Thalassematidae is a family of spoonworms in the suborder Echiurida.
Genera The World Register of Marine Species includes these genera in this family:-
Anelassorhynchus Annandale, 1922 Arhynchite Satô, 1937 Ikedosoma Bock, 1942 Lissomyema Fisher, 1946 Listriolobus Fischer, 1926 Ochetostoma Rüppell & Leuckart, 1828 Thalassema Pallas, 1774
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