''Thecalia'' is a
monotypic genus
In biology, a monotypic taxon is a taxonomic group (taxon) that contains only one immediately subordinate taxon. A monotypic species is one that does not include subspecies or smaller, infraspecific taxa. In the case of genera, the term "unispe ...
of
bivalves
Bivalvia () or bivalves, in previous centuries referred to as the Lamellibranchiata and Pelecypoda, is a class of aquatic molluscs (marine and freshwater) that have laterally compressed soft bodies enclosed by a calcified exoskeleton consis ...
belonging to the family
Carditidae
Carditidae is a family of marine bivalve clams of the order Carditida, which was long included in the Venerida. They are the type taxon of the superfamily Carditoidea.
Carditidae is a neglected and poorly classified family. It has six ...
. 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.
References
{{Taxonbar, from1=Q18588631, from2=Q14480724
Carditidae
Monotypic bivalve genera