Zlaa160f0009

Description:

Description: English: Timeline of Thoracican evolution. Generic diversity of the Thoracica from the latest Triassic to the present. Early forms are entirely phosphatic, followed by calcitic pedunculated forms. Balanomorphans (acorn barnacles) appeared in the Cretaceous, but they radiated only after a low-diversity period following the Cretaceous–Palaeogene (K–Pg) extinction. The diversification starting in the Neogene is still ongoing. Living genera shown include only forms with shell plates, in order to compare with the fossil record. Further explanation is given in the main text. (1) Eolepadomorpha, Eolepadidae, Eolepas; (2) Eolepadomorpha, Eolepadidae, Toarcolepas; (3) Pollicipedomorpha, Zeugmatolepadidae, Concinnalepas; (4) Archaeolepadomorpha, Archaeolepadidae, Archaeolepas; (5) Calanticomorpha, Cretiscalpellidae, Witherscalpellum; (6) Scalpelloidea, Scalpellidae, Arcoscalpellum; (7) Brachylepadomorpha, Brachylepadidae, Pycnolepas; (8) Verrucomorpha, Verrucidae, Altiverruca; (9) Balanomorpha, Catophragmidae, Catomerus; (10) Lepadoidea, Lepadidae, Lepas; (11) Neolepadomorpha, Neolepadidae, Stipilepas. Date: 25 February 2021. Source: https://academic.oup.com/zoolinnean/article/193/3/789/6149353. Author: Benny K K Chan, Niklas Dreyer, Andy S Gale, Henrik Glenner, Christine Ewers-Saucedo, Marcos Pérez-Losada, Gregory A Kolbasov, Keith A Crandall, Jens T Høeg.