Tryphosella flynnana, Lowry & Stoddart, 2009

Lowry, J. K. & Stoddart, H. E., 2009, Lysianassidae *, Zootaxa 2260 (1), pp. 561-597 : 590-593

Tryphosella flynnana sp. nov.

( Figs 19 , 20 )

Type material. Holotype, female, ovigerous (2 eggs), 5.0 mm, AM P69587, east of Flynn Reef , Queensland, Australia (16°41.61'S 146°17.94'E), baited trap, 50 m, 25.9 ° C, J.K. Lowry & K. Dempsey on RV Sunbird, 18–19 May 1994 ( QLD 1032 ) . Paratypes: ovigerous female, 4.5 mm, AM P69588 ; male, 4.2 mm, AM P69589 ; 903 unsexed, AM P52150 ; same station data as holotype .

Additional material examined. 2 unsexed, AM P69590 ( PNG 51); 47 unsexed, AM P49506 ( QLD 916); 16 unsexed, AM P50366 ( QLD 918); 93 unsexed, AM P50198 ( QLD 919); 382 unsexed, AM P50249 ( QLD 933); 105 unsexed, AM P50208 ( QLD 935); 38 unsexed, AM P50374 ( QLD 937); 22 unsexed, AM P50375 ( QLD 938); 78 unsexed, AM P57615 ( QLD 1034); 312 unsexed, AM P50341 ( QLD 1052); 377 unsexed, AM P52250 ( QLD 1054); 129 unsexed, AM P50346 ( QLD 1055); 53 unsexed, AM P50350 ( QLD 1057).

Type locality. East of Flynn Reef , Great Barrier Reef, Queensland, Australia (16°41.61'S 146°17.94'E), 50 m depth .

Etymology. Named for Flynn Reef, near the type locality.

Description. Based on holotype female, 5.0 mm, AM P69587 and paratype female, 4.5 mm, AM P69588.

Head and body. Body without dorsal carina. Head lateral cephalic lobes semidome, with apically rounded margins. Antenna 1 subequal in length to antenna 2; flagellum with strong 2-field callynophore, robust setae absent from proximal articles; calceoli absent; accessory flagellum with 4 articles. Antenna 2 less than 40% of body length; peduncular articles 3 to 5 not enlarged, without brush setae; calceoli present. Mouthparts forming a subquadrate bundle. Epistome produced beyond upper lip, broadly rounded. Mandible molar with asymmetrically reduced column, proximally setose, distally triturating; palp attached midway, article 3 with proximal A3-seta. Maxilla 1 outer plate with setal-teeth in 6/5 arrangement; setal-tooth 7, left and right symmetrical, cuspidate along all of sinsusoidal inner margin; palp distal margin with apical robust setae. Maxilliped inner plates well developed, about half the length of outer plate; outer plate with 2 long, slender apical robust setae; palp 4–articulate, article 4 well developed.

Pereon. Gnathopod 1 subchelate; coxa reduced, significantly shorter than coxa 2, tapering distally; basis sparsely setose along anterior margin; ischium long length (2.3 x breadth); carpus long (length 2.5 x breadth), longer than (1.2 x) propodus, without posterior lobe; propodus longer than broad, margins subparallel, palm acute; dactylus inner face serrated. Gnathopod 2 chelate; carpus much longer than (2.3 x) propodus; palm slightly obtuse; dactylus minute. Pereopod 4 coxa with well developed posteroventral lobe. Pereopod 5 coxa equilobate; basis about as long as broad, posterior margin not strongly serrated, with well developed rounded posteroventral lobe. Pereopod 7 basis posterodistally produced less than halfway along merus, posterior margin slightly serrated.

Pleon. Epimeron 3 posterior margin smooth, posterodistal corner acute. Urosomite 1 with anterodorsal notch and slightly rounded boss. Uropod 1 rami subequal. Uropod 2 rami subequal, inner ramus without marginal constriction. Uropod 3 without plumose setae on rami; outer ramus 2-articulate, article 2 long (about 0.5 x article 1); inner ramus extending beyond article 1 of outer ramus. Telson longer than broad, deeply cleft, with dorsal robust setae, with 1 apical robust seta on each lobe.

Male (sexually dimorphic characters). Based on paratype male AM P69589. Antenna 1 flagellum with stronger 2-field callynophore; calceoli present. Antenna 2 about half length of body; peduncular articles 4 and 5 with brush setae; calceoli present. Epistome more produced and broadly rounded. Uropod 3 with plumose setae on both rami .

Habitat. Soft bottoms in 10 to 100 m depth.

Remarks. Tryphosella flynnana is very similar to T. wongada Lowry & Stoddart, 1995 , from Madang Lagoon in northern Papua New Guinea. However in T. flynnana antenna 1 is shorter than antenna 2 (subequal in T. wongada ); T. flynnana has no robust setae on the proximal articles of antenna 1 (present in T. wongada ); T. flynnana has 2 apical robust setae on the outer plate of the maxilliped (1 robust seta in T. wongada ). The two species appear to live in different habitats: T. flynnana on the continental shelf down to about 100 m and T. wongada in a lagoon system in less than 20 m depth.

Tryphosella flynnana is also similar to T. astrolabensis Lowry & Stoddart, 1995 from Astrolabe Bay in northern Papua New Guinea. However T. astrolabensis has more rounded lateral cephalic lobes than does T. flynnana , antenna 1 is subequal to antenna 2 in males and the posterodistal corner of epimeron 3 is produced into a small spine. Tryphosella flynnana lives on the inner continental shelf between 50 and 100 m depth, but T. astrolabensis has a wider depth range living on the continental shelf and slope from 90 to at least 500 m depth.

Distribution. Australia. Queensland: east of Flynn Reef (current study). Papua New Guinea. Bootless Bay (current study).

Figures

FIGURE 19. Tryphosella flynnana sp. nov., holotype female, 5.0 mm, AM P69587; habitus: paratype female, 4.5 mm, AM P69588; paratype male, 4.2 mm, AM P69589; east of Flynn Reef, Great Barrier Reef.

FIGURE 20. Tryphosella flynnana sp. nov., holotype, female, 5.0 mm, AM P69587; paratype male, 4.2 mm, AM P69589; east of Flynn Reef, Great Barrier Reef.