Southwest Florida Shells

José H. Leal

Arcinella cornuta

Conrad, 1866

Family Chamidae

Florida Spiny Jewelbox

Shell size up to 40 mm; shell squarish, heavy, not attached to substrate. Sculpture of 7-8 strong radial rows of tubular spines. Smaller projections on interspaces between rows of spines. Lunula large, heart-shaped. Color white, internally with pink or light-purple tints.This is a relatively common species in SW Florida. As it happens with many bivalve species, whole shells, or paired valves, however, are difficult to find. Florida spiny jewelboxes show delicate and variable color patterns, and the species name derives from the hollow spines present on the shell. The complete shells shown in the supplementary photos were collected by Shell Museum friends Smoky Payson (left, found in 2016) and Jim Scatterday (right, found in 2007), on the east end of Sanibel. The shell on the right had been bored by a chimney clam, whose dwelling can be seen on the bottom part of the shell.

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