Anhuilong

Anhuilong (meaning "Anhui dragon") is a genus of mamenchisaurid dinosaur known from the Hongqin Formation of Anhui province, China. The genus contains a single species, Anhuilong diboensis.^[1]

Anhuilong Temporal range: Middle Jurassic, 174–162 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Skeletal diagram
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Clade:	Dinosauria
Clade:	Saurischia
Clade:	†Sauropodomorpha
Clade:	†Sauropoda
Family:	†Mamenchisauridae
Genus:	†Anhuilong Ren et al., 2020
Type species
†Anhuilong diboensis Ren et al, 2020

Discovery and naming

Holotype on display at Anhui Geological Museum in Hefei

Anhuilong is known from the holotype AGB 5822, a forelimb consisting of a left humerus, ulna, and radius. It is distinguished by the following combination of features: low ratios of the average of the greatest widths of the proximal end, mid-shaft and distal end of the humerus/length of the humerus, total length of ulna to humerus and total length of radius to humerus; the lateral edge of the deltopectoral crest directs caudolaterally, the lateral accessory condyle on the craniodistal edge of humerus is more robust than the medial one, and the cross-sectional shape of the ulna at mid-shaft is elliptical with highest ratio of transverse to craniocaudal diameter among mamenchisaurids.^[1]

Phylogeny

Speculative life restoration

Ren et al. (2020)^{[nb 1]} recovered Anhuilong as the sister taxon of Huangshanlong, with the closest relative of this clade being Omeisaurus tianfuensis. The results of their phylogenetic analysis are shown in the cladogram below:^[1]

Eusauropoda	Shunosaurus Mamenchisauridae Omeisaurus tianfuensis Anhuilong Huangshanlong Qijianglong Chuanjiesaurus Mamenchisaurus sinocanadorum Mamenchisaurus youngi Mamenchisaurus hochuanensis Mamenchisaurus anyuensis Mamenchisaurus constructus Yuanmousaurus "Omeisaurus maoianus" Barapasaurus Spinophorosaurus Nebulasaurus Patagosaurus Turiasaurus Atlasaurus Losillasaurus Haplocanthosaurus Neosauropoda