Abstract
Paretroplus loisellei, a new species of etropline cichlid from Madagascar, is described from the middle to lower reaches of the Mahanara River, located to the north of the Masoala Peninsula in northeastern Madagascar. The new species is recovered within the “Paretroplus damii clade” on the basis of several apomorphic anatomical features, including the presence of a triangular, black or dark gray, pectoral-axil patch, chest scales that are greatly reduced in size and highly embedded, and flank scales in which the posterior field is thin and unossified. The new species is distinguished from its sister taxon, P. damii, by a more or less horizontal profile extending from the anterior margin of the lower jaw to the ventroposterior margin of the suspensorium (vs. strongly rounded and convex), horizontally oriented oral jaws with fleshy lips (vs. oblique and thin), tricuspid symphyseal teeth in the upper jaw with distinct and sharp lateral cusps, a much darker overall pigmentation pattern, and distinctive bright golden breeding coloration (vs. brick red).References
Allgayer, R. (1998) Descriptions de Lamena nourissati sp. n. genre et espèce nouveaux, endemiques de Madagascar (Teleostei: Etroplinae). Revue Française des Cichlidophiles, 179, 7–17.
Barel, C.D.N., van Oijen, M.J.P., Witte, F. & Witte-Maas, E. (1977) An introduction to the taxonomy and morphology of the haplochromine Cichlidae from Lake Victoria. Netherlands Journal of Zoology, 27, 333–389.
Bleeker, P. (1868) Description de trois espèces inédites de chromidoïdes de Madagascar. Verslagen en Mededeelingen der Koninklijke Akademie van Wetenschappen. Afdeeling Natuurkunde, Amsterdam, 2, 2, 307–314.
Bremer, K. (1988) The limits of amino-acid sequence data in angiosperm phylogenetic reconstruction. Evolution, 42, 795–803.
Bremer, K. (1995) Branch support and tree stability. Cladistics, 10, 295–304.
Cichocki, F.P. (1976) Cladistic history of cichlid fishes and reproductive strategies of the American genera Acarichthys, Biotodoma, and Geophagus. Vol. 1. Unpublished Ph.D. dissertation, University of Michigan, Ann Arbor.
Goloboff, P.A. (1995) A revision of the South American spiders of the family Nemesiidae (Araneae, Mygalomorphae). Part I: Species from Peru, Chile, Argentina, and Uruguay. Bulletin of the American Museum of Natural History, 224, 1–189.
Goloboff, P.A. (1998) NONA. Vers. 3.0. Program and documentation. Tucumán, Argentina: Fundación e Instituto Miguel Lillo.
Goloboff, P.A. (1999) Analyzing large data sets in reasonable times: solutions for composite optima. Cladistics, 15, 415–428.
Greenwood, P.H. (1956) The monotypic genera of cichlid fishes in Lake Victoria. Bulletin of the British Museum (Natural History) Zoology, 3(7), 295–333.
Leviton, A.E., Gibbs, R.H., Heal, E. & Dawson, C.E. (1985) Standards in herpetology and ichthyology: Part I. Standard symbolic codes for institutional resource collections in herpetology and ichthyology. Copeia, 1985, 802–832.
Loiselle, P.V. (2006) A review of the Malagasy Pachypanchax (Teleostei: Cyprinodontiformes, Aplocheilidae), with descriptions of four new species. Zootaxa, 1366, 1–44.
Nixon, K.C. (1999) The parsimony ratchet, a new method for rapid parsimony analysis. Cladistics, 15, 407–414.
Nixon, K.C. (2000) WinClada. Vers. 0.99. Ithaca, NY: Cornell University.
Rham, P. de. & Nourissat, J.-C. (2004) The endemic cichlids of Madagascar (English translation). French Cichlid Association, St. Julia, France, 191 pp.
Sabaj Pérez, M.H. (2010) Standard symbolic codes for institutional resource collections in herpetology and ichthyology: an Online Reference. Vers. 2.0. American Society of Ichthyologists and Herpetologists, Washington, D.C. Available from http://www.asih.org/ (accessed 8 December 2010).
Slowinski, J.B. (1998) The number of multiple alignments. Molecular Phylogenetics and Evolution, 10, 264–266.
Sparks, J.S. (2002) Ptychochromis inornatus, a new cichlid (Teleostei: Cichlidae) from northwestern Madagascar, with a discussion of intrageneric variation in Ptychochromis. Copeia, 2002, 120–130.
Sparks, J.S. (2004) Molecular phylogeny and biogeography of the Malagasy and South Asian cichlids (Teleostei: Perciformes: Cichlidae). Molecular Phylogenetics and Evolution, 30, 599–614.
Sparks, J.S. (2005) Northwestern basins. In: Thieme, M.L., Abell, R., Stiassny, M.L.J., Lehner, B., Skelton, P., Teugals, G., Dinerstein, E., Kamdem Toham, A., Burgess, N. & Olson, D. (Eds.), Freshwater ecoregions of Africa and Madagascar. A conservation assessment. Island Press, Washington, D.C., pp. 311–312.
Sparks, J.S. (2008) Phylogeny of the cichlid subfamily Etroplinae and taxonomic revision of the Malagasy cichlid genus Paretroplus (Teleostei: Cichlidae). Bulletin of the American Museum of Natural History, 314, 1–151.
Sparks, J.S. & Stiassny, M.L.J. (2003) Introduction to the freshwater fishes. In: Goodman, S.M. & Benstead, J.P. (Eds.), The natural history of Madagascar. University of Chicago Press, Chicago, pp. 849–863.
Sparks, J.S. & Smith, W.L. (2004) Phylogeny and biogeography of cichlid fishes (Teleostei: Perciformes: Cichlidae). Cladistics, 20, 501–517.
Sparks, J.S. & Stiassny, M.L.J. (2008) Les poissons d’eaux douce. In: Goodman, S.M. (Ed.), Paysages Naturels et Biodiversité de Madagascar. Publications Scientifiques Muséum National d'Histoire Naturelle (MNHN), Paris, pp. 283–309.
Stiassny, M.L.J., Chakrabarty, P. & Loiselle, P.V. (2001) Relationships of the Madagascan cichlid genus Paretroplus Bleeker 1868, with description of a new species from the Betsiboka River drainage of northwestern Madagascar. Ichthyological Exploration of Freshwaters, 12, 29–40.
Stiassny, M.L.J. & Sparks, J.S. (2006) Phylogeny and taxonomic revision of the endemic Malagasy cichlid genus Ptychochromis (Teleostei: Cichlidae), with the description of five new species and a diagnosis for Katria, new genus. American Museum Novitates, 3535, 1–55.
Taylor, W.R. & Van Dyke, G.C. (1985) Revised procedures for staining and clearing small fishes and other vertebrates for bone and cartilage study. Cybium, 9, 107–119.
Varón, A., Vinh, L.S. & Wheeler, W.C. (2010) POY. Vers. 4: phylogenetic analysis using dynamic homologies. Cladistics, 26, 72–85.
Wheeler, W.C. (1996) Optimization alignment: the end of multiple sequence alignment in phylogenetics? Cladistics, 12, 1–9.
Wheeler, W.C. (2001) Homology and the optimization of DNA sequence data. Cladistics, 17, S3–S11.
Wheeler, W.C. (2003) Implied alignment: a synapomorphy-based multiple sequence alignment method. Cladistics, 19, 261–268.