The Tryphosa group (Crustacea: Amphipoda: Lysianassoidea: Lysianassidae: Tryphosinae) Author Kilgallen, N. M. Author Lowry, J. K. text Zootaxa 2014 2014-02-28 3768 5 501 545 journal article 5767 10.11646/zootaxa.3768.5.1 4c0b59ec-84a8-4daa-8467-3ac34e86ecd6 1175-5326 4909684 FACF814C-3221-44CF-9DED-4B808F186C64 Thrombasia J.L. Barnard, 1966 Thrombasia J.L. Barnard, 1966: 72 .― Ledoyer, 1986: 810 . Schisturella .― Barnard & Karaman, 1991: 526 (in part). Type species. Thrombasia tracalero J.L. Barnard, 1966 , original designation. Included species. Thrombasia includes six species: T. evalina sp. nov. ; T. grabenis J.L. Barnard, 1967 ; T. rotundata (K.H. Barnard, 1926) ; T. saros sp. nov. ; T. tracalero J.L. Barnard, 1966 ; T. umina sp. nov. Diagnostic description. Antenna 1 flagellum article 1 lacking robust seta on distal margin; accessory flagellum forming cap. Antenna 2 flagellum articles 3–5 slender in female, article 3 enlarged in male; articles 3–5 with brush setae on the anterior margin. Mandibular incisor curved; molar a reduced column with convex triturating surface or proximally setose and distally triturating; palp attached midway. Maxilla 1 ST-7 serrate along the distomedial medial margin; ST-D slender, apically cuspidate. Maxilliped outer plate apical robust setae present. Gnathopod 1 subchelate; coxa slightly to greatly shorter than coxa 2, tapering distally; carpus slightly longer than propodus; propodus palm acute, straight. Pereopod 4 coxa with well developed posteroventral lobe. Uropod 2 inner ramus constricted. Uropod 3 rami plumose setae absent in female, present occasionally in adult male. Telson moderately cleft. Remarks. The genus Thrombasia was established by Barnard (1966) for T. tracalero , and was subsequently placed in the synonymy of Schisturella by Barnard & Karaman (1991) . However, we consider Thrombasia to be distinct from Schisturella based on the gnathopod 1 coxa, which is tapering and slightly reduced, not vestigial as in Schisturella . There are four other genera in the Tryphosa group with a gnathopod 1 coxa that is not vestigial. Of these, Thrombasia may be separated from Gronella by the gnathopod 1 carpus, which is longer than the propodus, from Tryphosa and Bruunosa in the tapering gnathopod 1 coxa, and from Glorieusella in the subchelate gnathopod 1. Distribution. Pacific Ocean, South Atlantic Ocean.