Abstract
Abstract. Embolomeri were semiaquatic predators prevalent in the Carboniferous, with
only two species from the early Permian (Cisuralian). A new embolomere,
Seroherpeton yangquanensis gen. et sp. nov. (Zoobank Registration number:
urn:lsid:zoobank.org:act:790BEB94-C2CC-4EA4-BE96-2A1BC4AED748, registration: 23 November 2020), is named based on a partial right upper jaw and palate
from the Sunjiagou Formation of Yangquan, Shanxi, China, and is late
Wuchiapingian (late Permian) in age. It is the youngest embolomere known to
date and the only embolomere reported from North China Block. Its
phylogenetic position within Embolomeri is confirmed by the strongly
developed descending flange on the quadrate ramus of the pterygoid. The new
taxon is unique among embolomeres by features like a partial coverage of a
denticle shagreens on the pterygoid; presence of a cylindrical shaft on the
pterygoid, and two pairs of very large ectopterygoid tusks. Phylogenetic
analysis shows Seroherpeton as being the sister group of a clade consisting of
Proterogyrinus, Archeria, and Pholiderpeton. We hypothesize that the dispersal and decline of the embolomeres
from Carboniferous to late Permian (Lopingian) is related to the climate
changes, especially aridification, of the paleotropical regions.
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