Juday, Chancey (ed.) / Transactions of the Wisconsin Academy of Sciences, Arts and Letters
volume XXI (1924)
Baker, Frank Collins
The fauna of the Lake Winnebago region, pp. -146 PDF (11.3 MB)
132 Wisconsin Academy of Sciences, Arts, and Letters. LIST OF MOLLUSCA UNIONIDAE Dysnomia triquetra Raf. A single small individual was dredged from the Fox River at Omro. This is the first record for Wisconsin, and the northern- most record for any locality. It occurs in southern Michigan. Lampsilis ventricosa (Barnes). Common in the Fox River at Omro and other places. Lampsilis ventricosa canadensis (Lea). Lakes Winnebago and Butte des 2dorts, abundant. Not before reported from Wisconsin. Lampsilis siliquoidea (Barnes). Common in the Fox River at Omro and ,other places. Lampsilis siliquoidea rosacea (DeKay). Lakes Butte des Morts and Winne- bago, abundant. First authentic records from Wisconsin. Ligumia recta (Lamarck). Lake Winnebago, common. The typical form lrom Lake Erie seems to be represented in the lake, where the individuals are smaller and more brightly colored and rayed than the large, black speci- mens from the rivers. Ligumia recta latissima (Raf.). Fox River at Omro and other places. The large river form. Abundant. Proptera alata (Say). Common in Lake Butte des Morts and Lake Win- nebago. As noted by Ortmann (1920) and others the Lake Erie form of alata is smaller and more swollen than the river forms and the epidermis is usually browner. The Winnebago Lake shells are of this form. Proptera alata megaptera (Raf.). Fox River and other places, common. A much larger shell with more compressed valves. Leptodea fragilis (Raf.). Omro and other places on the Fox River, abundant. Leptodea fragilis lacustris (Baker). Lakes Winnebago and Butte des Morts, common. The lake shells differ markedly from the river shells in color and form. (Baker, 1922, p. 131.) Truncila trunoata (Raf.). Omro, Fox River, common. Lake Butte des Morts, rare. Truncilla truncata (Raf.) variety. A form of truncata occurs in Lake Winnebago which is somewhat smaller than the river type of this species. The umbones are less elevated, the valves are rounder and more compressed and the posterior ridge is much less developed. Not enough material is at hand to differentiate this from the typical species. 0 Actinonaias carinata (Barnes). Omro, Fox River, common; Lake Butte des Morts, rare. Strophitus rugosus (Swainson). Omro, Fox River, rare. Strophitus rugosus (Swainson). Var. Lakes Winnebago and Butte des Morts, not common. Anodonta imbecillis Say. Omro, Fox River, common. Anodonta grandis gigantea Lea. Omro, Fox River, common. Anodonta grandis footiana Lea. Lakes Winnebago and Butte des Morts, abundant. This is the type locality for footiana.
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