Amphithyrus muratus Volkov, 1982

Gasca, Rebeca, Suárez-Morales, Eduardo & Hendrickx, Michel E., 2021, Hyperiids (Amphipoda, Hyperiidea) collected during the TALUD cruises in western Mexico. 5. Family Amphithyridae, with the description of a new species of Amphithyropsis Zeidler, Zootaxa 5039 (4), pp. 479-494 : 482-483

Amphithyrus muratus Volkov, 1982

Amphithyrus muratus Volkov, 1982 in Vinogradov et al., 1982: 464, fig. 248; Vinogradov et al., 1996: 571, fig. 248; Gasca, 2009: 90 (list), 91; Gasca et al., 2012: 126 (tab. 1); Valencia & Giraldo, 2012: 1493 (tab. 1); Zeidler, 2016: 32, 33 (key).

Material examined. 5M, 6F from 8 stations ( Fig. 2 ). TALUD III. St. 3B (22°36’36”N, 106°35’54”W), August 17, 1991, 1M, I-K from surface to 275 m (TD, ca. 650 m) (ICML-EMU-12876). TALUD IV. St. 7 (22°00’22”N, 106°49’18”W), August 23, 2000, 1M, 1F, MN from surface to 500 m (TD, 1970 m) (ECO-CH-Z-10542); St. 15 (23°23’30”N, 107°47’48”W), August 24, 2000, 1F, MN from surface to 1500 m (TD, 2350 m) (ICML-EMU-12877- A); St. 25A2 (24°54’N, 108°59’W), August 26, 2000, 1M, BS from surface to ca. 800 m (ICML-EMU-12877-B). TALUD VI. St. 7 (22°21’39”N, 107°01’42”W), March 14, 2001, 1F, MN from surface to 1305 m (TD, 2100 m) (ICML-EMU-12878-A); St. 22 (24°17’34”N, 108°50’25”W), March 15, 2001, 1M, MN from surface to 1410 m (TD, 1760 m) (ICML-EMU-12878-B); St. 29 (25°16’24”N, 109°24’54”W), March 16, 2001, 2F, MN from surface to 1440 m (TD, 2080 m) (ICML-EMU-12878-C). TALUD VII, St. 36 (25°42’37”N, 110°04’35”W), June 9, 2001, 1M, 1F, MN from surface to 1390 m (TD, 2400 m) (ICML-EMU-12879) .

Distribution. Pacific Ocean, in the Kuroshio Current and near Nasca Ridge ( Vinogradov et al. 1996). In the eastern Pacific from the Gulf of California (north to 25°42’37”N) to off Gorgona Island, Colombia, and in the vicinity of the Nasca Ridge ( Vinogradov et al. 1996, Valencia & Giraldo 2012, present study).

Remarks. Found at eight localities during this study although always in very low numbers, A. muratus had not been reported previously from the Gulf of California or from western Mexico. It features a remarkably wide distribution range, with the original description referring to material from the North Pacific (Kuroshio Current) and off Chile (Nasca Ridge). Considering present records and the material reported by Valencia & Giraldo (2012) off Gorgona Island, about 28 km off the coast of Colombia, A. muratus appears to occur consistently in the eastern

Pacific.

Figures

FIGURE 2. Localities where Amphithyrus muratus and A. sculpturatus were captured during this survey.