Paralysianopsis padoz Lowry & Stoddart, 1995

Lowry, J. K. & Stoddart, H. E., 2009, Lysianassidae *, Zootaxa 2260 (1), pp. 561-597 : 578

Paralysianopsis padoz Lowry & Stoddart, 1995

( Figs 11 , 12 )

Paralysianopsis padoz Lowry & Stoddart, 1995: 106 , figs 3, 4.

Material examined. 1 male, 2.0 mm, AM P69600 ( QLD 687 ) ; 2 unsexed, AM P69601 ( QLD 690 ) ; 1 unsexed, AM P69602 ( QLD 698 ) ; 1 female, 3.8 mm, AM P69603 and 14 unsexed, AM P69604 ( QLD 699 ) ; 3 unsexed, AM P69605 ( QLD 700 ) ; 4 unsexed, AM P69606 ( QLD 747 ) ; 14 unsexed, AM P69607 ( QLD 748 ) .

Type locality. Padoz Tinan Reef , Madang Lagoon , Papua New Guinea (5º09.53'S 145º48.88'E), 2 m depth .

Description. Based on female, 3.8 mm, AM P69603.

Head and body. Body without dorsal carina. Head lateral cephalic lobes subtriangular, with apically subacute margins; eyes ovate. Antenna 1 subequal to antenna 2; flagellum with weak 1-field callynophore, robust setae absent from proximal articles; calceoli absent; accessory flagellum with 5 articles, setose medially. Antenna 2 less than 40% of body length; peduncle with strong brush setae; calceoli absent. Mouthparts forming a subquadrate bundle. Epistome / upper lip separate, epistome less produced than upper lip, narrowly rounded; upper lip produced, rounded apically. Mandible molar with reduced column and convex fully triturating surface; palp attached midway, article 3 without A3-setae. Maxilla 1 outer plate with setal-teeth in 6/5 arrangement; setal-tooth 7, left and right symmetrical, cuspidate distally; palp distal margin with apical robust setae. Maxilliped inner plates well developed, greater than half the length of outer plate; outer plates without apical robust setae; palp 4–articulate, article 4 well developed.

Pereon. Gnathopod 1 weakly subchelate; coxa large, about as long as coxa 2, subrectangular with straight anterior margin; basis expanded distally, sparsely setose along anterior margin; ischium short; carpus short (length 1.6 x breadth), subequal in length to propodus, without posterior lobe; propodus longer than broad, margins tapering, palm acute, entire, straight; posterodistal corner with robust seta; dactylus inner margin with large subapical spine. Gnathopod 2 chelate; carpus longer than propodus; palm slightly obtuse; dactylus minute. Pereopod 4 coxa with well developed posteroventral lobe. Pereopod 5 coxa anterior lobe slightly deeper than posterior lobe; basis about as long as broad, with well developed, rounded posteroventral lobe.

Pleon. Epimeron 3 posterodistal corner rounded. Urosomite 1 dorsally straight. Uropod 1 rami subequal. Uropod 2 rami subequal, inner ramus without marginal constriction. Uropod 3 rami subequal, without plumose setae; outer ramus 2–articulate, article 2 long (more than half length of article 1), inner ramus extending beyond article 1 of outer ramus. Telson longer than broad, entire, with dorsal robust setae.

Male (sexually dimorphic characters). Based on male, 2.0 mm, AM P69600 (QLD 687). Antenna 1 flagellum with weak 2-field callynophore (stronger than female); accessory flagellum moderately setose medially.

Habitat. Scavenger living in rubble at 2 to 30 m depth.

Remarks. The morphology of the Paralysianopsis padoz population from Ashmore Reef, Queensland is extremely similar to that of the population from Madang Lagoon, Papua New Guinea. The only discernible differences are the lateral cephalic lobes which are subtriangular in shape in the Ashmore Reef population (a semidome in the Madang population) and the accessory flagellum which is much more setose in the Ashmore Reef population.

Paralysianopsis padoz can be distinguished from other lysianassids on the Great Barrier Reef by the weakly subchelate gnathopod 1 and broadly rounded posteroventral corner on epimeron 3.

Distribution. Australia. Queensland: Ashmore Reef (current study). Papua New Guinea. Madang Lagoon ( Lowry & Stoddart 1995).

Figures

FIGURE 11. Paralysianopsis padoz Lowry & Stoddart, 1995, female, 3.8 mm, AM P69603; male, 2.0 mm, AM P69600; Ashmore Reef, Great Barrier Reef.

FIGURE 12. Paralysianopsis padoz Lowry & Stoddart, 1995, female, 3.8 mm, AM P69603, Ashmore Reef, Great Barrier Reef.