title: A new genus of Stenetriidae Hansen, 1905 (Asellota: Isopoda: Crustacea) from the Great Barrier Reef, Australia and the southwestern Pacific.
abstract: Onychatrium gen. nov. is described, with five included species: Onychatrium forceps sp. nov., the type species and Onychatrium torosus sp. nov., both from the Great Barrier Reef; Onychatrium entale (Nordenstam, 1946) comb. nov., from Tapateuen (= Tabiteue Island), Gilbert Islands; Onychatrium thomasi (Bolstad & Kensley, 1999) comb. nov., from Madang, Papua New Guinea; and Onychatrium echiurum (Nobili, 1906) comb. nov., and species inquirenda from the Tumaotu Islands, Eastern French Polynesia. The primary distinguishing characters for Onychatrium gen. nov. are a trapezoid pseudosrostrum, the male pereopod 1 with elongate dactylus (4.7-7.3 as long as proximal width), propodus with strongly produced and acute lobe, carpus with a distally acute, flat, ventrally directed process (except O. torosus sp. nov., which has a short and truncate process) and the merus with a distally directed inferodistal lobe. The genus is known only from the southern Pacific, from the Tuamotus (eastern French Polynesia) to the Great Barrier Reef and northern Papua New Guinea.
authors.affiliation: Museum of Tropical Queensland, Queensland Museum, 70-102 Flinders Street, Townsville, Australia 4810. College of Marine and Environmental Sciences, James Cook University; and Water Research Group (Ecology), Unit for Environmental Sciences and Management, North West University, Potchefstroom, 2520, South Africa; Email: niel.bruce@qm.qld.gov.au.
authors.forename: Niel L
authors.initials: NL
authors.lastname: Bruce
authors.affiliation: Museum of Tropical Queensland, Queensland Museum, 70-102 Flinders Street, Townsville, Australia 4810.; Email: unknown.
authors.forename: R L
authors.initials: RL
authors.lastname: Cumming
mesh_terms: D063147:Animal Distribution; D000825:Animal Structures / Q000033:anatomy & histology / Q000254:growth & development; D000818:Animals; D049628:Body Size; D017753:Ecosystem; D005260:Female; D033321:Isopoda / Q000033:anatomy & histology / Q000145:classification* / Q000254:growth & development; D008297:Male; D009929:Organ Size; D010139:Pacific Islands