Silurian trilobites from Scandinavia

• Main Author: Helbert, Gregory James
• Format: Thesis
• Language: English
• Published: 1985
• Subjects: QE Geology; Greenland; Norway
• Online Access: https://eprints.keele.ac.uk/id/eprint/7357/; https://eprints.keele.ac.uk/id/eprint/7357/1/HelbertPhD1985.pdf

Trilobites of the family Lichidae are described from the Silurian of Gotland, Sweden. Nineteen species (fourteen of which are named, two new) are assigned to Acanthopyge, Choneiliobarges, Craspedarges, Dicranopeltis, Lichas, Platylichas and Pseudotupolichas. Trimerolichas Phleger, 1936 is considered to be a junior subjective synonym of Lichas Dalman, 1827. L. gotlandicus Angelin, 1854 and L. palifer Lindstrom, 1885 are respectively considered to be subjective synonyms of Lichas latifrons Angelin, 1854 and Lichas araneus Lindstrom, 1885. L. triquetrus Lindstrom, 1885 is considered to be a juniour subjective synonym of Dicranopeltis salteri (Fletcher, 1850). Named species from Gotland also occur in the East Baltic, Scotland, England and Wales. One unnamed species which possibly belongs to Dicranogmus is considered identical to one from the Wenlock of Greenland. The Lichidae of Gotland also show close affinities to species from Ejin Qui Province in China and the Chicago area of the U.S.A. Trilobites belonging to the families Aulacopleuridae, Brachymetopidae, Calymenidae, Cheiruridae, Encrinuridae, Illaenidae, Lichidae, Odontopleuridae, Phacopidae, Proetidae and Styginidae from the Silurian of southern Norway are described. Fifty-seven forms (forty-one named, fourteen of which are new and sixteen are under open nomenclature) are assigned to AoePnaspis, Apotinupus, Bumastus, Calymene, Choneliobapges, Cyphoppoetus, Diaoalymene, Diopanopeltis, Dudleyaspis, Eccaipos gen. nov., Ekwanoscutellum, Encrinupus, Eophacops, Hadromepos, Harpidella, Hedstroemia, Leonaspis, Lichas, Opsypharus, Platylichas, Proetus, Pseudotupolichas, and Warburgella. Illaenus rotundus Kiaer, 1908, Illaenus sculptus Kiaer, 1908 and Illaenus thomsoni Salter, 1867 are considered junior subjective synonyms of Stenopapeia glaber (Kjerulf, 1865). Bumastus? phrix Lane & Thomas, 1978 and B. depressus Kiaer, 1908 are respectively considered to be junior subjective synonyms of Bumastus? inf1atus (Kiaer, 1908) and Opsypharus maccallumi (Salter, 1867). ...