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Carlgren, 1932

Thenaria with the base forming a well-defined adherent disc with a limbus; more than 36 tentacles in adults; mesenteries arranged normally - in regular cycles cent pairs, not divided into macrocnemes and microcnemes; acontia absent. Sphincter muscle mesogloeal. Column smooth or bearing solid tubercles, never with hollow verrucae.

Family Actinostolidae