Ilyocryptid is an incomplete molting species, few case molting is complete. Body shape is triangular-ovoid, trapezium-ovoid or semi-ovoid, relatively high body in the posterior part of the body, the maximum width of the body is in the mid-dorsal or dorsal portion of the valves. Marginal setae of valves are numerous, located along the free valve margins. Head small and triangular in lateral view, covered by the headshield. The eye is large and ocellus is present near the base of antennule. Antennule is 2-segments, a unique trait with a shorter proximal segment. In all ilyocryptids, the antennule is long in comparison with anomopod standards. Antenna is 2-branches with exopod of 4-segments and endopod of 3-segments. Swimming setae formula 0-0-0-3/1-1-3. Six pairs of thoracic limbs. Postabdomen is large and wide, dorsal margin arched and broadly round, a row of large lateral setae. Postabdominal claw is long (Kotov and Štifter, 2006; Tiang-nga, 2019).

สกุล Ilyocryptus

 

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