''Ceratobairdia'' is an extinct

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial n ...

ostracod Ostracods, or ostracodes, are a class of the Crustacea (class Ostracoda), sometimes known as seed shrimp. Some 70,000 species (only 13,000 of which are extant) have been identified, grouped into several orders. They are small crustaceans, typic ...

(seed shrimp) belonging to the order

Podocopida The Podocopida are an order of ostracods in the subclass Podocopa. It is the most diverse of the four orders of ostracods, and also has a rich fossil record. Taxonomy The following suborders and unassigned taxa are contained in the order Podocop ...

and family Bairdiidae. Specimens have been found in

Permian The Permian ( ) is a geologic period and stratigraphic system which spans 47 million years from the end of the Carboniferous Period million years ago (Mya), to the beginning of the Triassic Period 251.9 Mya. It is the last period of the Pale ...

Jurassic The Jurassic ( ) is a Geological period, geologic period and System (stratigraphy), stratigraphic system that spanned from the end of the Triassic Period million years ago (Mya) to the beginning of the Cretaceous Period, approximately Mya. The J ...

beds in North America, China, and Europe. The genus is heavily ornamented, and a distinctive characteristic is that its valves (shells) have a flat ventral surface and a ventrolateral alate ridge (a winglike ridge extending from the ventral surface to the side of the valve.) The genus is also notable as a

Lazarus taxon In paleontology, a Lazarus taxon (plural ''taxa'') is a taxon that disappears for one or more periods from the fossil record, only to appear again later. Likewise in conservation biology and ecology, it can refer to species or populations tha ...

, disappearing in the Permian-Triassic extinction event and reappearing in the

Carnian The Carnian (less commonly, Karnian) is the lowermost stage of the Upper Triassic Series (or earliest age of the Late Triassic Epoch). It lasted from 237 to 227 million years ago (Ma). The Carnian is preceded by the Ladinian and is followe ...

, an interval of at least 15 million years.

Species

*''

Ceratobairdia ambigua ''Ceratobairdia'' is an extinct genus of ostracod (seed shrimp) belonging to the order Podocopida and family Bairdiidae. Specimens have been found in Permian to Jurassic beds in North America, China, and Europe. The genus is heavily ornamented, ...

'' Ishizaki 1964 *''

Ceratobairdia dorsospinosa ''Ceratobairdia'' is an extinct genus of ostracod (seed shrimp) belonging to the order Podocopida and family Bairdiidae. Specimens have been found in Permian to Jurassic beds in North America, China, and Europe. The genus is heavily ornamented ...

'' Sohn 1954 * ''

Ceratobairdia sinensis ''Ceratobairdia'' is an extinct genus of ostracod (seed shrimp) belonging to the order Podocopida and family Bairdiidae. Specimens have been found in Permian to Jurassic beds in North America, China, and Europe. The genus is heavily ornamented ...

'' Wang 1978 * ''

Ceratobairdia triassica ''Ceratobairdia'' is an extinct genus of ostracod (seed shrimp) belonging to the order Podocopida and family Bairdiidae. Specimens have been found in Permian to Jurassic beds in North America, China, and Europe. The genus is heavily ornamented ...

'' Bolz 1971 *''

Ceratobairdia venterocostata ''Ceratobairdia'' is an extinct genus of ostracod (seed shrimp) belonging to the order Podocopida and family Bairdiidae. Specimens have been found in Permian to Jurassic beds in North America, China, and Europe. The genus is heavily ornamented ...

'' Wang 1978 *''

Ceratobairdia xiaobaensis ''Ceratobairdia'' is an extinct genus of ostracod (seed shrimp) belonging to the order Podocopida and family Bairdiidae. Specimens have been found in Permian to Jurassic beds in North America, China, and Europe. The genus is heavily ornamented ...

'' Xie 1989

References

Paleozoic life Ostracods Prehistoric ostracod genera {{Paleo-crustacean-stub