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Descripción De Un Nuevo Género Y Una Nueva Especie De Saprininae Neotropicales (Coleoptera: Histeridae)

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Descripción De Un Nuevo Género Y Una Nueva Especie De Saprininae Neotropicales (Coleoptera: Histeridae) Revista Mexicana de Biodiversidad Revista Mexicana de Biodiversidad 91 (2020): e913333 Taxonomía y sistemática Descripción de un nuevo género y una nueva especie de Saprininae neotropicales (Coleoptera: Histeridae) Description of a new genus and a new species of Neotropical Saprininae (Coleoptera: Histeridae) Gerardo Arriagada a y Fernando Hernán Aballay b, * a Museo Nacional de Historia Natural, Casilla 787, Correo Central, Santiago, Chile b Departamento de Biología, Instituto y Museo de Ciencias Naturales, Facultad de Ciencias Exactas Físicas y Naturales, Universidad Nacional de San Juan, Consejo Nacional de Investigaciones Científicas y Técnicas (Centro Científico Tecnológico San Juan), Av. Libertador Gral. San Martín 1109, J5400ARL San Juan, Argentina *Autor para correspondencia: [email protected] (F.H. Aballay) Recibido: 21 diciembre 2019; aceptado: 23 abril 2020 http://zoobank.org/urna: lsid: zoobank.org: pub: 0E3D4DAB-E755-4E2B-8A21-B07AC611D251 Resumen Se describe un nuevo género y especie de Saprininae: Paraeuspilotus monte n. gen., n. sp., que fue capturada en trampas de caída y en madrigueras del ratón nativo Ctenomys mendocinus Philippi, 1869, conocido comúnmente como tuco-tuco (Rodentia: Ctenomyidae). Paraeuspilotus monte fue registrada en la provincia biogeográfica del Monte, en Mendoza, Argentina. Se proporcionan figuras del adulto y detalles de diversas estructuras morfológicas externas e internas y genitalia de ambos sexos. Se discuten su biología y la asociación con C. mendocinus. Palabras clave: Taxonomía; Género nuevo; Especie nueva; Reserva de la Biosfera de Ñacuñán; Histeridae Abstract We describe a new genus and species of Saprininae: Paraeuspilotus monte n. gen., n. sp., which was captured in pitfall traps and in burrows of the native mouse Ctenomys mendocinus Philippi, 1869, commonly named tuco-tuco (Rodentia: Ctenomyidae). Paraeuspilotus monte was registered in the Monte biogeographic province, in Mendoza, Argentina. Figures of adult, and details of some external and internal morphological structures and genitalia of both sexes are provided. The biology and association with C. mendocinus are discussed. Keywords: Taxonomy; New genus; New species; Ñacuñán Biosphere Reserve; Histeridae ISSN versión electrónica: 2007-8706; Universidad Nacional Autónoma de México, Instituto de Biología. Open Access bajo la licencia CC BY-NC-ND (4.0) https://doi.org/10.22201/ib.20078706e.2020.91.3333 G. Arriagada, F.H. Aballay / Revista Mexicana de Biodiversidad 91 (2020): e913333 2 https://doi.org/10.22201/ib.20078706e.2020.91.3333 Introducción llanuras suavemente onduladas con cubierta vegetal arbóreo, de arbustos herbáceos y suelo desnudo. Un Saprininae es la segunda subfamilia más grande de quinto ejemplar perfectamente conservado fue obtenido la familia Histeridae, después de Histerinae, con más de de una cámara de nidificación de Ctenomys mendocinus, 620 especies descritas en todo el mundo (Lackner, 2010). habiendo sido extraído desde una profundidad de 1.6 m Para América del Sur, Mazur (2011) cita 9 géneros de (P. Cuello, com. pers.). Saprininae: Euspilotus Lewis (con 46 especies de las Los ejemplares fueron estudiados utilizando un cuales 3 fueron descritas recientemente por Dégallier et microscopio estereoscópico Bausch & Lomb, con aumento al. [2012], Arriagada [2015] y Arriagada et al. [2019]), entre 40× y 60×. Las fotografías se tomaron con cámara Satrapister Bickhardt (1 especie), Paramyrmetes Bruch (1 Canon 60D, con objetivo Canon modelo Mpe-65 mm; las especie), Phoxonotus Marseul (5 especies), Xerosaprinus fotografías del edeago y coxitos se tomaron con cámara Wenzel (4 especies), Saprinus Erichson (3 especies), montada en un microscopio Olympus CX31, con aumento Hypocaccus Thomson (2 especies), Gnathoncus Jacquelin de 100×. Los genitales fueron extraídos y colocados en una du Val (una especie) y Geomysaprinus Ross (2 especies). solución de KOH al 10% a 60 ºC, por 15 minutos, para A estas cifras, se deben adicionar los géneros Oosaprinus limpiarlos y separar sus partes, colocándolos después en Arriagada de la Patagonia argentina (Arriagada, 2017) y un vidrio reloj con alcohol al 90%, para su observación Tatianaella del litoral costero atlántico (Arriagada, 2018). inmediata. Antenas, piezas bucales, coxitos y espermateca Con base en el estudio realizado del material tipo y se montaron en portaobjetos cóncavos, utilizando bálsamo el análisis de las descripciones de las diferentes especies de Canadá; las piezas de los genitales masculinos se de Saprininae neotropicales y nuevos géneros descritos montaron en tarjetas de cartulina. por Arriagada (2017, 2018), se ha