The Conodonts Hindeodus, Isarcicella and Sweetohindeodus in the Uppermost Permian and Lowermost Triassic

Abstract

Illindeodus REXROAD & FURNISH, 1964 and Isarcicella KOZUR, 1975 belong to the stratigraphically most important fossils near the Permian-Triassic boundary. The first appearance of H. parvus (KOZUR & PJATAKOVA) in the phylomorphogenetic lineage H. typicalis - H. latidentatus praeparvus - H. parvus is the best marker for the P/T boundary. Some representatives of Hindeodus and Isarcicella are insufficiently known. Consequently, all known lHindeodus and Isarcicella  species from near the P/T boundary, are redescribed or discussed. Hindeodus parvus erectus n.subsp.., H. julfensis wardlawi n.subsp., H. latidentatus praeparvus n.subsp. and H. sosioensis n.sp., and the new genus Sweetihindeodus n.gen. with two species, Sweetohindeodus bidentatus n.gen. n.sp. and S. tridentatus are proposed.