, greenish, waxy-yellow,
beautifully and boldly rayed with green. In some cases the rays are broad and very
distinct, in others they are split into numerous fine rays with a wider ray of the ground
color between them. Occasional shells are scarcely rayed at all. Left valve bearing two
sharp, sometimes slightly compressed pseudocardinals, and after having a small anterior
lamellar third tooth near the edge of the shell; right valve with two pseudocardinals, the
lower the larger; laterals curved, one in the right valve and two in the left; anterior muscle
scars well marked; posterior scars faint; nacre generally rich silvery, though sometimes
bluish and lurid brown in the cavity of the beaks. The male shell is somewhat pointed
behind about midway up from the base; that of the female is rather blunt behind and
decidedly swollen at the post-base” (Simpson 1914, p66-67).
General Distribution:
Lower Mississippi River drainage and adjacent Gulf of Mexico drainages from
the Amite River to the Guadalupe River.
Comments:
Confined to SE Oklahoma. Blue River populations are distinct.

Table 9. Summary of L. hydiana shell characters.

Maximum
H/L Range Mean H/L Length W/L Range Mean W/L
Location N (%) (%) (mm) (%) (%)
Red River System
Blue River 22 54.8-63.0 58.8 83 33.9-43.1 37.8
Muddy Boggy River 1 65.7 - 67 46.3 -
Atoka Reservoir 3 57.6-60.0 58.6 33 33.3-38.7 36.2
Delaware Creek 3 56.3-57.1 56.7 67 38.1-40.3 39.2
Kiamichi River 25 54.3-65.4 59.5 90 29.8-49.2 39.5
Little River 15 53.3-65.0 58.9 86 37.5-51.6 44.6
Glover River 7 51.2-61.2 56.3 84 33.3-45.6 39.6

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