Nasageneia bacescui Ortiz & Lalana, 1994

White, Kristine N. & Sir, Sally J., 2024, Caribbean Amphipoda (Crustacea) of Panama. Part II: parvorder Hadziidira, ZooKeys 1195, pp. 249-296 : 249

Nasageneia bacescui Ortiz & Lalana, 1994

Figs 25 , 30E

Nasageneia bacescui Ortiz & Lalana, 1994: 285-291, figs 1-5; LeCroy 2007: 512, fig. 451.

Material examined.

Panama • 2.5-5 mm • 1 ♂ Bocas del Toro, Drago ; 9.413433°N, 82.33335°W; depth 1-3 m, among red algae; 23 June 2023; K.N. White leg.; USNM 1703553 • 1 ♂, 2 ♀; Bocas del Toro, Swan Cay; 9.4536°N, 82.300033°W; depth 2 m, among red algae and coral rubble; 24 June 2023; K.N. White leg.; USNM 1703554 .

Diagnosis.

Rostrum narrow, curved, distally acute. Gnathopods 1 and 2 propodus palm each with four spines and several setae. Epimeron 3 posterior margin regularly serrate. Uropod 3 inner ramus slightly shorter than outer ramus Telson cleft ½ of length, lobes not narrowing distally, apically rounded.

Distribution.

U.S.A.: Tampa Bay to the Florida Keys ( Ortiz and Lalana 1996); Cuba: Gulf of Batabano ( Ortiz and Lalana 1994), Cayo Mendoza ( Ortiz and Lalana 1996); Columbia: south of Cartagena ( Ortiz and Lemaitre 1994); Panama: Bocas del Toro (present study).

Ecology and remarks.

These amphipods are associated with algae and coral rubble at depths of 0-4 m. Panamanian specimens closely resemble previously described specimens. This species can be distinguished from the closely related Tethygeneia longleyi based on the narrow, distally acute rostrum, regularly serrate epimeron 3, and wide telson lobes. See LeCroy (2007) for discussion of these species.

Figures

Figure 25. Nasageneia bacescui, female, 3.1 mm, head, telson, epimeron 3, uropod 3; male, 1.9 mm, gnathopods 1 and 2 medial. Scale bars: 0.5 mm.

Figure 30. Photographs of live specimens unless noted A Gibberosus devaneyi B Gibberosus myersi C Resupinus spinicaudatus (ethanol preserved specimen) D Eusiroides yucatanensis E Nasageneia bacescui F Tethygeneia longleyi. Scale bars: 1.0 mm.