Prophysaon dubium (Cockerell, 1890) Papillose Taildropper

Styllomatophora, Arionidae, Gastropoda, Mollusca, Animalia

Mature specimens 8 to 24 mm in extended length when alive; dorsal base color includes various shades of brown, reddish-brown, olive, and gray; mantle always mottled to some extent by areas of brown or gray pigment, which on some specimens merges to form broad, dark stripes; foot and to lesser extent the mantle, marked by light brown, orange, copper, and/or gold flecking; sole gray or cream; translucent eggs are deposited in small clusters (6 to 14 eggs); eggs measure approximately 1.3 x 1.2 mm diameter shortly after being laid and 2.1 x 1.5 mm 10 weeks later; known from mountain passes in Cascade Range to near sea level around Puget Sound; found in both conifer and mixed forests under woody debris and in bigleaf maple leaf litter; surface activity mainly in late fall and early winter after first frost; probably an annual species; diet includes fungi (spores and hyphae), vascular plants (roots and greens), lichens, and mold

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