Pteronotropis signipinnis

Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Megaclassis: Osteichthyes
Superclassis/Classis: Actinopterygii
Classis/Subclassis: Actinopteri
Subclassis/Infraclassis: Neopterygii
Infraclassis: Teleostei
Megacohors: Osteoglossocephalai
Supercohors: Clupeocephala
Cohors: Otomorpha
Subcohors: Ostariophysi
Sectio: Otophysa
Ordo: Cypriniformes
Subordo: Cyprinoidei

Familia: Leuciscidae
Subfamilia: Pogonichthyinae
Genus: Pteronotropis

Species: Pteronotropis signipinnis

The flagfin shiner (Pteronotropis signipinnis) is a species of ray-finned fish in the family Cyprinidae (minnows), in the order Cypriniformes (carp).
Distribution

This freshwater species is benthopelagic and usually occurs over sand near vegetation, in creeks, small rivers, and flowing pools and runs of headwaters. They are found in the United States in the Apalachicola river in Florida, Pearl River in Mississippi, and parts of Louisiana. They are also found in Alabama but occur rarely.[3][4][5]
Description

It is small and colourful, growing to between 40 and 55 mm (1.6 and 2.2 in). The body tapers to a narrow caudal peduncle. Much of the sides are covered by a lateral band dark in colour. The caudal, dorsal and anal fins are yellow or red-orange with black marginal rays. Present on the caudal fin base are two bright sulfur-yellow spots, with the region between the spots being substantially darker.[3] The flagfin shiner exists syntopically with the sailfin shiner, P. hypselopterus, and the two can be difficult to differentiate. It can be distinguished by its red fins, yellow tail spots, and smaller nuptial tubercles.
Etymology

"Pteronotropis" means "winged keeled back", which refers to the breeding males' enlarged dorsal fin. "Signipinnis" means "banner fin", referring to the striking color of the median fins.
References

NatureServe (2013). "Pteronotropis signipinnis". IUCN Red List of Threatened Species. 2013: e.T202356A18234739. doi:10.2305/IUCN.UK.2013-1.RLTS.T202356A18234739.en. Retrieved 19 November 2021.
"Notropis signipinnis". Integrated Taxonomic Information System. Retrieved 30 July 2010.
"Flagfin Shiner in Alabama". Outdooralabama.com. Retrieved 2010-07-30.
Froese, Rainer; Pauly, Daniel (eds.) (2012). "Pteronotropis signipinnis" in FishBase. July 2012 version.
Brett Albanese (January 2000). "Reproductive Behavior and Spawning Microhabitat of the Flagfin Shiner Pteronotropis signipinnis". American Midland Naturalist. 143 (1): 84–93. doi:10.1674/0003-0031(2000)143[0084:rbasmo]2.0.co;2. JSTOR 3082986.