Caribbean Amphipoda (Crustacea) of Panama. Part III: parvorder Lysianassidira Author White, Kristine N. 0000-0002-5203-1656 Aquatic Sciences Center, Department of Biological and Environmental Sciences, Georgia College & State University, Milledgeville, GA 31061, USA text ZooKeys 2024 2024-10-24 1216 149 171 journal article 10.3897/zookeys.1216.135258 67B6C273-62C5-4F89-AE63-316B73D65D55 Orchomenella thomasi Lowry & Stoddart, 1997 Figs 9 , 11 D Orchomenella thomasi Lowry & Stoddart, 1997: 109–113 , figs 52–53; LeCroy 2007: 586 , fig. 502. Material examined. Panama • 1.5 mm • 1 ♀ ; Bocas del Toro , Cayo Zapatilla 1; 9.2700°N , 82.0587°W ; depth 10–11 m , among coral rubble ; 28 June 2023 ; K. N. White leg.; USNM 1739787 . Diagnosis. Head ocular lobe subtriangular. Gnathopod 1 carpus shorter than propodus. Epimeron 3 posteroventral corner acute. Urosomite 1 with dorsodistally acute carina. Uropod 3 inner ramus bare; outer ramus 2 - articulate. Distribution. USA : from Sanibel Island, Florida to Louisiana ( Lowry and Stoddart 1997 ; LeCroy 2007 ); Panama : Bocas del Toro (present study). Figure 9. Orchomenella thomasi , female, 1.5 mm, head, epimeron 3 and urosome, gnathopod 1 lateral. Scale bars: 0.5 mm. Ecology and remarks. These amphipods are associated with sand and coral rubble at depths of 10– 73 m. Panamanian specimens closely resemble previously described specimens. Panamanian specimens are white in color when alive. Figure 10. Photographs of live specimens unless noted A Aruga holmesi (ethanol preserved specimen) B Bonassa bonairensis C Concarnes concavus D Lysianopsis hummelincki E Lysianopsis ozona . Scale bars: 1.0 mm. Figure 11. Photographs of live specimens unless noted A Shoemakerella cubensis (ethanol preserved specimen) B Shoemakerella lowryi C Lepidepecreum magdalenensis (ethanol preserved specimen) D Orchomenella thomasi (ethanol preserved specimen). Scale bars: 1.0 mm.