Establishment of a new subfamily of Idyanthidae Lang, 1944 with the description of a new species of Pseudometeorina George & Wiest, 2015 (Copepoda, Harpacticoida) from the Eratosthenes Seamount (eastern Mediterranean Sea)

Abstract The description of Pseudometeorina eratosthenica sp. nov. from the eastern Mediterranean Eratosthenes Seamount was release for a detailed phylogenetic comparison group derived representatives family Idyanthidae Lang, 1944, namely Aspinothorax Moura & Martínez Arbizu, 2003, Meteorina George, 2004, George Wiest, 2015, and Styracothorax Huys, 1993. named genera share presence 2-segmented P1 exopod as well transverse elongation bases swimming legs P1–P4, being these five deviations unique therefore hypothesized here synapomorphic above-named taxa. Consequently, they are pooled in newly established Aspinothoracinae 2003 subfam. new species described doubtlessly belongs to , sharing with P. mystica set 24 synapomorphies. Otherwise, provides nine autapomorphies that justify its establishment distinct species. A analysis, based on 131 morphological characters, is presented. Moreover, key provided.