title: A new species of Abyssobrotula (Ophidiiformes, Ophidiidae) from the Kuril-Kamchatka Trench.
abstract: A new abyssal ophidiid fish, Abyssobrotula hadropercularis, is described on the basis of two specimens caught at two stations at ca. 5000 meters of depth in the Kuril-Kamchatka Trench. The genus Abyssobrotula Nielsen, 1977 was previously known from the type species, A. galatheae Nielsen, 1977 of which 40-50 specimens now are reported from all oceans at depths greater than 2000 m. One of the specimens from the Puerto Rico Trench captured at 8370 m is still the deepest record for fishes. The new species differs from A. galatheae in having great number of pectoral-fin rays 14-15 (vs 10-11); greater eye diameter (1.2-1.3% SL vs 0.7-0.9% SL); larger prepelvic 14.0-14.5% SL (vs 10.5-12.5% SL) and preanal lengths 42.5% SL (vs 33.0-41.5% SL); opercular spine strongly developed (vs poorly developed); gill rakers on anterior arch robust and close-set (vs rakers thin and well separated). The description of A. hadropercularis makes it necessary to slightly modify the generic diagnosis.
authors.affiliation: Fisheries Science Center, Hokkaido University Museum, 3-1-1 Minato-cho, Hakodate, Hokkaido 041-8611, Japan. National Research Institute of Far Seas Fisheries, Japan Fisheries Research and Education Agency, 5-7-1 Orido, Shimizu, Shizuoka 424-8633, Japan (present address); Email: shinpei.oha@gmail.com.
authors.forename: Shinpei
authors.initials: S
authors.lastname: Ohashi
authors.affiliation: Natural History Museum of Denmark, Universitetsparken 15, DK-2100 Copenhagen Denmark.; Email: jgnielsen@snm.ku.dk.
authors.forename: Jørgen G
authors.initials: JG
authors.lastname: Nielsen
mesh_terms: D063147:Animal Distribution; D000825:Animal Structures; D000818:Animals; D049628:Body Size; D005260:Female; D005399:Fishes / Q000033:anatomy & histology / Q000145:classification* / Q000254:growth & development; D007564:Japan; D008297:Male; D009929:Organ Size; D010140:Pacific Ocean