Revision of the coral-inhabiting genus Conopea (Cirripedia: Archaeobalanidae) with description of two new species of the genera Conopea and Acasta Author Kolbasov, Gregory A. Author Chan, Benny K. K. Author Molodtsova, Tina N. Author Achituv, Yair text Zootaxa 2016 4178 2 182 208 journal article 10.11646/zootaxa.4178.2.2 2f21df88-0bd8-43ca-8f9c-7c1e57a48c3a 1175-5326 266295 D9ABE50D-4C9A-4086-BD65-F692AF81A50E Genus Acasta Leach, 1817 Diagnosis. Archaeobalanids with shell with thin, feebly connected compartments, basal parts of rostrum and carina not elongated, radii with oblique summits, parietes solid, usually with internal longitudinal ribs, wall plates often separated by splits or windows covered by delicate membrane; basis not elongated, deeply cup-shaped, rarely flat, margin often serrated; scutum with or without external radial striation; segments of anterior ramus of cirrus IV either bearing hooks or thorns or lacking them. The genus Acasta includes of 38 epizoic species from tropical and temperate seas, inhabiting sponges, alcyonaceans and antipatharians. Type species Acasta spongites (Poli, 1791) .