Eusiroides yucatanensis McKinney, 1980

White, Kristine N. & Sir, Sally J., 2024, Caribbean Amphipoda (Crustacea) of Panama. Part II: parvorder Hadziidira, ZooKeys 1195, pp. 249-296 : 249

Eusiroides yucatanensis McKinney, 1980

Figs 24 , 30D

Eusiroides yucatanensis McKinney, 1980: 89-93, figs 3, 4; Diaz and Martin 2000: 767.

Material examined.

Panama • 5-7 mm • 1 ♂, 1 ♀, 2 juvenile; Bocas del Toro, Crawl Cay ; 9.2376°N, 82.1438°W; depth 1.5-3 m, among coral rubble, 11 Aug 2021; K.N. White leg.; USNM 1703552 .

Diagnosis.

Pereopods 5-7 basis crenulate; propodus with spine formula 2, 2, 2, 2, and two locking spines. Epimera 1 and 2 smooth, posteroventral corner with acute point; epimeron 3 posterior margin with three serrations. Uropod 3 peduncle 1/2 as long as rami. Telson subtriangular, longer than wide, apices of lobes subacute.

Distribution.

Mexico: Yucatan ( McKinney 1980); Venezuela: Puerto Viejo ( Diaz and Martin 2000); Panama: Bocas del Toro (present study).

Ecology and remarks.

These amphipods are associated with algae and coral rubble at depths of 0-3 m. Panamanian specimens closely resemble previously described specimens and can be easily identified based on the smooth epimera 1 and 2, epimeron 3 having three distinct serrations, and the length of uropod 3 peduncle.

Figures

Figure 24. Eusiroides yucatanensis, male, 6.9 mm, telson, gnathopod 2 propodus medial, gnathopod 2 propodus medial enlarged, setae removed, epimeron 3, uropod 3. Scale bars: 0.5 mm.

Figure 30. Photographs of live specimens unless noted A Gibberosus devaneyi B Gibberosus myersi C Resupinus spinicaudatus (ethanol preserved specimen) D Eusiroides yucatanensis E Nasageneia bacescui F Tethygeneia longleyi. Scale bars: 1.0 mm.