South American Naiades : a Contribution to the Knowledge of the Freshwater Mussels of South America Vol. 8 No. 3
South American Naiades : a Contribution to the Knowledge of the Freshwater Mussels of South America Vol. 8 No. 3
Ortmann, A. E. (Arnold Edward), 1863-1927
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parchappi. Beaks more or less swollen, inflated, and incurved, prominent over the lunula, but only little elevated above the posterior part of the upper margin. Lunula distinct, short, elongated triangular, variable, narrower in young, broader in old specimens, where it may be half as wide as long. Epidermis dull, cloth-like. Fine and crowded, anastomosing, concentric striae are elevated as fine lamcllse, but often they are abraded. No radial sculpture visible, and there is hardly a trace of a ...radial ridge upon the posterior slope. Color of epidermis dark grayish green, without any trace of color-markings, except oc- casionally a mere indication of a dark ray upon the posterior slope. Hinge straight, or gently curved, in its posterior part. Under the beaks it curves down more or less suddenly, and then becomes straight again, or even some- what concave. The curvature of the hinge-line is quite variable, and corresponds to the varying degree of the development of the beaks. Pseudocardinal teeth as in M.
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