Animalia Amphipoda Lysianassidae WhiteKristine N.Caribbean Amphipoda (Crustacea) of Panama. Part III: parvorder LysianassidiraZookeys24102024121614917110.3897/zookeys.1216.135258 F321EAD3-A4FE-54FC-A33A-C98D209F26BB Concarnes concavus (Shoemaker, 1933)Figs 3, 10C Socarnes concavus Shoemaker, 1933: 247–248, fig. 1; J.L. Barnard 1958: 99; Gurjanova 1962: 304; Ortiz 1979: 19. Concarnes concavus Barnard & Karaman, 1991: 477; Lowry and Stoddart 1997: 58–63, figs 24–26; LeCroy 2007: 576, fig. 493.Material examined.

Panama • 5–6 mm • 1 ♀; Bocas del Toro, Crawl Cay; 9.2475°N, 82.1290°W; depth 5 m, among coral rubble; 12 Aug 2021; K.N. White leg.; USNM 1739775 • 1 ♀; Bocas del Toro, Crawl Cay; 9.2460°N, 82.1369°W; depth 1–4 m, among coral rubble; 25 June 2023; K.N. White leg.; USNM 1739776.

Diagnosis.

Head ocular lobe subacute. Epistome produced, rounded, subequal to produced upper lip. Gnathopod 1 basis slender, elongate; propodus distally narrowing. Gnathopod 2 minutely subchelate. Telson partially cleft, lobes apically rounded.

Distribution.

USA: Santee River, South Carolina (LeCroy 2007); off Sapelo and Little Tybee Islands, Georgia (LeCroy 2007); Dry Tortugas (Shoemaker 1933); Gulf of Mexico from Florida Keys to Panama City (Thomas 1993; Lowry and Stoddart 1997; LeCroy 2007); Belize (Thomas 1993); Panama: Bocas del Toro (Miloslavich et al. 2010; present study).

10.3897/zookeys.1216.135258.figure30105E535-B3D5-5135-8270-AE391B7C0ED3

Concarnesconcavus, female, 6.0 mm, gnathopod 2 lateral, uropod 2, uropod 3, head, epistome, and upper lip, telson, gnathopod 1 medial. Scale bars: 0.5 mm.

https://binary.pensoft.net/fig/1160279Ecology and remarks.

These amphipods are associated with coral rubble and coarse sand at depths of 1–80 m. Panamanian specimens agree closely with previous descriptions of the species. This species is easily recognizable by the subacute ocular lobe, produced epistome and upper lip, and slender, elongate basis of gnathopod 1. Panamanian specimens have a distinct red coloration on the tips of antennae and on the anterior half of the body and have a white snowflake pattern on the posterior half of the body when alive.

10.3897/zookeys.1216.135258.figure10AFB840BC-677F-572F-8152-B742EB1926D0

Photographs of live specimens unless noted AArugaholmesi (ethanol preserved specimen) BBonassabonairensisCConcarnesconcavusDLysianopsishummelinckiELysianopsisozona. Scale bars: 1.0 mm.

https://binary.pensoft.net/fig/1160286BarnardJL (1958) Index to the families, genera, and species of the gammaridean Amphipoda (Crustacea).Allan Hancock Foundation Publications, Occasional Paper19: 1–145.GurjanovaEF (1962) Amphipoda of the northern part of the Pacific Ocean (Amphipoda-Gammaridea). Part 1.Akademiya Nauk SSSR, Opredeliteli po Faune SSSR74: 1–440.OrtizM (1979) Lista de especes y bibliografía de los anfípodos (Crustacea: Amphipoda) del Mediterráneo Americano. Ciencias (La Habana), Series 8, Investigaciones Marinas 43: 1–40.LowryJKStoddartHE (1997) AmphipodaCrustacea IV. Families Aristiidae, Cyphocarididae, Endevouridae, Lysianassidae, Scopelocheiridae, Uristidae.Memoirs of the Hourglass Cruises10: 1–148.LeCroySE (2007) An Illustrated Identification Guide to the Nearshore Marine and Estuarine Gammaridean Amphipoda of Florida Volume 4: Families Anamixidae, Eusiridae, Hyalellidae, Hyalidae, Iphimediidae, Ischyroceridae, Lysianassidae, Megaluropidae, and Melphidippidae. Florida Department of Environmental Protection Annual Report Contract No. WM724 1: 1–195.ShoemakerCR (1933) Amphipoda from Florida and the West Indies.American Museum Novitates598: 1–24.ThomasJD (1993) Identification manual for marine Amphipoda (Gammaridea): I. Common coral reef and rocky bottom amphipods of South Florida. Florida Department of Environmental Protection Final Report Contract No.SP290: 1–83.MiloslavichPDíazJMKleinEAlvaradoJJDíazCGobinJEscobar-brionesECruz-mottaJJWeilECortésJBastidasACRobertsonRZapataFMartínACastilloJKazandjianAOrtizM (2010) Marine biodiversity in the Caribbean: regional estimates and distribution patterns. PLoS ONE 5(8): e11916. https://doi.org/10.1371/journal.pone.0011916