Dana, 1853
Small to large animals (9-150 mm). Body elongate to needle-like (Calamorhynchus pellucidus 1). Head with pointed rostrum, which may be very long; sometimes with distinct neck (Cranocephalus scleroticus 1). Eyes large, occupying main part of head surface except neck and rostrum. ANT II absent in female. MD with palp in male, without in female. Maxillae I and II completely absent. Coxae usually free, sometimes fused with pereonites. P I and II chelate or subchelate, P I rarely simple. P VII usually with full number of ART, sometimes a few distal ART reduced. In females gills and oostegites both forming marsupium.
Eight genera, 7 in the South Atlantic:
Genus Calamorhynchus Streets, 1878
Genus Cranocephalus Bovallius, 1890
Genus Glossocephalus Bovallius, 1887
Genus Leptocotis Streets, 1877
Genus Oxycephalus Milne-Edwards, 1830
Genus Rhabdosoma White, 1847
Genus Streetsia Stebbing, 1888