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 Quadrimaera ceres (Ruffo, Krapp & Gable, 2000) Figs 11 , 28D Maera ceres Ruffo, Krapp & Gable, 2000: 11-13, figs 4-6. Material examined. Panama • 2-3 mm • 3 ♂ , 5 ♀ ; Bocas del Toro , Drago ; 9.418056 N , 82.3375°W ; depth 3 m , among coral rubble; 9 Aug 2021 ; K.N. White leg.; USNM 1703519 . Diagnosis. Antenna 1 accessory flagellum 7-articulate. Gnathopod 1 coxa anteroventrally rounded; carpus with dorsal depression and two short and four long facial setal rows. Gnathopod 2 propodus palmar margin with shallow U-shaped excavation between two subquadrate projections, palm defined by large projection; dactylus medially expanded, smooth. Telson inner corner acutely produced, each lobe with one medium and three long apical spines. Distribution. Bermuda: St. George's Parish ( Ruffo et al. 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 readily identified based on the gnathopod 2 propodus palm ornamentation. Figure 11. Quadrimaera ceres , male, 3.4 mm, pereopod 7, gnathopod 1 propodus and carpus medial, gnathopod 2 medial, telson, coxa 1. Scale bars: 0.5 mm.