Rhabdosoma whitei Spence Bate, 1862

Gasca, Rebeca & Hendrickx, Michel E., 2022, Pelagic amphipods (Crustacea: Amphipoda: Hyperiidea) in western Mexico. 7 Superfamily Platysceloidea. Family Oxycephalidae, Zootaxa 5105 (2), pp. 219-236 : 227-229

Rhabdosoma whitei Spence Bate, 1862

Rhabdosoma whitei Spence Bate, 1862: 345‒346 , pl. LIV, fig. 7; Brusca, 1981: 12 (list), 32 (key), fig. 2c; Siegel-Causey, 1982: 350 (key), 353‒354; Vinogradov et al., 1996: 536 (key), 538-540, fig. 232; García Madrigal, 2007: 158 (list); Guillén Pozo, 2007: 17 (key), 109‒110, fig. 38; Gasca, 2009: 89 (tab. 1); Lavaniegos & Hereu, 2009: 142 (tab. 1),152 (appendix); Gasca et al., 2012: 126 (tab. 1), 133 (tab. 4); Valencia & Giraldo, 2012: 1493 (tab. 1); Lavaniegos, 2014: 3, 5 (tab. 1); 2017: 21; Valencia et al., 2013: 52 (tab. 1); Zeidler, 2016: 79 (passim), fig. 36B, 36A2, 80 (key); Violante-Huerta et al., 2021: 81 (tab. 1), 86, fig. 2E.

Material examined. 45M, 76F, in 20 localities ( Fig. 4 ).

TALUD III. St. 3B (22°36’36”N, 106°35’54”W), August 17, 1991 , 2F, I-K from surface to 275 m (TD, 1585 m) (ICML-EMU-12968-A); St. 5 (23°22’N, 107°10’W), August 24, 1991, 1F, I-K, from surface to 365 m (TD, 698 m) (ICML-EMU-12968-B); St. 10B (23°43’24”N, 107°39’06”W), August 18, 1991, 2M, 1F, I-K from surface to 630 m (TD, ca. 900 m) (ICML-EMU-12968-C); St. 19 (25°12’00”N, 109°07’00”W), August 20, 1991, 1M, 2F, I-K, surface to 410 m (TD, 920 m) (ECOSUR-10561); St. 19B (25°18’24”N, 109°18’36”W), August 20, 1991, 3M, 4F, I-K from surface to 600 m (TD, 1890 m) (ICML-EMU-12969-A); St. 25A1 (25°51’00”N, 109°57’00”W), August 21, 1991, 1M, 1F, I-K from surface to 200 m (TD, 1280‒1360 m) (ICML-EMU-12969-B); St. 25A2 (25°50’54”N, 109°56’54”W), August 21, 1991, 2M, 1F, I-K from surface to 230 m (TD, ca. 1200 m) (ICML-EMU-12969-C). TALUD IV St. 7 (22°00’22”N, 106°49’18”W), August 23, 2000 , 2M, 4F, MN from surface to 500 m (TD, 1970 m) (ICML-EMU-12970-A); St. 15 (23°23’30”N, 107°47’48”W), August 24, 2000 , 3F, MN from surface to 1500 m (TD, 2350 m) (ICML-EMU-12970-B; St. 22 (24°17’20”N, 108°50’30”W), August 26, 2000 , 1M, 3F, MN from surface to 1325 m (TD, aprox. 1800 m) (ICML-EMU-12971-A); St. 29 (24°57’48”N, 109°37’00”W), August 27, 2000 , 1M, MN from surface to 1280 m (TD, 2080 m) (ICML-EMU-12971-B) . TALUD V. St. 5 (22°00’57”N, 106°40’00”W), December 13, 2000 , 1M, 1F, MN from surface to 1400 m (TD> 1600 m) (ICML-EMU-12972-A); St. 29 (25°14’36”N, 109°24’15”W), December 17, 2000 , 1F, MN from surface to 1290 m (TD, 2040 m) (ICML-EMU- 12972-B); St. 36. (25°54’30”N, 110°11’24”W), December 17, 2000 , 1M, 2F, MN from surface to 1340 m (TD, 1990 m) (ICML-EMU-12972-C) . TALUD VI. St. 7 (22°21’39”N, 107°01’42”W), March 14, 2001 , 23M, 45F, MN from surface to 1305 m (TD, 2100 m) (ICML-EMU-12973-A); St. 15 (23°14’42”N, 107°30’00”W), March 14, 2001 , 3M, 2F, MN from surface to 1230 m (TD, 2390 m) (ICML-EMU-12973-B); St. 22 (24°17’34”N, 108°50’25”W), March 15, 2001 , 1M, 2F, MN from surface to 1410 m (TD, 1760 m) (ICML-EMU-12973-C) . TALUD VII. St. 22 (24°21’08”N, 108°55°14” W), June 7, 2001 , 1M, MN from surface to 1415 m (TD, 2000 m) (ICML-EMU- 12974) . TALUD IX, St. 7 (25°11’30”N, 109°41’06”W), November 15, 2005 , 1M, MN, surface to 1510 m (TD, 2377 m) (ICML-EMU-12975-A) . TALUD X, St. 11 (27°34’16”N, 111°40’W), February 11, 2007 , 1M, MN, from surface to 1215 m (TD, 1801 m) (ICML-EMU-12975-B) . TALUD XI. St. 19B (17°56’00”N, 103°10’00”W), June 9, 2007 , 1F, MN from surface to 1200 m (TD, 1995 m) (ICML-EMU-12976-A) . TALUD XII. St. 28B (18°56’00”N, 104°59’57”W), April 2, 2008 , 1M, MN from surface to 1425 m (TD, 2041 m) (ICML-EMU-12976-B) .

Distribution. Tropical and subtropical in the Pacific, Atlantic, and Indian Oceans, from 40°N to 40°S. Mediterranean and Red Seas. In the eastern Pacific from Mexico to Costa Rica, Panama, Colombia, and Ecuador ( Vinogradov et al. 1996, García Madrigal 2007, Valencia & Giraldo 2012, Valencia et al. 2013, Violante-Huerta et al. 2021, this study).

Remarks. One specimen (ICML-EMU-12975-A)was attached to the siphonophore Diphyes bojani (Eschscholtz, 1825) ; although it looked like a natural union, this could be a consequence of the sampling method. Rhabdosoma whitei has been observed previously associated with the ctenophore Beroe sp. ( Harbison et al. 1978).

Mostly from surface to 200 m depth (Vinogradov et al. 1986). An epipelagic species reported as relatively common in the entire Gulf of California ( Siegel-Causey 1982). In the Mexican part of the California Current Rhabdosoma whitei has been consistently reported by Lavaniegos & Hereu (2009) and by Lavaniegos (2014, 2017), but not as a dominant species (present in 12% of the samples; Lavaniegos 2014). Our data indicate that R. whitei is a frequent species throughout the Gulf of California, also recorded off SW Mexico ( Fig. 4 ).

Figures

FIGURE 4. Localities where Rhabdosoma whitei was collected during this survey.