Northernmost discovery of Bathynellacea (Syncarida: Bathynellidae) with description of a new species of Pacificabathynella from Alaska (USA) Author Camacho, A. I. Dpto. Biodiversidad y BiologĂ­a Evolutiva, Museo Nacional de Ciencias Naturales (CSIC), Madrid, Spain; Author Newell, R. L. EcoServices So., Kennewick, WA, USA; Author Crete, Z. Crete Biological Services, Helena, Montana, USA; Author Dorda, B. A. Dpto. de Colecciones. Col. de Tejidos y ADN, Museo Nacional de Ciencias Naturales (CSIC), Madrid, Spain Author Casado, A. Dpto. de Colecciones. Col. de Tejidos y ADN, Museo Nacional de Ciencias Naturales (CSIC), Madrid, Spain Author Rey, I. Dpto. de Colecciones. Col. de Tejidos y ADN, Museo Nacional de Ciencias Naturales (CSIC), Madrid, Spain text Journal of Natural History 2015 2015-07-31 50 583 602 http://dx.doi.org/10.1080/00222933.2015.1083621 journal article 21302 10.1080/00222933.2015.1083621 0b04a6f9-e453-4c9c-b598-5510e15d2af3 1464-5262 3985612 40B851A9-3D7A-45BA-AB77-440E304F9F9C Pacificabathynella Schminke and Noodt, 1988 Amended genus diagnosis (after Schminke and Noodt 1988 and Camacho, Newell, et al. 2009) Antennule 7-segmented and antenna 7- or 8-segmented. Mandible with two teeth on incisor process (pars incisiva), processus incisivus accessorius with one tooth and one seta-like tooth, pars molaris with two bidentated structures, parallel to main axis of the teeth, the most distal tooth very strong with apical denticles. Labrum with a small central protuberance at the distal edge. Thoracopod (Th) VI and VIII sexually dimorphic. Male Th VI with 3-segmented endopod, second segment broad and dilated with strong curved seta at outer margin; first segment also broader than usual. Female Th VI with 4- segmented endopod and setal formula 1+0/0+1/0+0/2(1). Male Th VIII with three lobes around genital opening on coxa and with a tooth-like protuberance, prominence in the basipod, exopod and endopod 1-segmented. Female Th VIII bearing epipod; exopod and endopod 1-segmented, both with two or three apical setae. Endopod of uropod with four to eight strong spines along inner margin. Furcal rami with five spines.