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New specimens of Stenocybus acidentatus (Therapsida: Dinocephalia) from the Middle Permian Dashankou Fauna of China
Author(s) -
JIANG Shan,
JI Shuan
Publication year - 2014
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/1755-6724.12233
Subject(s) - premaxilla , holotype , paleontology , clade , skull , dentition , anatomy , maxilla , fauna , permian , biology , geology , geography , phylogenetic tree , zoology , taxonomy (biology) , structural basin , ecology , biochemistry , gene
Abstract The basal dinocephalian clade Stenocybusidae was known from two incomplete specimens representing one generus, Stenocybus , from Dashankou fanua in Yumen, Gansu Province of China. The holotype of Stenocybus acidentatus is laterally compressed, making some characters unclear. Here we describe two new specimens of Stenocybus acidentatus from the same locality, an anterior portion of skull with articulated jaws, and a right dentary with nearly complete dentition. They show some detailed features on the morphology of the premaxilla, maxilla, nasal, external nares and dentary. The phylogenetic relationship between Stenocybus acidentatus and the relatively large Sinophoneus yumenensis is still difficult to determine, and needs more new complete material and further evidences.