Aruga holmesi J. L. Barnard, 1955

Figs 1, 10 A

Aruga holmesi J. L. Barnard, 1955: 100, pls 27, 28; J. L. Barnard 1958: 90; J. L. Barnard 1959: 18; Gurjanova 1962: 299–301, figs 98, 99; J. L. Barnard 1964: 79, chart 1; Barnard and Karaman 1991: 469; Lowry and Stoddart 1997: 47–53, figs 17–20; LeCroy 2007: 575, fig. 497.

Lysianopsis holmesi: Hurley 1963: 74, 75, fig. 21 b.

Lysianassa holmesi: J. L. Barnard 1966 a: 25; J. L. Barnard 1966 b: 69; J. L. Barnard 1979: 12, 130; Austin 1985: 600; Stepien and Brusca 1985: 97–101, fig. 2 F; Stretch 1985: 129–133.

Material examined.

Panama • 4.8 mm • 1 ♀; 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 1739772 .

Diagnosis.

Upper lip projecting well beyond epistome; epistome concave. Gnathopod 1 propodus posterodistal margin slightly concave. Epimeron 3 posteroventral corner subquadrate, without tooth. Uropod 3 peduncle length at least 2 × width. Telson distal margin truncate, slightly emarginate, with two short setae on each side.

Distribution.

USA: Folly Island, South Carolina; Florida from Perdido Key to the lower Florida Keys (LeCroy 2007); Pacific California (Lowry and Stoddart 1997); Ecuador (Lowry and Stoddart 1997); Panama: Pacific side of Isthmus of Panama (Lowry and Stoddart 1997); Bocas del Toro (present study).

Ecology and remarks.

These amphipods are associated with coral rubble and seagrass beds at depths of 1.5– 120 m. Panamanian specimens agree closely with previous descriptions of the species. Lowry and Stoddart (1997) recorded this species from the Gulf of Mexico for the first time, noting that it was previously only known from the Pacific side of the Isthmus of Panama. Panamanian specimens are white in color when alive.