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Featured Shellfish - Left-handed Turid

 Featured Shellfish December 2009

Left-handed Turrid - Antiplanes perversa

Left-handed turrids, aka "perverse whelks" have a rare trait among gastropods (snails). Their shells are "sinistral" meaning that they turn counterclockwise.

overview
Common Dogwhelk and Left-handed turrid

Snails with hands?

Most all snails coil clockwise as seen in the common dogwhelk , Nucella lamelossa.

perverse whelk and wrinkeled dogwinkle
Left-handed turrid and Wrinkeled Dogwinkle
green topsnail
Green topsnail

The right way to turn?

This green topsnail shows the far more common clockwise (or dextral) coiling.

Green topsnail
Green topsnail

Capable of creating nuclear whorl

The first whorl of a snail is refererred to as the "Nuclear whorl", many snails, such as the dogwhelk lay eggs with "crawl away" larvae.

Dogwhelk
Dogwhelk
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