Figorella angulosa, Lowry & Stoddart, 2012

Lowry, J. K. & Stoddart, H. E., 2012, The Pachynidae fam. nov. (Crustacea: Amphipoda: Lysianassoidea) 3246, Zootaxa 3246 (1), pp. 1-69 : 22-23

Figorella angulosa sp. nov.

( Figs 14 , 15 )

Type material. HOLOTYPE, female, ovigerous (2 eggs), 3.2 mm, AM P.46668, east of Merimbula , New South Wales, Australia, 36°56.2'S 150°23.00'E to 36°57.00'S 150°22.5'E, 1600 m, epibenthic sled, 12 December 1986, R. T. Springthorpe, RV Franklin, stn FR1086-08 . PARATYPES: 1 female, ovigerous (2 eggs), MV J62421 , south of Point Hicks , Victoria, Australia, 38°19.60'S 149°24.30'E to 38°19.00'S 149°27.30'E, 930–951 m, rock, rubble, clay, sand and biogenic sediment, epibenthic sled, 23 July 1986, M.F. Gomon et al., RV Franklin , stn SLOPE 33 ; 2 juveniles, MV J62420 , south of Point Hicks , Victoria, Australia, 38°21.90'S 149°20.00'E to 38°21.40'S 149°20.90'E, 1000 m, epibenthic sled, 23 July 1986, G.C.B. Poore et al., RV Franklin , stn SLOPE 32 .

Etymology. The specific name angulosa refers to the shape of epimeron 3.

Diagnostic description. Head lateral cephalic lobe large, narrowly rounded; ventral margin curved. Antenna 1 peduncular article 1 without posterodistal spine; accessory flagellum 2-articulate, article 1 short; flagellum without callynophore in female, [male not known]. Mandible lacinia mobilis a simple robust seta; lamina dentata absent; accessory setal row present, not on raised setose ridge; molar absent; palp article 2 broad, longer than article 3; article 3 with both margins slightly convex. Maxilla 1 outer plate with 9 setal-teeth in 6/3 arrangement, some outer row setal-teeth with medial cusps; palp well developed, 1-articulate, with apical slender setae. 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 1.8 × breadth, posterior margin well developed, palm with produced corner, posterodistal corner of palm not attenuated, 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 without posteroproximal shoulder. Pereopod 6 basis with posteroventral lobe weakly produced; merus longer than broad, without posteroproximal shoulder. Pereopod 7 basis subovate with posterior margin weakly dentate. Oostegites from gnathopod 2 to pereopod 5. Epimeron 3 posterior margin with a strong, rounded projection, posteroventral corner subquadrate. Uropod 3 biramous, inner ramus extending less than halfway along outer ramus. Telson shorter than broad, entire.

Remarks. Figorella angulosa and F. franklin both have a 1-articulate palp on maxilla 1 and the corner of gnathopod 1 palm not attenuated. They differ in that F. angulosa has 9 setal-teeth on the outer plate of maxilla 1 and uropod 3 inner ramus slightly shorter than article 1 of the outer ramus, whereas F. franklin has 10 setal-teeth on the outer plate of maxilla 1 and uropod 3 inner ramus longer than article 1 of the outer ramus.

Distribution. South-eastern Australia, Tasman Sea; 930–1000 m depth.

Figures

FIGURE 14. Figorella angulosa sp. nov. Holotype female, 3.2 mm, AM P.46668, off Merimbula, New South Wales, Australia. Scales represent 0.1 mm.

FIGURE 15. Figorella angulosa sp. nov. Holotype female, 3.2 mm, AM P.46668, off Merimbula, New South Wales, Australia. Scales represent 0.1 mm.