Scina setigera Wagler, 1926

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 : 335

Scina setigera Wagler, 1926

Scina setigera Wagler, 1926: 396–398 , fig. 38; Vinogradov et al., 1996: 206, fig. 84; Brusca & Hendrickx, 2005: 148 (list); Garcia Madrigal, 2007: 138 (list).

? Scina setigera .- Siegel-Causey 1982: 92.

Material examined. TALUD III, St. 25 (25°51’00”N, 109°57’00”W), August 21, 1991, 1F , IK from surface to 200 m ( TD, 2000 m) (ECO-CH-Z-10310).

Eastern Pacific and worldwide distribution. Off Coronado Island (26°10’N, 111°10’W), Mexico ( Brusca & Hendrickx 2005; García Madrigal 2007). East side of Gulf of California (present study; Fig. 4 ). Eastern Atlantic and Indian Ocean (off the Seychelles Islands) (García Madrigal 2007) .

Remarks. A very rare species known from only a few specimens, including the single specimen of the original description (see Vinogradov et al. 1996). The only female collected is an adult ovigerous specimen with three relatively large eggs in the marsupium. The specimen presents the distinctive long setae extending over the pereopod 5 and pereopod 6 dactylus, it has two teeth on the anterior margin of pereopod 5 and, in general, agrees with the expected relative segment proportions of pereopods 1–7, as described and illustrated by Wagler (1926). The specimen is about the same size (3.5 mm) as S. trispina sp. nov. but the eggs present in the marsupium are smaller (0.2 mm) and fewer (only four were observed).

Scina setigera was reported with some doubts (a damaged, immature specimen) by Siegel-Causey (1982) and further records in the region ( Brusca & Hendrickx 2005; García Madrigal 2007) were based on this unique report. The adult ovigerous specimen collected during this survey, however, confirms the presence of this species in the eastern Pacific.

Figures

FIGURE 4. Localities where Scina nana Wagler, 1926, Scina pacifica (Bovallius, 1887), S. setigera Wagler, 1926, and S. submarginata Tattersall, 1906, were captured during this survey.