Order CRYPTOPHIALIDA Kolbasov, Newman & Høeg (Cited in Kolbasov, 2009)

Cryptophialida Kolbasov, Newman & Høeg in Kolbasov, 2009: 241.— Chan, Hsieh & Kolbasov 2014: 2.

Diagnosis. Mainly characterised by females having long, narrow-necked operculum, with small circular aperture and developed lateral and reinforcing bars, tongue-shaped labrum, no caudal appendages and special gastric mill at end of stomach. Rudimentary mouth cirri, thorax with one or two whip-like dorsal processes (Chan, Hsieh & Kolbasov, 2014). Posterior end of dwarf males with circular, cuticular ribs and frequently with mantle teeth; simple attachment antennules without stalk. Cypris larvae posses rudimentary thorax and thoracopods, carapace covers body incompletely. Burrow opening rounded and small.

Remarks. Cryptophialida consists of the monotypic family Cryptophialidae .