A review of the scopelocheirid amphipods (Crustacea, Amphipoda, Lysianassoidea), with the description of new taxa from Australian waters Author Kilgallen, Niamh M. Australian Museum Research Institute, 6 College Street, Sydney, NSW 2010, Australia niamh.kilgallen@austmus.gov.au Author Lowry, James K. Australian Museum Research Institute, 6 College Street, Sydney, NSW 2010, Australia text Zoosystematics and Evolution 2015 2015-03-05 91 1 1 43 http://dx.doi.org/10.3897/zse.91.8440 journal article http://dx.doi.org/10.3897/zse.91.8440 1860-0743-1-1 CAFFC884904F40C2AACF12BE3A2F3ECC FF8CFFC4FFA2166F883BFF8BFFE31C49 575740 Paracallisoma coecum (Holmes, 1908) Figure 24 Scopelocheirus coecus Holmes, 1908: 500, figs 10-12. - Shoemaker 1945 : 186 (in part, part? Paracallisoma platepistomum ). - J.L Barnard 1954 : 54, figs 4, 5. - Gurjanova 1951 : 241 (key). Paracallisoma coecum . - Hurley 1963 : 61, fig. 18. - Barnard and Karaman 1991 : 511. - Thurston 2001 : 685 (table 2). Paracallisoma coecus . - J.L. Barnard 1958 : 97 (list). - J.L. Barnard 1964 : 319, fig. 3. - Brusca 1967 : 384, 385, table 4. - Childress and Nygaard 1974 : 228, table 1. - Childress 1975 : 788 (table 1a). - Quetin et al. 1980 : table 1. - Smith and Baldwin 1982 : 292 (table 3). - Austin 1985 : 601. - Vermeer and Devito 1988 : 65, 67, table 2. - Ikeda 2013 : 342 (table 1). Paracallisoma alberti . - Birstein and Vinogradov 1955 : 223, 279 (in part). - Birstein and Vinogradov 1958 : 228. - Birstein and Vinogradov 1960 : 176, fig. 5, 233, fig. 33. - Gurjanova 1962 : 309, fig. 102. - Nagata 1963 : 1. - Birstein and Vinogradov 1970 : table 1, table 3. - Hatch 1983 : 194, 195, table 3. - Nysewander 1983 : 328, table 7. - Hatch 2013 : 275. Type material. Holotype, female, 20 mm, USNM 38538. Type locality. Off San Clemente Island, California, United States, 1196-1287 m depth. Depth range. 549-4023 m ( Shoemaker 1945 , Barnard 1964 ). Some depth records (e.g. 0-9000 m, Birstein and Vinogradov (1958) ) are excluded from this range as exact depth of capture is unknown due to the sampling technique. Distribution. Pacific Ocean : off San Clemente Island, California, United States ( Holmes 1908 ); Pacific City, Oregon, United States (from the stomach of a duck) ( Shoemaker 1945 ); San Nicolas Basin and off Santa Barbara Island, California, United States ( Barnard 1954 ); outer Santa Barbara Passage, California, United States ( Hurley 1963 ); off Kamchatka, Russia ( Shoemaker 1945 , Gurjanova 1962 ); Gulf of Alaska ( Barnard 1964 ); Kuril-Kamchatka Trench ( Birstein and Vinogradov 1958 ); near the Tenji Seamount, south-south-west of the Aleutian Trench ( Birstein and Vinogradov 1958 ); near the Makarov Seamount ( Birstein and Vinogradov 1960 ); Japan Trench ( Nagata 1963 ). Figure 24. Distribution of Paracallisoma coecum (Holmes, 1908). Circles (●) represent records of Paracallisoma coecum ; squares (■) represent misidentifications of Paracallisoma alberti that may represent Paracallisoma coecum or another species. Star indicates type locality. Discussion. Schellenberg (1926) first considered Paracallisoma coecum to be a junior subjective synonym of Paracallisoma alberti , a move that was accepted by many subsequent authors. However, Barnard (1964) , and many more recent works (e.g. Thurston 1990 , Barnard and Karaman 1991 , Thurston et al. 2001 ) have again treated Paracallisoma coecum as a valid species, a decision with which we agree. Paracallisoma coecum can be differentiated from Paracallisoma alberti by following characters: gnathopod 1 coxa much longer than wide, margins slightly tapering distally (coxa slightly longer than wide, margins subparallel in Paracallisoma alberti ); gnathopod 1 propodus margins tapering distally (gnathopod 1 propodus margins subparallel in Paracallisoma alberti ); gnathopod 2 propodus subovate, palm transverse to slightly acute, dactylus fitting palm (gnathopod 2 propodus diverging distally, palm acute, dactylus shorter than palm in Paracallisoma alberti ). Due to its taxonomic history, many records of Paracallisoma coecum have erroneously been attributed to Paracallisoma alberti . Pacific Ocean material reported as Paracallisoma alberti has now been confirmed as or is presumed to be Paracallisoma coecum ( Thurston 1990 ). According to Thurston (1990) , the record of Shoemaker (1945) of Paracallisoma coecum (as Scopelocheirus coecus ) from Bermuda is referable to Paracallisoma platepistomum Andres, 1977. Indian Ocean material recorded as Paracallisoma alberti is unconfirmed.