Caribbean Amphipoda (Crustacea) of Panama. Part II: parvorder Hadziidira Author White, Kristine N. https://orcid.org/0000-0002-5203-1656 Georgia College & State University, Department of Biological and Environmental Sciences, Aquatic Sciences Center, Milledgeville, GA 31061, USA kristine.white@gcsu.edu Author Sir, Sally J. https://orcid.org/0000-0002-1270-1192 Georgia College & State University, Department of Biological and Environmental Sciences, Aquatic Sciences Center, Milledgeville, GA 31061, USA text ZooKeys 2024 2024-03-18 1195 249 296 http://dx.doi.org/10.3897/zookeys.1195.116721 journal article http://dx.doi.org/10.3897/zookeys.1195.116721 1313-2970-1195-249 4868E773FA184196B2075A691987CC8C AD46D7C8FCCB5CB4AD7A21EC55516779 Elasmopus pocillimanus (Bate, 1862) Figs 8 , 28A Maera pocillimanus Bate, 1862: 191, pl. 34, fig. 7. Elasmopus pocillimanus : Della Valle 1893 : 733, pl. 1, fig. 4, pl. 22, figs 23-25; LeCroy 2000 : 89, fig. 138. Material examined. Panama • 4-8 mm • 1 ♀ ; Bocas del Toro , Isla Solarte ; 9.2475°N , 82.1290°W ; depth 1-4 m , among coral rubble; 8 Aug 2021 ; K.N. White leg.; USNM 1703512 • 1 ♂ ; Bocas del Toro , Drago; 9.418056°N , 82.3375°W ; depth 2-4 m , among coral rubble; 9 Aug 2021 ; K.N. White leg.; USNM 1703513 • 1 ♀ ; Bocas del Toro , Hospital Point; 9.331967°N , 82.214817°W ; depth 1-3 m , among coral rubble, 22 Jun 2023 ; K.N. White leg.; USNM 1703514 • 1 ♂ ; Bocas del Toro , Swan Cay; 9.4536°N , 82.300033°W ; depth 1-4 m , among coral rubble, 24 Jun 2023 ; K.N. White leg.; USNM 1703515 . Diagnosis. Gnathopod 1 propodus subrectangular, palm transverse. Gnathopod 2 male propodus with deep medial depression, lined with groups of long setae along ventral margin, with one small medial tooth, female propodus with two spines at palmar angle slightly longer than spines on palmar margin. Pereopod 5, basis posterior margin evenly convex. Pereopod 7 basis posteroventral margin with long setae, articles 4 and 5 of male expanded, articles 5 and 6 with long posterior setae. Epimeron 3 posteroventral margin entire, sometimes with small tooth or weakly crenulate. Telson inner lobes longer than outer lobes, apically rounded. Distribution. Cosmopolitan distribution in warm temperate and tropical waters ( McKinney 1977 ; Karaman 1982 ; Thomas 1993 ) most likely refers to multiple species. U.S.A.: New England through Gulf of Mexico and Caribbean ( LeCroy 2000 ); Panama: Bocas del Toro (present study). Ecology and remarks. These amphipods are associated with algae and coral rubble at depths of 0-30 m. Panamanian specimens show variation in the amount of crenulation of epimeron 3 posterior margin, but consistently have rounded apices on the telson. Other characters align well with previous descriptions of E. pocillimanus . See LeCroy (2000) for a discussion of the status of the species. Figure 8. Elasmopus pocillimanus , female, 5.0 mm, telson; male, 6.1 mm, pereopod 7, gnathopod 1 lateral, setae removed from propodus, gnathopod 1 propodus medial enlarged, epimeron 3 (two variations), gnathopod 2 medial. Scale bars: 0.5 mm.