Ekelofia eltanin, Lowry & Stoddart, 2012

Lowry, J. K. & Stoddart, H. E., 2012, The Pachynidae fam. nov. (Crustacea: Amphipoda: Lysianassoidea) 3246, Zootaxa 3246 (1), pp. 1-69 : 19

Ekelofia eltanin sp. nov.

( Figs 11–13 )

Ekelofia eltanin De Broyer et al., 2007: 157 (nomen nudum).

Type material. HOLOTYPE, male, 6.4 mm, USNM 1157176 , Ross Sea , Southern Ocean, 76°02.1'S 179°57.0'W to 76°02.3'S 179°52.1'W, 347–358 m, Menzies trawl, 9 February 1972, USARP Eltanin cruise 51, stn 5762 . PARATYPE, female, 11.0 mm, MV J38223 , Fram Bank , north-west of Cape Darnley, Antarctica, 67°31.72'S 69°02.13'E to 67°31.93'S 69°02.02'E, 105–114 m, epibenthic sled, 13 February 1993, M. O'Loughlin, RSV Aurora Australis , stn AA93-130 .

Diagnostic description. Head lateral cephalic lobe large, broadly rounded; ventral margin curved. Antenna 1 peduncular article 1 with posterodistal spine; accessory flagellum 2-articulate, article 1 short; flagellum without callynophore in female, with strong 1-field callynophore in male. Mandible lacinia mobilis a simple robust seta; lamina dentata absent; accessory setal row absent; molar absent; palp attached distally; palp article 2 broad, as long as article 3; article 3 not distally tapered, with anterior margin convex. Maxilla 1 outer plate with 8 setal-teeth in 5/3 arrangement, setal-teeth smooth; palp absent. Maxilliped inner plate small; outer plate large; palp 4-articulate, article 4 large. Gnathopod 1 chelate; ischium smaller than propodus, not swollen posteroproximally; carpus extremely compressed; propodus length about 1.6 × breadth, with a vertical row of setae on medial face, posterior margin well developed, palm with produced corner, corner of palm with simple robust seta; dactylus reaching to corner of palm. Gnathopod 2 palm minute, obtuse. Pereonite 4 without dorsal spines. Pereonite 5 without dorsal spines. Pereopod 5 merus with posteroproximal shoulder. Pereopod 6 basis with posteroventral lobe produced beyond ischium; merus as broad as long, with posteroproximal shoulder. Pereopod 7 basis subrectangular with posterior margin weakly dentate. Epimeron 3 posterior margin without projections, posteroventral corner broadly rounded. Uropod 3 biramous, inner ramus extending beyond article 1 of outer ramus. Telson as long as broad, entire.

Etymology. Named for the RV Eltanin, which made many fine collections of lysianassoid amphipods from the waters surrounding Antarctica; used as a noun in apposition.

Remarks. Ekelofia eltanin differs from E. oculata in: the number of setal-teeth on maxilla 1 outer plate; the presence of small inner plates on the maxilliped; the vertical row of medial setae on gnathopod 1 propodus; the more strongly defined posteroproximal shoulder on the merus of pereopods 5 and 6; and the relatively longer telson.

Distribution. Ross Sea and Fram Bank, Antarctica; 105–358 m depth.

Figures

FIGURE 11. Ekelofia eltanin sp. nov. Holotype male, 6.4 mm, USNM 1157176, Ross Sea, Antarctica.

FIGURE 12. Ekelofia eltanin sp. nov. Holotype male, 6.4 mm, USNM 1157176, Ross Sea, Antarctica. Scales represent 0.1 mm.

FIGURE 13. Ekelofia eltanin sp. nov. Holotype male, 6.4 mm, USNM 1157176, Ross Sea, Antarctica. Scales represent 0.2 mm.