Monogeneric protostome families

Echiuridae is a family of spoon worms in the suborder Echiurida. It is a monotypic family, the only genus being Echiurus. These worms burrow into soft sediment on the seabed.

Pectinatellidae is a monotypic family of freshwater bryozoans belonging to the class Phylactolaemata. Like most bryozoans, they are colonial and filter feeding organisms. These organisms lack a calcareous exterior, instead forming gelatinous colonies.

Eukrohniidae is a family of sagittoideans in the order Phragmophora. It consists of a single genus, Eukrohnia von Ritter-Záhony, 1909.

REDIRECT Mesotardigrada

REDIRECT Rastrognathia

REDIRECT Symbion

REDIRECT Leucochloridium

REDIRECT Salinella

REDIRECT Paucidentula

REDIRECT Problognathia

REDIRECT Chlidonia

REDIRECT Pelmatosphaera

REDIRECT Dendronucleata

REDIRECT Cateria

REDIRECT Apororhynchus