Subfamily Acastinae Kolbasov 1993 (barnacle)
Thecostraca - Balanomorpha - Balanidae
Parent taxon: Balanidae according to B. K. K. Chan et al. 2021
Sister taxa: Amphibalaninae, Archaeobalaninae, Balaninae, Bryozobiinae, Cetolepas, Concavinae, Creusiinae, Emersoninae, Hexacreusiinae, Megabalaninae, Semibalaninae, Wanellinae
Subtaxa: Acasta Archiacasta Euacasta Neoacasta Pectinoacasta
Type: Acasta
Ecology: stationary epifaunal suspension feeder
Distribution: found only at Gurlarn (Miocene of Germany)