''Jiuchengia longoccipita'' is a

coccosteid Coccosteidae is a family of arthrodire placoderms from the Early to Late Devonian. Fossils appear in various strata in Europe, North America and China. Phylogeny Coccosteidae belongs to the larger clade Coccosteomorphi, which together with its ...

arthrodire placoderm from the Late Emsian

epoch In chronology and periodization, an epoch or reference epoch is an instant in time chosen as the origin of a particular calendar era. The "epoch" serves as a reference point from which time is measured. The moment of epoch is usually decided by ...

of Wuding,

Yunnan Yunnan , () is a landlocked Provinces of China, province in Southwest China, the southwest of the People's Republic of China. The province spans approximately and has a population of 48.3 million (as of 2018). The capital of the province is ...

. Its skull is similar in form to those of ''

Watsonosteus ''Watsonosteus'' is an extinct genus of coccosteid arthrodire placoderm from the Late Givetian stage of the Middle Devonian period. Fossils are found in the Orkney Islands, Scotland. Phylogeny ''Watsonosteus'' is a member of the family Coccostei ...

'' and ''

Dickosteus ''Dickosteus'' is an extinct genus of coccosteid arthrodire placoderm from the Late Eifelian to Early Givetian stages of the Middle Devonian period. Fossils are found in the Orkneys and Caithness, Scotland. Phylogeny ''Dickosteus'' is a memb ...

'', though ''J. longoccipita'' can be easily distinguished from them in that its skull is longer, and has anatomical features in common with homostiids.

References

Coccosteidae Placoderms of Asia Paleontology in Yunnan Prehistoric animals of China Fossil taxa described in 1983 {{Placoderm-stub