Scina borealis (G.O. Sars, 1882 )

Gasca, Rebeca & Hendrickx, Michel E., 2020, Species of Scina Prestandrea, 1833 (Amphipoda, Hyperiidea, Scinidae) from western Mexico with the description of a new species from the Gulf of California, Zootaxa 4803 (2), pp. 329-344 : 330-332

Scina borealis (G.O. Sars, 1882)

Clydonia borealis Sars, 1882: 76–77 , pl. 3, figs. 1, 1a,b.

Scina borealis .- Siegel-Causey, 1992: 71; Vinogradov et al., 1996: 172, fig. 65; Brusca & Hendrickx, 2005: 147 (list); García- Madrigal, 2007: 136 (list); Zeidler & de Broyer, 2009: 17 (list) (complete synonymy).

Material examined. TALUD I. St. 5 (ca. 23°16’ N, 107°31’W), December 11, 1989, 1F, BO from surface to ca. 200

m ( TD > 1500 m) (ICML-EMU-12450A); St. 6 (23°15’54”N, 107°31’12”W), December 12, 1989, 2M, 4H, BO from surface to ca. 200 m ( TD, 1550 m) (ICML-EMU-12450B). TALUD III. St. 3B (22°36’36”N, 106°35’54”W), August 17, 1991, 2M and 1F, IK from surface to 275 m ( TD, ca. 650 m) (ICML-EMU-12451A); St. 18 (ca. 25°N, 109°W), August 19, 1991, 1F, IK (depth not registered) (ICML-EMU-12451B); St. 19B (25°18’24”N, 109°18’36”W), August 20, 1991, 1F, IK from surface to 600 m ( TD, 1890 m) (ICML-EMU-12451C). TALUD IV. St. 22 (24°17’20”N, 108°50’30”W), August 26, 2000, 1M and 1F, MN from surface to 1325 m ( TD, ca. 1800 m) (ECO-CH-Z-10305); St. 29 (24°57’48”N, 109°37’00”W), August 27, 2000, 1F, MN from surface to 1280 m ( TD, 2080 m) (ICML-EMU- 12452). TALUD V. St. 5 (22°00’57”N, 106°40’00”W), December 13, 2000, 1M, MN from surface to ca. 1400 m ( TD > 1600 m) (ICML-EMU-12453A); St. 29 (25°14’36”N, 109°24’15”W), December 17, 2000, 2F, MN from surface to 1290 m (total depth 2040 m) (ICML-EMU-12453B); St. 36 (25°54’30”N, 110°11’24”W), December 17, 2000, 2M and 1F, MN from surface to 1340 m (total depth 1990 m) (ICML-EMU-12453C). TALUD VI. St. 7 (22°21’39”N, 107°01’42”W), March 14, 2001, 1M and 1F, MN from surface to 1305 m ( TD, 2100 m) (ECO-CH- Z-10306); St. 15 (23°14’42”N, 107°30’00”W), March 14, 2001, 2M, MN from surface to 1230 m ( TD, 2390 m) (ICML-EMU-12454A); St. 22 (24°17’34”N, 108°50’25”W), March 15, 2001, 2F, MN from surface to 1410 m ( TD, 1760 m) (ICML-EMU-12454B); St. 29 (25°16’24”N, 109°24’54”W), March 16, 2001, 1M and 2F, MN from surface to 1440 m ( TD, 2080 m) (ICML-EMU-12454C); St. 36 (25°53’15”N, 110°10’06”W), March 17, 2001, 1F, MN from surface to 1360 m ( TD, 2000 m) (ICML-EMU-12454D). TALUD VII. St. 36 (25°42’37”N, 110°04’35”W), June 9, 2001, 1M, MN from surface to 1390 m ( TD, 2400 m) (ICML-EMU-12455). TALUD X. St. 20 (27°14’41”N, 111°36’15”W), February 13, 2007, 1 M, MN from surface to ca. 1250 m ( TD, 1785 m) (ICML-EMU-12456A); St. 23 St. 23 (27°00’30”N, 111°12’00”W), February 14, 2007, 1F, MN from surface to aprox. 1250 m ( TD, 1770 m) (ICML-EMU-12456B). TALUD XI. St. 6A (16°58’00”N, 100°57’00”W), June 7, 2007, 1 F, MN from surface to 1400 m ( TD, 1960 m) (ICML-EMU-12457A); St. 19B (17°56’00”N, 103°10’00”W), June 9, 2007, 1M and 1F, MN from surface to 1490 m ( TD, 1750 m) (ICML-EMU-12457B). TALUD XII. St. 15C (17°27’51”N, 102°10’43”W), March 31, 2008, 1F, MN from surface to 1530 m ( TD, 1880 m) (ICML-EMU-12458) .

Eastern Pacific and worldwide distribution. Alaska to the west coast of Baja California and the Gulf of California, Mexico; cosmopolitan ( Brusca & Hendrickx 2005; García-Madrigal 2007). Common in temperate and warm-temperate waters around the globe and known as a pan-oceanic species that can be found from the Artic to the Antarctic and all oceans and at depths of 0 to 3000 m ( Vinogradov et al. 1996).

Remarks. One of the most frequently collected species, Scina borealis was found in 21 stations, 19 in the Gulf of California and 3 off SW Mexico ( Fig. 1 ). A total of 38 specimens (15M, 23F) were collected. Specimens of up to 8 mm in length were found in these samples; a single female with its offspring in the marsupium was also obtained (TALUD I, St. 6). This species closely resembles S. wagleri , but uropods are wider and the exopods of both uropod 1 and uropod 2 are reduced to spines in S. borealis .

Figures

FIGURE 1. Localities where Scina borealis (G.O. Sars, 1882) was captured during this survey.