Pseudochroaptomus ecuadoriensis-a new genus and species of Philonthina and its systematic placement (Coleoptera: Staphylinidae: Staphylininae) Author Chani-Posse, Mariana Raquel Laboratorio de Entomología, Instituto Argentino de Investigaciones de las Zonas Aridas (IADIZA, CCT CONICET, Mendoza), Casilla de Correo 507, 5500 Mendoza, Argentina & Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Cuyo, Mendoza, Argentina Author Ramírez-Salamanca, José Manuel Laboratorio de Entomología, Instituto Argentino de Investigaciones de las Zonas Aridas (IADIZA, CCT CONICET, Mendoza), Casilla de Correo 507, 5500 Mendoza, Argentina & Programa de Posgrado en Biología, Universidad Nacional de Cuyo, Mendoza, Argentina Author Gualdrón-Díaz, Juliette Cristina Laboratorio de Entomología, Instituto Argentino de Investigaciones de las Zonas Aridas (IADIZA, CCT CONICET, Mendoza), Casilla de Correo 507, 5500 Mendoza, Argentina & Programa de Doctorado en Ciencias Biológicas, Universidad Nacional de Córdoba, Córdoba, Argentina text Zootaxa 2024 2024-05-09 5448 1 117 127 http://dx.doi.org/10.11646/zootaxa.5360.3.8 journal article 10.11646/zootaxa.5448.1.7 1175-5326 11231351 D5E68893-034F-4FB8-B1DD-ABE7EAA49206 Pseudochroaptomus ecuadoriensis sp. n. Diagnosis. As for the genus (see above). Description. Body length 8.2–10.2 mm ( 4.9–5.9 mm , abdomen excluded), body overall scarcely setose, almost glabrous. Colouration : as in diagnosis. Head moderately to slightly longer than wide (HW/HL= 0.84–0.92), moderately narrower than pronotum at widest point (HW/ PW= 0.77); postgenal and ventral basal ridges joining each other medially; postmandibular ridge separated from mandibular base. Eyes about as long as temples (EL/TL = 0.96–1.0) seen from above. Antennae with first antennomere moderately shorter than second and third combined, third about 1.3 × as long as second, fourth-tenth longer than wide. Labial palpus with third palpomere about 1.5 × as long as second (Lp3L/Lp2L=1.4–1.6). Maxillary palpus with fourth palpomere (apical) no longer than 1.4 × as long as third (Mp4L/Mp3L=1.2–1.4). Neck about 0.6 × as wide as head at widest point. Pronotum moderately longer than wide (PW/PL = 0.83–0.86), dorsal rows of punctures each with 4 punctures. Legs : Mesotarsi and metatarsi each about as long as mesotibiae and metatibiae respectively, first metarsomere longer than fifth (S1/S5= 1.65– 1.80). Elytra at sides slightly to moderately longer than pronotum at midline (EtL/PL=1.07–1.31). Male sexual characters : Sternum 8 moderately emarginate medio-apically, emargination with semi-membranous extension ( Fig. 4 ). Aedeagus with median lobe gradually narrowed from base into a distinctly acute apex, parameres fused into a single, rod-like sclerite reaching two thirds of median lobe length, internal sac with spiny sclerotized structures ( Figs. 3 , 7, 8 ). Female sexual characters : As described for genus. Geographical distribution. As for the genus. Etymology. The specific name refers to the country of origin of this specimen. Type material . Holotype m#, with labels: [white label]´ ECUADOR Napo prov. / Cabanas San Isidro , FIT / Cock of the Roach Trail / 2km NW Cosanga´,´ 00° 33´S , 77° 57´W / 20–23.vii.1998 , 2150m , premontane rainforest´,´ Ratcliffe , Jameson , Smith , Villatoro leg. FIELD MUS. NAT. HIST .´,´ Holotype Pseudochroaptomus Chani-Posse & Ramírez-Salamanca 2024 ´(red label) ( FMNH ). Four paratypes with same data, 3 m #, 1 f# ( FMNH ) .