Amphidromus inversus

Amphidromus inversus is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Camaenidae.

[1] Like most members of the subgenus Amphidromus, it is chirally dimorphic: within the same populations, both dextral (clockwise-coiled) and sinistral (anticlockwise-coiled) individuals co-exist.

Among the subgenus Amphidromus, A. inversus stands out because since c. 2004, it has been the focus of studies aimed at understanding the evolution of chiral dimorphism.

Most of these studies have taken place on the Malaysian island of Kapas.

Sumatra, Peninsular Malaysia, Thailand Schilthuizen et al. (2005) described spatial structure of population of Amphidromus inversus in Malaysia.

apertural view of a shell of Amphidromus inversus
A batch of eggs of the land snail Amphidromus inversus, found in a piece of dead wood on the island of Kapas, Terengganu, Malaysia