First fossil representative of Cerylonidae (Coleoptera: Coccinelloidea) described using X-ray micro-computed tomography, from Eocene Baltic amber Author Bukejs, Andris Institute of Life Sciences and Technologies, Daugavpils University, Vienîbas 13, Daugavpils, LV- 5401, Latvia. Author Ślipiński, Adam Australian National Insect Collection, CSIRO, Canberra ACT 2601, Australia. Author Mitchell, Jerit L. Physics Department, University of Regina, Regina, SK, S 4 S 0 A 2, Canada. Author Mckellar, Ryan C. Royal Saskatchewan Museum, 2445 Albert St., Regina, SK, S 4 P 4 W 7, Canada. & Biology Department, University of Regina, Regina, SK, S 4 S 0 A 2, Canada. & Department of Ecology & Evolutionary Biology, University of Kansas, Lawrence, Kansas, 66045, USA Author Bi, Mauricio Bar- Physics Department, University of Regina, Regina, SK, S 4 S 0 A 2, Canada. Author Larsson, Hans C. E. Redpath Museum, McGill University, Montréal, QC, H 3 A 0 C 4, Canada. Author Alekseev, Vitalii I. 0000-0003-4390-5443 Shirshov Institute of Oceanology, Russian Academy of Sciences, Nahimovskiy prospekt 36, Moscow, 117997, Russia. alekseew 0802 @ yahoo. com; https: // orcid. org / 0000 - 0003 - 4390 - 5443 & Kaliningrad Regional Amber Museum, Marshal Vasilevskii square 1, Kaliningrad, 236016, Russia. & Institute of Living Systems, Immanuel Kant Baltic Federal University, Nevskogo street 14, Kaliningrad, 236016, Russia. * Corresponding author. carabidae @ inbox. lv; https: // orcid. org / 0000 - 0001 - 7165 - 3023 alekseew0802@yahoo.com text Zootaxa 2021 2021-09-07 5032 2 225 236 journal article 10.11646/zootaxa.5032.2.4 1175-5326 5487322 CC4A16A2-969B-4BF9-B01E-AC0AC91258B3 Genus Protostomopsis Bukejs, Ślipiński et Alekseev gen. nov. http://zoobank.org/ urn:lsid:zoobank.org:act: 36D07141-972D-48BB-98F5-A404DA1D7015 Type species: Protostomopsis pandema Bukejs, Ślipiński et Alekseev sp. nov. , by present designation. Diagnosis. Protostomopsis gen. nov. can easily be distinguished from Ostomopsis Scott, 1922 in having antenna with 11 antennomeres and two terminal antennomeres forming loose antennal club (decamerous with club composed of fused antennomeres 10 and 11, with distinct constriction bearing peculiar sensillum in Ostomopsis ), and the elytron bearing 10 rows of punctures (8 or 9 in Ostomopsis ). Etymology. The new genus-group name Protostomopsis is composed of the ancient Greek prefix “proto-” (meaning “first”, “prior to”, “before”) and the genus name “ Ostomopsis ”. The gender is feminine.