The evolutionary diversity of barnacles, with an updated classification of fossil and living forms Author Chan, Benny K. K. Author Dreyer, Niklas Author Gale, Andy S. Author Glenner, Henrik Author Ewers-Saucedo, Christine Author Pérez-Losada, Marcos Author Kolbasov, Gregory A. Author Crandall, Keith A. Author Høeg, Jens T. text Zoological Journal of the Linnean Society 2021 2021-02-25 193 789 846 journal article 3656 10.1093/zoolinnean/zlaa160 40324061-d8e8-4cfa-9151-4d7b110cff12 0024-4082 5637275 A77C1793-B652-41CE-BB27-CD2E29DEB201 SUBCLASS ASCOTHORACIDA LACAZE- DUTHIERS, 1880 Diagnosis: Bivalved crustaceans, with diverticula of midgut and gonads in carapace. Body generally with 11 free trunk segments, first six with biramous thoracopods, seventh with biramous or uniramous penis in both sexes (vestigial in females), last with moveable unsegmented furcal rami. Antennules four- to six-segmented, with claw guard and claw on terminal segment. Conical labrum surrounds piercing mouthparts. Parasites of echinoderms and anthozoans. Comment: Grygier (1987a) provided a comprehensive review on the taxonomy of the Ascothoracida .