†family Pachydiadematidae Chan et al. 2021 (barnacle)
Thecostraca - Balanomorpha - Pachydiadematidae
Full reference: B. K. K. Chan, N. Dreyer, A. S. Gale, H. Glenner, C. Ewers-Saucedo, M. Pérez-Losada, G. A. Kolbasov, K. A. Crandall, and J. T. Høeg. 2021. The evolutionary diversity of barnacles, with an updated classification of fossil and living forms. Zoological Journal of the Linnean Society 193:789-846
Parent taxon: Pachydiadematoidea according to B. K. K. Chan et al. 2021
Sister taxa: none
Subtaxa: Pachydiadema
Type: Pachydiadema
Ecology: stationary epifaunal suspension feeder
Distribution: found only at Röper lens, Ivö Klack (Cretaceous of Sweden)