Cirripedia Burmeister, 1834

Yu, Meng-Chen, Chan, Benny K. K., Achituv, Yair & Kolbasov, Gregory A., 2017, Four new sponge-inhabiting barnacles of the genus Acasta (Thoracica: Archaeobalanidae: Acastinae) from the Indo-Pacific, Raffles Bulletin of Zoology 65, pp. 585-615 : 586

Subclass Cirripedia Burmeister, 1834 Superorder Thoracica Darwin, 1854

Order Sessilia Lamarck, 1818 Suborder Balanomorpha Pilsbry, 1916 Superfamily Balanoidea Leach, 1817 Family Archaeobalanidae Newman & Ross, 1976 Subfamily Acastinae Kolbasov, 1993

Acasta Leach, 1817

Diagnosis. Acastinae with thin shell and feebly connected compartments, even with other wall plates; basal parts of rostrum and carina not elongated; radii with oblique summits; parietes solid with external spines, bumps, or holes, usually with internal longitudinal ribs; wall plates often separated by slits or windows covered by delicate chitinous membrane; basis calcareous, rarely membranous with calcareous inclusions, round, deeply cup-shaped, rarely flat, margin often serrated; annuli of anterior ramus of cirrus IV often with hooks or spines. The genus Acasta comprises 43 epizoic extant species from tropical and temperate seas, inhabiting sponges, alcyonaceans and antipatharians. Type species Acasta spongites ( Poli 1791 in Poli & Delle Chiaie, 1791).