A Guide for Terrestrial Gastropod Identification - University of ...

Annulariidae
Kathryn E. Perez, Duke University
The single U.S. species of Annulariidae is a calciphile. Hubricht (1985) states it is found
crawling on rocks and tree trunks in wet weather. Elongate, 10-12 mm long, operculate, related
to Cuban Chondropoma species.
TAXON AUTHOR
Chondropoma dentatum (Say, 1825) G2G3 FL
G-
RANK DISTRIBUTION
Arionidae (former family)
Megan E. Paustian, University of Maryland
There are 28 species (10 genera) that are native to the western U.S and Canada.
The family Arionidae was recently reclassified, such that the Eurasian subfamily
Arioninae now takes the name Arionidae, and the remaining three subfamilies are raised to
family status (below). All species are slugs. Most have a pneumostome in the anterior half of
the mantle, a wide foot fringe, a ribbed jaw, and an epiphallus.
The Anadenidae are 30-100 mm long. Prophysaon (taildropper slugs) are characterised
by a tail constriction, visible as a dark line on the sole, where a portion of the tail can break off
(autotomize) to distract predators.
The Ariolimacidae includes some diverse slug species. Ariolimax (bananaslugs) are
famously large slugs that are 100-260 mm long and that have a variably colorful (yellow, olive,
or brown) and often spotted mantle. A prominent keel runs centrally along the dorsum, and the
pneumostome is located in the posterior half of mantle (RGF, 2004). Hesperarion
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