Pterobranchia - Acanthastida

Ranked as a "group," a non-phylogenetic grade of unknown affinity to other graptoliths

Parent taxon: Graptolithina according to O. M. B. Bulman 1970

Sister taxa: Ascograptus, Camaroidea, Ceramograptus, Crinocaulis, Crustoidea, Cyclograptidae, Dendroidea, Diplograptoidea, Dithecodendridae, Dithecodendrum, Dithecoidea, Graptoblasti, Graptolithus, Graptoloida, Graptoloidea, Graptovermida, Leveillites, Limpidograptus, Palmatophycus, Pilograptus, Rhabdopleuridae, Siryngotaenia, Stolonoidea, Thamnograptus, Trigonograptus, Tuboidea, Wimanicrustidae

Subtaxa: Acanthastus

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Ecology: passively mobile planktonic suspension feeder

Distribution: there are no occurrences of Acanthastida in the database

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