Thecalia is a monotypic genus of bivalves belonging to the family Carditidae. The only species is Thecalia concamerata. T. concamerata is also known as "dead mans hands"
The species is found in Southern Africa from Port Nolloth on the West Coast to Transkei.Branch, G.M., Branch, M.L, Griffiths, C.L. and Beckley, L.E. (2010). Two Oceans: a guide to the marine life of southern Africa Struik Nature, Cape Town. page 120
The shell is small, approximately rectangular, with rough ribs radiating from the hinge The ventral edge of the shell id folded inwards to form a brood chamber.
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