Dr. Wilson J.E.M. Costa has described two new species of Nothobranchius related to N. melanospilus based on museum specimens. The article was published in Vertebrate Zoology (6(1): 73-82 – 27.2.2019 .
During a revision of material identified in museum collections as Nothobranchius melanospilus, two new species were recognized: N. kwanlensis, new species from the Ramisi River Basin, southeastern Kenya, and N. prognathus, new species, from the upper Wami River basin, eastern Tanzania. Both species are distinguished from N. melanospilus by the relative position of the dorsal-fin origin in females, presence of dark spots on the whole flank in females, the two sections of the anterior supraorbital series of neuromasts well-separated, and the presense of fewer mandibular neuromasts. Nothobranchius prognathus is distinguished from the other species of the N. melanospilus complex by the shape of the snout and eye, frontal squamation, and basal portion of the pelvic fins medially united in males. Additional morphometric characters were found informative to diagnose species of the N. melanospilus complex.
EDITOR COMMENT: Dr. Costa separated these species based primarily on physical meristics. There were no DNA studies noted in the article. Both of these species may well have been in the hobby at one time or another but the collection locations are not found as a listed species. Both species were collected by Lothar Seegers in 1997. Photos of several location/populations of N. melanospilus are found in Seegars Aqualog “Killifishes of the World: Old World Killies II” . While not specifically identified from the localities noted in the Costa paper, a couple may be fish Costa has used for his research.