Prophysaon andersonii
Prophysaon andersonii, common name the reticulate taildropper, is a species of air-breathing land slug, a terrestrial pulmonate gastropod mollusk in the family Ariolimacidae endemic to Western North America.
These slugs are notable for being able to self-amputate a portion of their tail.
Description
Adults of this slug species are about 50 mm when active, but can exceed 60 mm in length. The color of the body is a grayish or reddish brown, or can be yellowish. The dorsum is furrowed with a reticulated pattern like a mesh of diamond shapes. The mantle of the slug has two dark lateral bands. The mucus is yellow or orange.One of the most common colorations found is generally a grey coloration, mostly found off the coast.
This species does not have any dark bands on the foot of the slug, only reticulation.
The slugs are more brown as you go inland towards california.
this species can also be distinguished by male Genetalia, which are always smaller than the muscular body of the epiphallus. This is generally not used due to the distinctive reticulated pattern of this slug.