''Doulingoceras'' is a genus of

ammonoid Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely related to living coleoids (i.e., octopuses, squid and cuttlefish) ...

within the ceratitid order, found in China, that lived during the

Late Permian Late may refer to: * LATE, an acronym which could stand for: ** Limbic-predominant age-related TDP-43 encephalopathy, a proposed form of dementia ** Local-authority trading enterprise, a New Zealand business law ** Local average treatment effect, ...

during the time span from about 260.5 to 254 million years ago. The genus is included in the family Paraceltitidae, which belongs to the superfamily Xenodiscaceae. ''Doulingoceras'' produced a narrowly discoidal evolute shell with concave sides, a narrowly rounded rim (venter) that bears several longitudinal lirae, and transverse rigs that have nodes at the umbilical and ventrolateral shoulders that form spiral belts. The suture is identical to that of '' Paraceltites'' in which the lobes are unserrated. ''Doulingoceras'' closely resembles ''Paraceltites'' in the shape of shell and suture; but it may be distinguished from the latter by the concave sides and the node-like transverse ribs in the early stage and two rows of nodes distributed respectively along the ventral edge and the umbilical shoulder at maturity. The type species, ''Doulingoceras nodosum'', named by Zhou, 1985, was originally found in black marine mudstone in the Douling Formation in Hunan Provence, China.

References

GONIAT-online ''Doulingoceras'' entryThe Paleobiology Database ''Doulingoceras'' entry
Paraceltitidae Permian ammonites Ceratitida genera Permian animals of Asia Permian China {{Ceratitida-stub