Family BATHYLASMATIDAE Newman & Ross, 1971

Bathylasmatidae Newman & Ross, 1971: 138 (part.). - Newman and Ross 1976: 37, 45 (part.).

Bathylasmatinae Newman & Ross, 1976: 37, 45. - Buckeridge 1983: 68. - Newman 1996: 502. - Buckeridge 1999: 522. - Jones 2000: 231, tables 1, 2.

Diagnosis.

Shell with four or six plates; wall solid or permeated by single row of chitin-filled longitudinal canals; radii absent; one or both rami of cirri I and cirri II sometimes antenniform; labrum without notch in crest.