Regina

Superregnum: Eukaryota
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Cladus: Craniata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Superclassis: Tetrapoda
Cladus: Reptiliomorpha
Cladus: Amniota
Classis: Reptilia
Cladus: Eureptilia
Cladus: Romeriida
Subclassis: Diapsida
Cladus: Sauria
Infraclassis: Lepidosauromorpha
Superordo: Lepidosauria
Ordo: Squamata
Subordo: Serpentes
Infraordo: Caenophidia
Superfamilia: Colubroidea

Familia: Colubridae
Subfamilia: Natricinae
Genus: Regina
Species (2): R. grahamii – R. septemvittata
Name

Regina Baird & Girard, 1853: 45 [conserved name]

Type species: Coluber septemvittatus Say, 1825, by subsequent designation by the International Commission on Zoological Nomenclature (1962: 145).
Placed on the Official List of Generic Names in Zoology by Opinion 632 (1962).

References
Primary references

Baird, S.F. & Girard, C.F; 1853. Catalogue of North American Reptiles in the Museum of the Smithsonian Institution. Part 1.-Serpents. Smithsonian Inst.: Washington. xvi + 172 pp. BHL
International Commission on Zoological Nomenclature. 1962. Opinion 632. Regina Baird and Girard, 1853 (Reptilia); designation of a type-species under the plenary powers. Bulletin of Zoological Nomenclature 19(3): 145–147. BHL Reference page.

Links

Uetz, P. & Hallermann, J. 2022. Regina . The Reptile Database. Accessed on 12 October 2019.
Regina – Taxon details on Interim Register of Marine and Non-marine Genera (IRMNG).
Regina – Taxon details on Integrated Taxonomic Information System (ITIS).

Vernacular names
English: Crayfish Snakes

Regina is a genus of semiaquatic natricine colubrid snakes known as crayfish snakes, named after their primary choice of diet. The genus consists of two species which are found in the eastern and central United States.

Species

The following two species are recognized as being valid.[1]

Regina grahamii Baird & Girard, 1853 – Graham's crayfish snake
Regina septemvittata (Say, 1825) – queen snake

Description

Both species in the genus Regina have keeled dorsal scales in 19 rows at midbody, and a divided anal plate. The crayfish snakes of the genus Regina have smaller heads than the water snakes of the genus Nerodia.[2]
References

Genus Regina at The Reptile Database. www.reptile-database.org.

Powell R, Conant R, Collins JT (2016). Peterson Field Guide to Reptiles and Amphibians of Eastern and Central North America, Fourth Edition. Boston and New York: Houghton Mifflin Harcourt. xiv + 494 pp., 47 plates, 207 figures. ISBN 978-0-544-12997-9. (Genus Regina, p. 422).