Ensayara laetum, Lowry, James K. & Hughes, Lauren E., 2015

Lowry, James K. & Hughes, Lauren E., 2015, Endevouridae, a review with description of four new species (Crustacea, Amphipoda, Lysianassoidea), Zootaxa 4018 (1), pp. 1-34 : 24-28

Ensayara laetum sp. nov.

( Figs 17–20 )

Type material. Holotype ovigerous female (6 embryos), 6.0 mm, dissected, 5 slides, AM P.18201, off Cape Everard [now known as Point Hicks], Victoria, Tasman Sea (37°48'S, 149°16'E), 130–140 m, trawled, May 1929, coll. H.O. Fletcher (stn VIC-4).

Additional material examined. Eastern Australia. 1 specimen, AM P.69281, west side of Bowen Island, Jervis Bay, New South Wales (35°07'S, 150°46'E), 6 m, coarse shelly sand, 28 June 1981, coll. J.K. Lowry & R.T. Springthorpe (NSW-47); 1 specimen, AM P.69282, off Sow and Pigs, Port Jackson, New South Wales (33°30'S, 151°16'E), 5 m, shelly sand, benthic grab, 30 September 1976, coll. J.K. Lowry & A.R. Jones, “FV Port Jackson ” (NSW-184); 1 specimen, NMV J1130, Western Port, Victoria (38°14.36’S, 145°20.62’E), intertidal, sand, Smith- McIntyre grab, 8 January 1974, coll. Marine Studies Group, Ministry for Conservation, Victoria ( WBES station 1709); 1 male (66 “G”), 3.8 mm, dissected 4 slides, NMV J68168 , 35 km north of Cape Wickham, King Island, central Bass Strait (39°13.6'S 143°55.6'E), 85 m, fine sand, epibenthic sled, 23 November 1981, coll. R. Wilson, RV Tangaroa (stn BSS-205S); 1 male, NMV J68189 , 38 km south-west of Cape Paterson, central Bass Strait (38°56.4'S, 145°16.6'E), 70 m, fine sand, epibenthic sled, 12 November 1981, coll. R. Wilson, RV Tangaroa (stn BSS-155); 1 specimen, NMV J68190 , 43 km south-east of Port Albert, Victoria, eastern Bass Strait (38°53.7'S, 147° 06.5E), 58 m, coarse shell, 18 November 1981, coll. R. Wilson, RV Tangaroa (BSS-177); 1 specimen (indeterminate), NMV J 68191 , 100 km north-east of North Point, Flinders Island, eastern Bass Strait (38°51.8'S, 148°26.5'E), 130 m, fine sand, grab, 15 November 1981, coll. R. Wilson, RV Tangaroa (stn BSS 170G); 5 specimens, NMV J22343 , 11.7 km west of Point Ricardo, Victoria (37°49.89'S, 148°30.13'E), 27 m, coarse sand, Smith-McIntyre grab, 4 June 1991, coll. N. Coleman (stn MSL-EG 77); 1 specimen, NMV J68193 , Dover Jetty, Tasmania (43°19'S, 147°01'E), 3 m, sediment and algae under pier, airlift, 27 April 1985, coll. Robin S. Wilson ( NMV stn TAS-39); 2 specimens, AM P. 69285, 100 m north of Fleurieu Point, Freycinet Peninsula, Tasmania (42°10'S, 148°15'E) 10 m, airlift, coll. S.J. Keable & R.T. Springthorpe, 30 April 1991 (TAS-322).

South Australia: 2 specimens, NMV J68194 , coral reef, Tiparra Reef, Tiparra Bay, South Australia (34°10'S, 137°23'E), 5 m, sand and rubble, 15 March 1985, coll. G.C.B. Poore & H.M. Lew Ton ( NMV SA- 12); 1 ovigerous female, NMV J68195 , coral reef, Tiparra Reef, Tiparra Bay, South Australia (34°10'S, 137°23'E), 5 m, sand and grit, dead seagrass, 15 March 1985, coll. G.C.B. Poore & H.M. Lew Ton ( NMV SA- 13); 1 specimen, NMV J68196 , Tiparra Light, Tiparra Reef, Tiparra Bay, South Australia (34°10'S, 137°23'E), 5 m, sea grass Amphibolus sp. and sand, 15 March 1985, coll. G.C.B. Poore & H.M. Lew Ton ( NMV SA- 16); 2 specimens, NMV J68197 , Tiparra Light, Tiparra Reef, Tiparra Bay, South Australia (34°10'S, 137°23'E), 5 m, sea grass Zostera sp. and coarse rubble, 15 March 1985, coll. G.C.B. Poore & H.M. Lew Ton ( NMV SA- 17); 1 specimen, AM P.69283, Spilsby Island, Spencer Gulf, South Australia (34°40'S, 136°20'E), submarine light, 16 February 1944, coll. K. Sheard (stn SA- 103); 1 specimen, AM P.69284, Cape Donington, Spencer Gulf, South Australia (34°43'S, 135°59'E), submarine light, 12 February 1944, coll. K. Sheard (stn SA- 104).

