Trimerorhachis (Amphibia: Temnospondyli) from the Lower Permian of Texas and New Mexico: cranial osteology, taxonomy and biostratigraphy

The morphology and taxonomy of the Early Permian temnospondyl amphibian genus Trimerorhachis are revised. Using previously undescribed material from Texas, numerous details of the cranial osteology of T. insignis Cope, 1878 are redescribed. Emphasis is placed on the structure of the palate, the sutures of the skull roof, and on the variation of some phylogenetically important character-states. The taxonomic revision, which makes particular use...