Sheardella tangaroa Lowry, 1984

Lowry, J. K. & Stoddart, H. E., 2012, The Pachynidae fam. nov. (Crustacea: Amphipoda: Lysianassoidea) 3246, Zootaxa 3246 (1), pp. 1-69 : 58-59

Sheardella tangaroa Lowry, 1984

( Fig. 41 )

Sheardella tangaroa Lowry, 1984: 61 , figs 4–6. ― Barnard & Karaman, 1991: 530. ― Springthorpe & Lowry, 1994: 33. ― Lowry & Stoddart, 2003: 170.

Material examined. One specimen, AM P.46680, south-east of Lakes Entrance, Victoria, Australia, 37°55.6'S 148°15.1'E, 41 m, epibenthic sled, 25 August 1994, P.B. Berents, RV Southern Surveyor, stn SS 05/94/41. – 1 specimen, MV J13720 , Crib Point, Western Port, Victoria, Australia, 38°21'S 145°14'E, plankton, 25 March 1968, R. H. Miller. – 1 specimen, MV J13721 , Crib Point , Western Port , Victoria, Australia, 38°21'S 145°14'E, 5 m, Smith- McIntyre grab, 14 July 1964, stn CPBS A1 . – 1 specimen, AM P. 46679, 100 m north of Fleurieu Point , Freycinet Peninsula , Tasmania, Australia, 42°10'S 148°15'E, 10 m, green algae and Halophila , airlift, 30 April 1991, S.J. Keable & R. T. Springthorpe , stn TAS-322. – 1 female, AM P.55029, south-west of Port Pirie , Upper Spencer Gulf , South Australia, 33°12’S 137°48’E, subtidal beds of seagrass, Posidonia sinuosa , February 1980, T. Ward , stn 801- C4/8. – 1 specimen, AM P.39239, 2 km south-east of South Point , Two Peoples Bay , Western Australia, 34°58'S 118°12'E, 14 m, Caulerpa bases and fine sand, 16 December 1983, J.K. Lowry, stn WA-178 .

Diagnostic description. Head lateral cephalic lobe large, broadly 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, on raised setose ridge (weak); molar absent; palp attached midway; palp article 2 broad, longer than article 3; article 3 with anterior margin convex, not tapered distally. Maxilla 1 outer plate with 11 setal-teeth in 7/4 arrangement, outer row setal-teeth with lateral and medial cusps; palp vestigial, 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 2.5 × breadth, posterior margin well developed, palm with produced corner, corner of palm with complex robust seta; dactylus over-reaching palm. Gnathopod 2 palm large, 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, with posteroproximal shoulder. Pereopod 7 basis subovate with posterior margin weakly dentate. Oostegites from gnathopod 2 to pereopod 5. Epimeron 3 posterior margin without projections, posteroventral corner broadly rounded. Uropod 3 uniramous. Telson shorter than broad, entire.

Remarks. These are the first records of S. tangaroa outside the type locality, Western Port, Victoria.

Distribution. Southern Australia; 3–41 m depth.

Figures

FIGURE 41. Sheardella tangaroa Lowry, 1984. Paratype, 5.0 mm, AM P.34114, Western Port, Victoria, Australia. Scale represents 0.1 mm.