Western Australia. 3 specimens, AM P97705, north-west of Port Hedland, North West Shelf, Western Australia, eastern Indian Ocean (19°42.0'S 117°57.0'E to 19°41.7'S, 117°57.4'E), 52 m, epibenthic sled, 22 February 1983, FRV Soela ( CSIRO stn NWS 01-B15-S).

Etymology. From the Latin for wonder, joy.

Type locality. Off Cape Everard [now known as Point Hicks], Victoria (37°48'S, 149°16'E).

Diagnosis. Head lateral cephalic lobe subacute. Maxilla 1 palp article 2 with 4 nodular robust setae and 1 slender seta. Maxilliped inner plate with 5 robust setae. Coxae 1 to 3 ventral margin with sparse fine setae. Gnathopod 1 basis anterior margin smooth, not cuspidate. Pereopod 3 carpus posterior margin as long as free proximal margin of propodus, posteroproximal margin produced into an apically rounded hook; propodus palm extremely obtuse, margin weakly convex. Epimeron 3 posteroventral corner subquadrate. Uropod 3 biramous, outer ramus article 2 length 1.5 × width; inner ramus subequal to article 1 of outer ramus. Telson slightly longer than broad, length 1.3 × breadth.

Description of holotype female. Head lateral cephalic lobe subacute, ventral margin straight. Antenna 1 peduncular article 3 hidden in medial view; accessory flagellum 4-articulate; primary flagellum 4-articulate. Mandible incisor convex, margin broadly serrate; palp attached about midway, just proximal to molar, palp article 2 length 1.5 × article 3. Maxilla 1 inner plate with 1 apical seta; outer plate with 10 setal teeth; palp with 4 robust setae and 1 slender setae across distal margin with one subapical seta on medial margin. Maxilla 2 inner plate apically rounded, much shorter than outer plate. Maxilliped inner plate with 5 nodular robust setae; outer plate with 9 embedded nodular setae and 1 slender setae; palp article 4 slender, claw-like, unguis present.

Coxae 1–3 ventral margin with sparse fine setae. Gnathopod 1 simple; basis anterior margin smooth, not cuspidate; carpus length 1.1 × width. Gnathopod 2 minutely chelate. Pereopod 3 chelate; merus length 1.8 × width, 0.9 × carpus length; carpus posterior margin as long as free proximal margin of propodus, posteroproximal margin produced into an apically rounded hook; propodus length 1.9 × width, posteroproximal margin not produced, palm extremely obtuse, margin weakly convex. Pereopods 5–7 basis expanded, posterior margin crenulate. Epimeron 1 posteroventral corner rounded. Epimera 2–3 posteroventral corner subquadrate. Uropod 1 peduncle with 3 lateral and 2 apical robust setae; inner ramus with 3 robust setae; outer ramus with 1 robust seta. Uropod 2 peduncle with 2 lateral and 2 apical; inner ramus with 3 robust setae; outer ramus with 1 robust seta. Uropod 3 peduncle with 3 apical robust setae; inner ramus subequal to article 1 of outer ramus; outer ramus 2-articulate, article 2 length 1.5 × width. Telson slightly longer than broad, length 1.3 × width.

Male sexually dimorphic characters. Pereopod 3 not sexually dimorphic, as per female.

Distribution. Indian Ocean. North West Shelf, King George Sound. Tasman Sea. Jervis Bay, Port Jackson, Western Port, Cape Paterson, Bass Strait, King Island, Flinders Island.

Remarks. See remarks for Ens. evax sp. nov.

Figures

FIGURE 17. Ensayara laetum sp. nov., holotype female, 6.0 mm, habitus, AM P. 18201, Point Hicks, Victoria, Tasman Sea.

FIGURE 18. Ensayara laetum sp. nov., holotype female, 6.0 mm, AM P. 18201, Point Hicks, Victoria, Tasman Sea. Scale 0.1 mm.

FIGURE 19. Ensayara laetum sp. nov., holotype female, 6.0 mm, AM P. 18201, Point Hicks, Victoria, Tasman Sea. Scale 0.1 mm.

FIGURE 20. Ensayara laetum sp. nov., holotype female, 6.0 mm, AM P. 18201, Point Hicks, Victoria, Tasman Sea. Scale 0.1 mm.