Copepods of the family Dirivultidae (Siphonostomatoida) from deep­sea hydrothermal vent fields on the Mid­Atlantic Ridge at 14 ºN and 5 ºS Author Ivanenko, Viatcheslav N. Author Arbizu, Pedro Martínez Author Stecher, Jens text Zootaxa 2006 1277 1 21 journal article 10.5281/zenodo.173351 45dfc44f-f3cf-4044-9b4a-1953ee258c45 1175­5326 173351 Rimipontius mediospinifer Humes, 1996 Material examined. 2 ΨΨ, Mid­Atlantic Ridge, Logachev­1 hydrothermal field, IRINA II site, sample 35­ GTV , 14°45.19’N , 44°58.75’W , depth 3019 m , washing from Bathymodiolus puteoserpentis , 25 January 2004 ( Fig. 1 A). Differential diagnosis. Dorsal surface of genital female double­somite with stout median crest ending with spiniform posterior process. Caudal rami with 5 setae, innermost terminal seta absent. Maxilla with inner sinuous seta. Endopod of leg 4 is 2­segmented and armed with 1 terminal spine (formula 0­0; I,0). Remarks. The species is the type and only species of the genus Rimipontius Humes, 1996 . It was previously recorded from the Logachev field ( Humes & Segonzac 1998 ), in washings of Rimicaris from Snake Pit site ( Humes 1996 ) and in plankton over the Broken Spur ( Ivanenko 1998 ).