Nothobranchius streltsovi, a new species of annual killifish with two male colour morphs from the Malagarasi drainage, central Tanzania (Teleostei: Cyprinodontiformes: Nothobranchiidae)

摘要

Nothobranchius streltsovi, new species, is described from specimens collected in pools associated with seasonal streams in upper catchments of the Ugalla River, Malagarasi drainage, central Tanzania. It belongs to the N. ugandensis species group based on male diagnostic characters comprising light blue scales with a broad, irregular reticulated pattern on the body, vivid red or orange oblique bars on the head and dorsum, yellow or blue anal fin, large vivid red spots on dorsal and anal fins, rounded head with a slightly concave to nearly straight dorsal profile, predorsal profile convex from nape to posterior extremity of dorsal -fin base, and variable cephalic squamation. Nothobranchius streltsovi has two sympatric colour morphs and is distinguished from all other members of the N. ugandensis group by the following combination of characters: scale margins orange; caudal fin orange, spotted proximally; pectoral fin spotted proximally; anal and pelvic fins with red dots, light blue proximally, yellow or creamy white distally; seven branchiostegal rays; 31-34 longitudinal, 14-16 transverse, and 15-16 circumpeduncular scales; supraorbital neuromast formula 2 +3 +4.