Eretmorhipis

Eretmorhipis (meaning "oar fan" from the Greek ερετμον ("oar") and ῥιπίς ("fan")) is an extinct genus of hupehsuchian marine reptile from the Early Triassic of China. It is currently known from two specimens that were discovered in an exposure of the Jialingjiang Formation in Yuan'an County, Hubei and referred to the newly named species Eretmorhipis carrolldongi in 2015. One of those specimens, the holotype WGSC V26020, had been known since 1991 and consists of the entire skeleton excluding the skull. The second specimen, IVPP V4070, is an impression of the right side of the back half of the skeleton, as well as part of the right forelimb. Eretmorhipis is unique among hupehsuchians in having manual and pedal digits that radiate in a fan-like shape. Like other hupehsuchians it has three overlapping layers of armor-like osteoderms over its spine, but the osteoderms of the uppermost layer are significantly larger than they are in other hupehsuchians, each spanning the length of four vertebrae. These upper-layer osteoderms are also widely spaced. The torso of Eretmorhipis is elongate and encased in a bony tube formed from thickened ribs and gastralia, similar to the bony tube of the hupehsuchian Parahupehsuchus but less extensive. The authors of the 2015 paper that named Eretmorhipis performed a phylogenetic analysis and found that it was one of the most derived hupehsuchians, forming a clade that they called Parahupehsuchinae with Parahupehsuchus and an unnamed polydactylus hupehsuchian. Below is a cladogram from their analysis: