A new species of the southern Central American genus Linoderus Sharp (Coleoptera: Staphylinidae: Staphylininae) with a revised key and an updated phylogeny Author Chani-Posse, Mariana Raquel 0000-0002-3466-7669 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 mchani @ mendoza-conicet. gob. ar; https: // orcid. org / 0000 - 0002 - 3466 - 7669 mchani@mendoza-conicet.gob.ar text Zootaxa 2021 2021-11-01 5060 3 439 446 journal article 3742 10.11646/zootaxa.5060.3.9 cd36da9c-a180-4a09-853e-5f954cebb346 1175-5326 5635984 27A9D1B2-2CB3-43C0-988A-0CB74203A198 Key to species of Linoderus Sharp 1. Antennae with antennomeres 4–7 or 4–9 distinctly darker than the basal and apical ones, pronotum reddish brown; 1st antennomere not longer than half of head length; labial palpus with 2nd palpomere longer than 3rd......................... 2 - Antennae with antennomeres 4–11 not distinctly darker than the basal ones, pronotum dark metallic blue; 1st antennomere moderately longer than half of head length, labial palpus with 2nd palpomere about as long as 3rd...................................................................................................... Linoderus smetanai sp. n. 2. Head metallic blue, antennae with antennomeres 4–9 dark brown; maxillary palpus with 4th palpomere 1.5 x about as long as 3rd............................................................................ Linoderus gracilipes Sharp - Head reddish brown, antennae with antennomeres 4–7 dark brown; maxillary palpus with 4th palpomere 1.8 x about as long as 3rd........................................................ Linoderus alajuelensis Chani-Posse & Solodovnikov