Tetragoniceps Brady 1880

GenusTetragonicepsBrady, 1880 Genus diagnosis (modified from Coull 1973). Caudal rami variable, ranging from as wide as long to approximately 10 times longer than wide. Body subcylindrical. Rostrum small or absent. A 1 female 8 - or 9 - segmented, with first segment elongate, and with dentiform projection pointing medially or laterally. Exopodite A 2 well developed, with 2 or 3 setae. Endopodite of maxillule well developed. Maxilla with 3 to 5 endites, and with allobasis bearing a claw-like spine. Mandible bearing pars incisiva with dentations, with both exopod and endopod 1 - or 2 - segmented. Maxilliped subchelate, with basis bearing no more than 2 setae. P 1 to P 4 with 2 - segmented endopodites and 3 - segmented exopodites; setal formulae variable. Female P 5 confluent or distinct. Setation on female P 5 variable. Where known, male P 5 distinct. Sexual dimorphism in P 2 or P 2 and P 3, or caudal rami. Male A 1 7 - to 9 - segmented, with or without dentiform projection. Type species. T. malleolatus (Brady, 1880) Other species. T. dubia Thompson & A. Scott, 1903, T. scotti Sars, 1911, T. brevicauda T. Scott, 1900, T. truncata Nicholls, 1940, T. longicaudata Nicholls, 1940, T. arenicolus Krishnaswamy, 1957, T. bergensis Por, 1965, T. brownei Wells, 1967, T. prima (Coull, 1971), T. bookhouti Coull, 1971, T. unguis Wells & Rao, 1987, T. galapagoensis Mielke, 1989, T. santacruzensis Mielke, 1997, T. pacificus Burgess, 1998.