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Abstract
The sessile barnacle Hexaminius venerai sp. nov. (Tetraclitoidea: Austrobalanidae) is described from the middle Eocene La Meseta Formation of Seymour Island, Antarctic Peninsula. Hexaminius venerai sp. nov. is the earliest known record of the genus in the Antarctic, the first occurrence of Hexaminius from outside Australian waters and the first record of a fossil cirripede attached to the substrate from the Antarctic. Exceptional preservation of more than 200 specimens, some of which retain opercula within the shell, is discussed. In life, the cirripedes were attached to a tree trunk tentatively identified as Podocarpoxylon, a South Hemisphere conifer. Hexaminius venerai sp. nov. is a survivor of an early phase in balanid radiation, prior to the development of strong radially-interlocked parietes.https://zoobank.org/urn:lsid:zoobank.org:pub:EAA2EB5C-BC57-41FA-93A0-046AF5FD59EB
Acknowledgements
We thank to Jan Sklenář (National Museum) for access to Camera Eos 6D and Light microscope Olympus DP70. We also thank Jakub Sakala (Charles University) for determining fossil wood. TK work was financially supported by Ministry of Culture of the Czech Republic (DKRVO 2018/06, National Museum, 00023272). RV research was funded by the Grant Agency of the Czech Republic (No. GP14-31662P). MKV research was funded by Center for Geosphere Dynamics (UNCE/SCI/006) and by the RVO 67985831 of the Institute of Geology of the Czech Academy of Sciences, v. v. i.