podido diferenciar un La longitud de los especímenes se tomó sin incluir conjunto de especímenes que comparten características la cabeza ni los tergitos abdominales, la calificación de particulares y propias que los separan de los restantes pequeño, mediano y grande para el tamaño, sigue lo géneros y especies conocidos de Saprininae. Estos indicado por Arriagada (2015). Para la nomenclatura ejemplares fueron recolectados en ambientes naturales de de estructuras morfológicas se ha seguido a Lackner la Reserva de la Biosfera de Ñacuñán, en la provincia de (2010). Las mediciones se realizaron con un micrómetro Mendoza, Argentina, mediante la utilización de trampas ocular y para las abreviaturas correspondientes, se siguió de caída y la examinación de las cámaras de nidificación a Ôhara (1994), indicándose en el texto de la siguiente de Ctenomys mendocinus. manera: PEL: longitud desde la línea formada por los El objetivo de este trabajo es describir un nuevo género ángulos anteriores del pronoto hasta ápice de los élitros, y especie de Saprininae. Éste es el segundo registro de EW: ancho máximo de élitros, APW: ancho entre los Saprininae asociado con madrigueras para América del ángulos anteriores del pronoto, PPW: ancho entre ángulos Sur, el primero fue registrado por Arriagada y Kovarik posteriores del pronoto, y EL: longitud del élitro a lo largo (2019) en el Departamento de Santa Cruz de la Sierra, de la línea de la sutura. Bolivia. Los acrónimos de las colecciones estudiadas: IADIZA: Instituto Argentino de Investigaciones de Zonas Áridas, Material y métodos Mendoza, Argentina; MNHNC: Museo Nacional de Historia Natural, Santiago, Chile; y CVMD: Colección Se estudiaron 5 ejemplares que fueron recolectados en Particular Víctor Manuel Diéguez M. la Reserva de la Biosfera de Ñacuñán (34º02’ S, 67º54’ O), ubicada en el departamento de Santa Rosa, provincia Descripción de Mendoza, Argentina. La reserva se sitúa en la provincia biogeográfica del Monte, que corresponde a un ambiente Paraeuspilotus Arriagada y Aballay, 2020 n. gen. desértico con estacionalidad marcada, con veranos cálidos Especie tipo: Paraeuspilotus monte n. sp., presente y húmedos e inviernos fríos y secos, y una precipitación designación. media anual de 330 mm (Cabrera y Willink, 1980). Diagnosis. Adultos con cuerpo oval y convexo; La provincia del Monte se extiende entre la Puna y la tamaño pequeño, tegumento brillante; rostro plano; estría Patagonia al este de la Cordillera de los Andes. frontal ausente; estría supraorbital y occipital presentes, Cuatro ejemplares fueron recolectados con trampas bien marcadas; ojos escasamente visibles en vista dorsal; de caída, instaladas con solución de propilenglicol al pronoto liso y sin depresiones en ángulos anteriores; 20%, permaneciendo en funcionamiento durante las estría marginal pronotal completa, fina, junto al margen; 4 estaciones del año. Las trampas fueron instaladas en hypomera setoso, no visible en vista dorsal; estrías elitrales G. Arriagada, F.H. Aballay / Revista Mexicana de Biodiversidad 91 (2020): e913333 3 https://doi.org/10.22201/ib.20078706e.2020.91.3333 1-4, finas, poco curvadas, presentes en los 3/4 anteriores http://zoobank.org/urna: lsid: zoobank.org: acto: 88CDC44F del élitro; cuerpo y fémures en vista ventral cubierto de -521A-4B06-9465-10DC5F9F527E cerdas blanquecinas, cortas, ordenadas y decumbentes, Diagnosis. Tamaño pequeño, de color castaño, excepto en los discos centrales del meso-metaventrito brillante; estría frontal ausente; estrías elitrales presentes, y disco central del primer segmento abdominal; estrías finas, poco curvadas, ocupando 3/4 anteriores del élitro; prosternales carinales divergentes y fusionándose con las cuarta estría elitral unida a la estría sutural por un arco estrías laterales en la mitad del largo de la quilla, que basal, fino, nítido y casi en 90 grados; superficie ventral continúan rectas por un cuarto del largo total de la quilla, con pilosidad blanquecina, corta, ordenada y decumbente, curvándose posteriormente hacia adentro y alcanzando en regular densidad y con la zona del disco del meso- separadamente el borde anterior del prosterno; quilla metaventrito y primer ventrito abdominal desprovistos de prosternal en vista lateral, cóncava en su mitad anterior esta pilosidad; en vista lateral, quilla prosternal cóncava en con notorio levantamiento, entre las estrías y algo distante su mitad anterior y sin fóveas preapicales, presentando un del borde anterior; sin fóveas preapicales; disco central notorio levantamiento subapical entre las estrías laterales. del metaventrito algo coniforme en ambos sexos; meso y Holotipo macho: PEL = 1.98 mm; EW = 1.65 mm; metatarsos alargados, el último el doble de largo que los APW = 0.675 mm; PPW = 1.35 mm; EL = 1.225 mm. 2 anteriores; con 2 largas cerdas en los tarsitos 1-4 en su Cuerpo oval, suavemente convexo, color castaño brillante, margen
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