Hemphillia malonei (Pilsbry, 1917) Malone Jumping-slug

Arionidae, Stylommatophora, Gastropoda, Mollusca, Animalia

Range: From elevation near sea level to 1300 m; known from Puget Sound lowlands, southern Olympic Peninsula, and both the Coast and Cascade Ranges


Description: Up to 70 mm extended length while in movement; sole cream-colored to yellowish tan; in the Cascade Range, most specimens are tan/brown with dark brown spots on mantle, while in the Coast Ranges specimens may be yellow, or light brown with or without darker markings on the mantle; dorso-lateral ridges (composed of concentrations of bumps) are often present on the mantle; tail compressed laterally and with a keel.

Natural History: probably takes two years to reach maturity; occurs in moist coniferous and deciduous forest habitats. Hemphillia malonei and H. dromedarius appear to have complementary ranges; most commonly found on or under woody debris, also on skunk cabbage leaves in spring

Conservation Status:

Literature Cited:

Hanham, A.W. 1926. Hemphillia malonei Van. The Nautilus 39:143–144.

LEONARD WP, JORGENSEN K, OVASKA K, HALLOCK L. In Prep. Observations On The Reproduction, Development And Growth Of The Malone Jumping-Slug, Hemphillia Malonei Pilsbry, 1917 (Sylommatophora: Arionidae).