Gibberosus myersi (McKinney, 1980)

Figs 22, 30B

Megaluropus longimerus: Barnard 1962: 103, figs 17o-q (non Megaluropus longimerus Schellenberg, 1925).

Megaluropus sp.: Camp et al. 1977: 17-18.

Megaluropus myersi McKinney, 1980: 93-98, figs 5-7.

Gibberosus myersi: Thomas and Barnard 1986b: 464-469, figs 6, 12; LeCroy 2007: 590.

Gibberosus sp. A: Rakocinski et al. 1993: 102.

Gibberosus cf. myersi: Rakocinski et al. 1996: 350.

Material examined.

Panama • 2-5 mm • 2 ♀; Bocas del Toro, Crawl Cay; 9.237675°N, 82.143833°W; depth 2-3 m, in sand; 11 Aug 2021; K.N. White leg.; USNM 1703548 • 1 ♂, 3 ♀, Bocas del Toro, Drago; 9.413433°N, 82.33335°W; depth 1-3 m, in sand; 23 June 2023; K.N. White leg.; USNM 1703549 • 1 ♂, 8 ♀; Bocas del Toro, Drago; 9.417183°N, 82.324783°W; depth 0-1 m in sand; 27 June 2023; K.N. White leg.; USNM 1703550 .

Diagnosis.

Head ocular lobe with acute cusp. Pleosome segment 3 and urosome segments 1 and 2, with dorsal serrations; urosome segment 2, with one or two dorsal spines. Epimeron 3 serrate. Uropod 3 peduncle with facial spines; rami with sparse marginal spines. Telson each lobe with one dorsal and two apical spines.

Distribution.

U.S.A.: South Carolina to the Florida Keys; southwestern Gulf of Mexico, Tampa Bay, Perdido Key, British Columbia to La Jolla, California (Thomas and Barnard 1986b; Rakocinski et al. 1993, 1996; LeCroy 2007); Peru: Afuera; Costa Rica: Puerto Culebra; Brazil: llha Sao Sebastiao (Thomas and Barnard 1986b); Panama: Culebra Island (Thomas and Barnard 1986b), Bocas del Toro (present study).

Ecology and remarks.

These amphipods are found in sand at depths of 0-29 m. Panamanian specimens closely resemble previously described specimens. See Thomas and Barnard (1986b) for a discussion of the variation in this species. Caribbean Panamanian specimens most closely resemble specimens from Brazil, Peru, Costa Rica, and Queen Charlotte, and Coronados based on having a smooth dorsal margin on pleonites 2 and 5, a thin posterior most facial spine on peduncle of uropod 1, and epimeron 2 without facial spines.