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(Spence Bate, 1860)

Female stage with the middle part of the body sac-like, having two or three lobes on each side; head present as a small conical projection still retaining appendages for attachment; posterior region also cone-like and with some evidence of segments particularly in maturing females. Cryptoniscus (male) with antenna 1 biramous. Female reaching 8 mm body length.

Adults in the mantle cavity of the shore barnacles Balanus balanoides , Elminius modestus , Chthamalus stellatus and Balanus perforatus .

A southern species, but recently recorded in Norway.

Hemioniscus balani