189 © Museum für Tierkunde Dresden, ISSN 1864-5755, 18.07.2012 62 (2) 2012 189 – 212 Vertebrate Zoology Description of Apistogramma allpahuayo sp. n., a new dwarf cichlid species (Teleostei: Perciformes: Geophaginae) from in and around the Reserva Nacional Allpahuayo Mishana, Loreto, Peru * UWE RÖMER 1, 2 , JOSCHA BENINDE 1, 2 , FABRICE DUPONCHELLE 1, 3, 4 , ANTONIA VELA DÍAZ 1, 5 , HERNÁN ORTEGA 6 , INGO HAHN 7 , DAVID PATRICIO SOARES 8 , CATALINA DÍAZ CACHAY 1, 3 , CARMEN ROSA GARCÍA DÁVILA 1, 5 , SUSANA SIRVAS CORNEJO 1, 3 & JEAN-FRANÇOIS RENNO 1, 4, 5 1 Laboratoire Mixte International – Evolution et Domestication de l’Ichtyofaune Amazonienne (LMI - EDIA) 2 University of Trier, Inst. Biogeography, Dep. Geo-Sciences, 54286 Trier, Germany; and: Linteler Straße 19, 33334 Gütersloh, Germany eu.roemer@t-online.de (corresponding author) 3 Universidad Nacional Federico Villareal, Facultad de Oceanografía y Ciencias Alimentarías, 350 calle Roma, Miraflores, Lima, Perú 4 Institut de Recherche pour le Développement (IRD), UMR ISE-M, 361 rue Jean-François Breton BP5095, 34196 Montpellier Cedex 5, France 5 Instituto de Investigaciones de la Amazonia Peruana (IIAP), km 2.5, Avenida Abelardo Quiñones, Iquitos, Perú 6 Museo de Historia Natural, Universidad Nacional Mayor de San Marcos, Av. Arenales 1256, Jesús María, Lima, Perú 7 Institute of Landscape Ecology, Biogeography and Animal Ecology Research Group, Robert-Koch-Straße 28, 48149 Münster; Germany; and: Dept. Ecologia, Pontificia Universidad Catolica de Chile, Alameda 340, Casilla 114-D, Santiago, Chile 8 14818 Bluegrass Loop, Sisters, Oregon 97759, USA Accepted on March 05, 2012. Published online at www.vertebrate-zoology.de on July 06, 2012. > Abstract A new species of Apistogramma is described from Peru, based on a total of 51 specimens collected in small forest brooks in and around the Reserva Nacional Allpahuayo Mishana in the drainage of the Nanay river basin about 30 kilometres southwest of Iquitos, Departamento Loreto (approximately 73° 25’ W/03° 59’ S). Apistogramma allpahuayo sp. n. is distin- guished from all other Apistogramma species by the combination of black w-shape marking on lower jaw, (in adult males) lyrate caudal in, massive jaws and hypertrophied orange lips, distinct roundish caudal-peduncle spot clearly separated from lateral band ending at vertical bar 7, serrated dorsal in with conspicuous extensions of irst membranes, and proportions of dorsal-in spines differing from those otherwise typical within genus. Apistogramma allpahuayo sp. n. is thought to be a representative of the Apistogramma cacatuoides complex within the Apistogramma cacatuoides lineage. > Resumen Una nueva especie de Apistogramma es descrita para Perú, a partir de un total de 51 muestras colectadas en pequeñas que- bradas en el Reserva Nacional Allpahuayo Mishana en la cuenca del río Nanay, a unos 30 kilómetros al suroeste de Iquitos, Departamento de Loreto (aproximadamente 73°25´W/03°59´S). Apistogramma allpahuayo sp. n. se distingue de todas las otras especies de Apistogramma por la combinación de una marca negra en forma de w en la mandíbula inferior, – en los * This is publication number 2 from the Apistogramma Project within the Laboratoire Mixte International.