Genus Dactylocalyx Stutchbury, 1841

Diagnosis. Dactylocalycidae with thick walls composed of dense network of irregularly branching and anastomosing tubules of small caliber (1 mm diameter), completely penetrating body wall and opening on both surfaces; body wall incompletely penetrated by deep round or oval holes or longitudinally oriented grooves 2-10 mm wide (Reiswig 2002a).