Abstract
Aphyosemion teugelsi is described from specimens collected in a small creek in the upper Wamba River basin in the southwest of the Democratic Republic of the Congo not far from the Angolan border. This is ~400 km outside the known distribution area of the genus. It is distinguished from all other members of the genus Aphyosemion by the combination of broad black margins on all fins in males, a robust lower jaw, a more convex back, a large head with large eyes, a more anterior position of the dorsal fin relative to anal fin, and absence of extensions on the upper and lower caudal fin.
References
Ahl, E. (1924) Über neue afrikanische Zahnkarpfen der Gattung Panchax. Zoologischer Anzeiger, 60, 303–313.
Amiet, J.L. (1987) Faune du Cameroun. Volume 2. Le genre Aphyosemion Myers (Pisces: Teleostei: Cyprinodontiformes). Sciences Naturales, Compiègne, 262 pp.
Boulenger, G.A. (1910) Poisson Cyprinodonte nouveau du Bas-Congo. Bulletins mensuels de Société des Naturalistes luxembourgeois, 4 (10), 285.
Boulenger, G.A. (1911) Descriptions of new African cyprinodont fishes. Annals and Magazine of Natural History, series 8, 8 (44), 260–268.
Brosset, A. (1982) Le peuplement de cyprinodontes du bassin de l'Ivindo, Gabon. Terre Vie, 36, 233–292.
Brosset, A. (2003) Convergent and divergent evolution in rain-forest populations and communities of cyprinodontiform fishes (Aphyosemion and Rivulus) in Africa and South America. Canadian Journal of Zoology, 81, 1484–1493.
Brosset, A. & Lachaise, D. (1995) Evolution as a lottery conflicting with evolution via sexual selection in African rain-forest-dwelling killifishes (Cyprinodontidae, Rivulinae, Diapteron). Evolutionary Biology, 28, 217–264.
Collier, G.E. (2007) The Genus Aphyosemion: Taxonomic History and Molecular Phylogeny. Journal of the American Killifish Association, 39 (5–6), 147–168.
Goldstein, R.J. & Ricco, J.F. (1970) A description of a new species of Aphyosemion, with notes on its maintenance in aquaria. Journal of the American Killifish Association, 7 (1), 8–10.
Hoedeman, J. (1958) The frontal scalation pattern in some groups of toothcarps (Pisces: Cyprinodontiformes). Bulletin of Aquatic Biology, 1, 23–28.
Huber, J.-H. (2007) Killi-Data 2007. Killi-Data Editions, Paris, 410 pp. (German edition) (online version: www.killi-data.org, last visited March 2009).
Kamdem Toham, A. & Teugels, G.G. (1997) Patterns of microhabitat use among fourteen abundant fish species from the lower Ntem River Basin in Cameroon. Aquatic Living Resources, 10, 289–298.
Kamdem Toham, A. & Teugels, G.G. (1998) Diversity patterns of fish assemblages in the Lower Ntem River Basin (Cameroon), with notes on potential effects of deforestation. Archiv für Hydrobiologie, 141, 421–446.
Kamdem Toham, A. & Teugels, G.G. (1999) First data on an index of Biotic Integrity (IBI) based on fish assemblages for the assessment of the impact of deforestation in a tropical West-African river. Hydrobiologia, 397, 29–38.
Meinken, H. (1951) Mitteilungen der Fischbestimmungsstelle des VDA. VI. Aphyosemion cognatum, eine neue Zahnkarpfenart aus dem Kongo-Gebiet. Die Aquarien- und Terrarienzeitschrift, 4 (10), 255–257.
Murphy, W.J. & Collier, G.E. (1999) Phylogenetic relationships of African killifishes in the genera Aphyosemion and Fundulopanchax, inferred from mitochondrial DNA sequences. Molecular Phylogenetics and Evolution, 11 (3), 351–360.
Poll, M. (1951) Notes sur les Cyprinodontidae du Musée du Congo belge. Première partie: les Rivulini. Revue de Zoologie et de Botanique Africaines, 45 (1–2), 157–171.
Radda, A.C. (1986) Cyprinodontiden-Studien in Zaire. Aquaria, 33 (10), 145–154.
Radda, A.C. & Huber, J.-H. (1977) Cyprinodontiden-Studien in Gabun. III. Zentral- und Südostgabun. Aquaria, 24 (4), 59–69.
Scheel, J.J. (1968) Rivulins of the Old World. TFH Publications, New Jersey, 480 pp.
Seegers, L. (1988) Bemerkungen über die Sammlung der Cyprinodontiformes (Pisces: Teleostei) des Zoologischen Museums Berlin. I. Die Gattungen Aphyosemion Myers, 1924 und Fundulosoma Ahl, 1924. Teil 2. Mitteilungen aus dem Zoologischen Museum in Berlin, 64 (1), 3–17.
Sonnenberg, R. (2007) Description of three new species of Chromaphyosemion Radda, 1971 (Cyprinodontiformes: Nothobranchiidae) from the coastal plains of Cameroon with a preliminary review of the Chromaphyosemion splendopleure complex. Zootaxa, 1591, 1–38.
Van Bergeijk, W.A. & Alexander, S. (1962) Lateral line canal organs on the head of Fundulus heteroclitus. Journal of Morphology, 110, 333–346.
Van der Zee, J.R. & Huber, J.-H. (2006) Zur Identität von Aphyosemion christyi (Boulenger, 1915), Aphyosemion schoutedeni (Boulenger, 1920) und Aphyosemion castaneum Myers, 1924. (Pisces, Cyprinodontiformes, Aplocheilidae). Deutsche Killifisch Gemeinschaft Journal, 38 (5), 131–142.
Wildekamp, R.H. (1993) A World of Killies. Atlas of the Oviparous Cyprinodontiform Fishes of the World. Volume 1. The American Killifish Association, Mishawaka, Indiana, 311 pp.
Wildekamp, R.H. (1996) A World of Killies. Atlas of the Oviparous Cyprinodontiform Fishes of the World. Volume 3. The American Killifish Association, Mishawaka, Indiana, 330 pp.