Description of Pseudosteineria longisetis sp. n. from northeastern Brazil with a review of the genus Pseudosteineria Wieser, 1956 (Nematoda: Xyalidae) Author Cidreira, Gabriel Laboratório de Geoecologia de Sedimentos Marinhos (GEOECO), Instituto de Biologia, Universidade Federal da Bahia gabrielcidreira2@hotmail.com Author Venekey, Virág Grupoe de Estudos de Nematoda Aquáticos, Laboratório de Pesquisa em Monitoramento Ambiental Marinho, Universidade Federal do Pará. Author De Souza Alves, Orane F. Laboratório de Geoecologia de Sedimentos Marinhos (GEOECO), Instituto de Biologia, Universidade Federal da Bahia Author Kelmo, Francisco Centro de Pesquisa em Ecologia Marinha e Costeira (CEPEMAC), Instituto de Biologia, Universidade Federal da Bahia text Zootaxa 2020 2020-04-14 4763 3 354 370 journal article 22910 10.11646/zootaxa.4763.3.2 c5f59fb3-2a72-4d62-bfe4-6a8be11a7006 1175-5334 3758615 urn:lsid:zoobank.org:pub:C80E006C-BCEB-4681-9065-12C20820B307 Genus Pseudosteineria Wieser, 1956 Type species: Pseudosteineria anteferens Wieser, 1956 . Diagnosis (emended after Wieser 1956 and Tchesunov 2000 ). Xyalidae . Body spindle-shaped. Cuticle distinctly annulated. Lateral differentiation may be present as lateral fields. Anterior sensilla in two crowns (6 + 12) with the second crown composed of six anterior outer labial sensilla, four posterior cephalic sensilla, and two additional lateral sensilla. Long subcephalic (cervical) setae, arranged in six or eight groups about the level of the amphids, at some distance posteriorly to the cephalic capsule. In each group several subcephalic setae arranged in a short longitudinal row where the setae gradually increase in length posteriorly. Other somatic setae can be short or very long, scarce or abundant, and irregularly distributed along the body. Amphideal fovea circular, just before, just behind or at the level of subcephalic setae. Buccal cavity conical. Copulatory apparatus variable in shape. Tail conico-cylindrical, consisting of proximal conical and slender cylindrical distal parts. Tail tip slightly inflated and provided with long terminal setae. List of valid species of Pseudosteineria Wieser, 1956 Pseudosteineria anteferens Wieser, 1956 = Theristus (Pseudosteineria) anteferens Wieser, 1956 Pseudosteineria anteramphida Sun, Huang, Tang, Zang, Xiao & Tang, 2019 Pseudosteineria anticipans Wieser, 1956 = Theristus (Pseudosteineria) anticipans Wieser, 1956 Pseudosteineria coronata ( Gerlach, 1955 ) Wieser, 1959 = Theristus coronatus Gerlach, 1955 = Theristus (Pseudosteineria) metacoronatus Wieser, 1959 secondary homonym to Theristus coronatus ( Stekhoven, 1950 ) = Metadesmolaimus coronatus Stekhoven, 1950 Pseudosteineria horrida ( Steiner, 1916 ) Wieser, 1956 = Monohystera horrida Steiner, 1916 = Theristus (Pseudosteineria) horridus Wieser, 1956 Pseudosteineria inaequispiculata ( Platonova, 1971 ) Gerlach & Riemann, 1973 = Theristus inaequispiculatus Platonova, 1971 Pseudosteineria longisetis sp. n. Pseudosteineria paramirabilis ( Gerlach, 1955 ) Tchesunov, 1990 = Steineria paramirabilis Gerlach, 1955 = Trichotheristus paramirabilis Wieser, 1959 Pseudosteineria pavo ( Gerlach, 1957 ) Fadeeva, 1986 = Steineria pavo Gerlach, 1957 Pseudosteineria pulchra ( Mawson, 1957 ) Fadeeva, 1986 = Steineria pulchra Mawson, 1957 Pseudosteineria sagittispiculata Fadeeva, 1986 Pseudosteineria scopae ( Gerlach, 1956 ) Wieser, 1959 = Steineria scopae Gerlach, 1956 = Theristus (Pseudosteineria) scopae Wieser, 1959 Pseudosteineria sinica Huang & Li, 2010 Pseudosteineria zhangi Huang & Li, 2010 Pseudosteineria ventropapillata Tchesunov, 2000