Nagada uwedoae Lowry & Stoddart, 1995

Lowry, J. K. & Stoddart, H. E., 2009, Uristidae *, Zootaxa 2260 (1), pp. 908-918 : 915-917

Nagada uwedoae Lowry & Stoddart, 1995

( Figs 5 , 6 )

Nagada uwedoae Lowry & Stoddart, 1995: 154 , figs 34–36. –– Lowry & Stoddart, 2003: 282 (catalogue).

Type locality. Outer Barrier between Dam Awan (Rasch Passage) and Wongad Island, Astrolabe Bay, Papua New Guinea ( 5°08.59’S 145°49.65’E), 290 m depth .

Material examined. 1 ovigerous female, AM P69472 (JML 81/26-11-4); 48 specimens AM P69474 (QLD 630) ; 3 specimens AM P69475 (QLD 631) ; 1 specimen AM P69476 (QLD 671) ; 22 specimens AM P69477 (QLD 673) ; 16 specimens AM P69478 (QLD 748) ; many specimens AM P69480 and 1 female, AM P78943 (QLD 766) ; many specimens, AM P69479 (QLD 767) ; many specimens, AM P69481 (QLD 775) ; 5 specimens, AM P50744 (QLD 952) ; 11 specimens, AM P51116 and 2 specimens, AM P52655 (QLD 953) ; 127 specimens, AM P51120 and 8 specimens, AM P58342 (QLD 954) ; 285 specimens, AM P50746 (QLD 955/ SEAS) ; 28 specimens, AM P57616 (QLD 1055) ; 11 specimens, AM P50754 (QLD 1073) ; 16 specimens, AM P51123 (QLD 1075) ; 105 specimens, AM P50757 (QLD 1076) ; 154 specimens, AM P51121 (QLD 1078) ; 8 specimens, AM P50760 (QLD 1093) ; 45 specimens, AM P50762 (QLD 1096).

Description. Based on ovigerous female ( 2 eggs), 2.5 mm, AM P69472 and female, 3.2 mm, AM P78943.

Head and body. Body without dorsal carina. Head lateral cephalic lobes rounded, with apically rounded margins; eyes ovate. Antenna 1 subequal to antenna 2; peduncle article 1 not produced, peduncular article 1 without anterodistal lobe, without posterodistal spine; article 2 short, without anterodistal lobe or posterodistal spine; article 3 short; flagellum with weak 2-field callynophore, robust setae absent on proximal articles, calceoli absent; accessory flagellum with 3 articles. Antenna 2 less than 40% of body length; peduncle without brush setae, calceoli absent. Epistome / upper lip fused, weakly sinuous. Mandible molar a setose tongue; palp attached midway, article 3 without A3-setae. Maxilla 1 outer plate with setal-teeth in 7/4 crown arrangement (see Remarks); setal-tooth 7, left and right symmetrical, cuspidate distally; palp distal margin with apical robust setae and serrations. Maxilliped inner plates poorly developed, not reaching half the length of the outer plate; outer plates without apical robust setae; palp 4-articulate, article 4 well developed.

Pereon. Gnathopod 1 simple; coxa large, about as long as coxa 2, subrectangular with straight anterior margin; basis without setae along anterior margin; ischium long (length 2.4 x breadth); carpus long (length 2.2 x breadth), distinctly longer than propodus, without posterior lobe; propodus margins tapering; dactylus complex, with 2 large subterminal spines and row of short spines along posterior margin. Gnathopod 2 chelate; carpus longer than (1.7 x) propodus; palm obtuse; dactylus minute. Pereopod 4 coxa with well developed posteroventral lobe. Pereopod 5 coxa equilobate; basis distinctly longer than broad. Pereopod 7 basis posterodistally produced.

Pleon. Epimeron 3 posterodistal corner rounded. Urosomite 1 with anterodorsal notch and slightly rounded boss. Uropod 1 rami subequal. Uropod 2 rami subequal, inner ramus with slight marginal constriction. Uropod 3 without plumose setae on rami; outer ramus 2-articulate, article 2 long, inner ramus extending beyond article 1 of outer ramus. Telson subequal in length and breadth, entire, without dorsal robust setae, with 2 apical robust setae.

Male (sexually dimorphic characters). Based on paratype male, 2.1 mm, AM P41607. Antennae 1–2 with calceoli. Antenna 1 flagellum with strong 2-field callynophore .

Habitat. Scavenger living on muddy bottoms from the littoral to the continental slope, in 15 to 500 m depth.

Remarks. The illustrated specimen has the uropod 3 inner ramus slightly shorter than the outer ramus; in the holotype the rami are subequal. We have seen some variation in the relative lengths of these rami but the inner ramus is always longer than article 1 of the outer ramus and always shorter than the entire outer ramus. The presence of 12 setal-teeth on the maxilla 1 outer plate of the illustrated specimen seems to be an individual aberration. Other Australian specimens have the normal 11 setal-teeth in a 7/4 crown arrangement. Nagada uwedoae occurs from northern Papua New Guinea along the east coast of Australia from the northern Great Barrier Reef to Tasmania ( Lowry & Stoddart 1995, 2003). It can be separated from other lysianassoid species on the GBR by the combination of head and body without scattered setae, gnathopod 1 simple and the posteroventral corner of the third epimeron broadly rounded.

Distribution. Australia. Queensland: Ashmore Reef, Boot Reef, Great Detached Reef, Portlock Reef (current study); Lizard Island (current study). New South Wales ( Lowry & Stoddart 2003). Tasmania ( Lowry & Stoddart 2003). Papua New Guinea. Astrolabe Bay ( Lowry & Stoddart 1995).

Figures

FIGURE 5. Nagada uwedoae Lowry & Stoddart, 1995, whole animal, female, 3.2 mm, AM P78943, Boot Reef, Queensland; remainder, female, 2.5 mm, AM P69472, Lizard Island, Great Barrier Reef.

FIGURE 6. Nagada uwedoae Lowry & Stoddart, 1995, female, 2.5 mm, AM P69472, Lizard Island, Great Barrier Reef.