Tryphosella cameloides, Lowry & Stoddart, 2009

Lowry, J. K. & Stoddart, H. E., 2009, Lysianassidae *, Zootaxa 2260 (1), pp. 561-597 : 584-586

Tryphosella cameloides sp. nov.

( Figs 15 , 16 )

Tryphosella sp. 1 . — Keable, 1995: 42.

Type material. Holotype, female, ovigerous (3 eggs), 3.5 mm, AM P69362, Blue Lagoon between South and Palfrey Islands, Lizard Island, Queensland, Australia (14°40'S 145°28'E), very exposed, bare consolidated reef flat with boulders 30–40 cm in diameter, very few branching hard corals, occasional patch of soft corals, mainly Sarcophyton , baited trap, 0.5 m, S.J. Keable & D.J. Townsend, 25-26 June 1989 ( QLD 429 ) . Paratypes: 1 male, 3.0 mm, AM P69363 ; 1 male, 2.8 mm, AM P69364; 35 unsexed, AM P69365, same station data as holotype .

Additional material examined. 1 unsexed, AM P69371 ( BK 126); 1 unsexed, AM P69372 ( BK 131); 1 unsexed, AM P69368 ( JDT / LIZ 15); 1 unsexed, AM P69370 ( JDT / LIZ 17); 1 unsexed, AM P69369 ( JDT / LIZ 19); 1 unsexed, AM P69373 ( JDT / OPH 1); 1 unsexed, AM P69352 ( QLD 291); 1 unsexed, AM P69353 ( QLD 311); 1 unsexed, AM P69354 ( QLD 323); 1 unsexed, AM P69355 ( QLD 325); 2 unsexed, AM P69356 ( QLD 372); 8 unsexed, AM P69357 ( QLD 374); 1 unsexed, AM P69358 ( QLD 379); 1 unsexed, AM P69359 ( QLD 396); 7 unsexed, AM P69360 ( QLD 401); 1 unsexed, AM P69361 ( QLD 427); 3 unsexed, AM P69366 ( QLD 481); 1 unsexed, AM P69367 ( QLD 575); 5 unsexed, P69351 ( QLD 631); 3 unsexed, AM P69350 ( QLD 673); 1 unsexed, AM P69349 ( QLD 746); 4 unsexed, AM P69346 ( QLD 763); 1 unsexed, AM P69347 ( QLD 764); 1 unsexed, AM P69348 ( QLD 767); 1 unsexed, P71934 ( QLD 1364); 1 unsexed, P70775 ( QLD 1653); 2 unsexed, ( SEL /LZI-1-2); 3 unsexed ( SEL /LZI-2-1); 1 unsexed ( SEL /LZI-2-7).

Type locality. Blue Lagoon between South and Palfrey Islands, Lizard Island, Queensland, Australia (14°40'S 145°28'E), 0.5 m depth .

Etymology. The name cameloides indicates the close similarity to Tryphosella camela ( Stebbing, 1910) .

Description. Based on holotype female, 3.5 mm, AM P69362.

Head and body. Body without dorsal carina. Head lateral cephalic lobes rounded, with apically rounded margins. Antenna 1 subequal to antenna 2; with weak 2-field callynophore, robust setae absent from proximal articles; calceoli absent; accessory flagellum with 3 articles. Antenna 2 less than 40% of body length; peduncular articles 3 to 5 not enlarged, without brush setae; calceoli absent. Mouthparts forming a subquadrate bundle. Epistome produced beyond upper lip, narrowly 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 most 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 3 short, slender apical robust setae; palp 4–articulate, article 4 well developed.

Pereon. Gnathopod 1 subchelate; coxa slightly reduced, slightly shorter than coxa 2, tapering distally; basis sparsely setose along anterior margin; ischium short (length 1.7 x breadth); carpus long (length 2.3 x breadth), subequal in length to propodus, without posterior lobe; propodus longer than broad, margins subparallel, palm slightly acute; dactylus inner face serrated. Gnathopod 2 chelate; carpus 1.5 x length of 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. Pereopod 7 basis posterior margin slightly serrated.

Pleon. Epimeron 3 posterior margin smooth, posterodistal corner subquadrate. Urosomite 1 with deep notch and subtriangular, subacute boss. Uropod 1 rami subequal. Uropod 2 rami subequal, inner ramus without marginal constriction. Uropod 3 rami distinctly unequal, without plumose setae; outer ramus 2- articulate, article 2 long (about 0.5 x article 1); inner ramus not extending beyond article 1 of outer ramus. Telson distinctly 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, 3 mm, AM P69363. Head lateral cephalic lobes semidome, with apically truncated margins. Antenna 1 flagellum with strong 2-field callynophore; calceoli present. Antenna 2 about half body length; calceoli present. Epistome produced beyond upper lip (more so than in female). Uropod 3 with a few plumose setae on each ramus.

Habitat. Scavenger living on sand patches among corals on reef top and in coral rubble on reef slopes from the intertidal to 30 m depth.

Remarks. Tryphosella cameloides is most similar to T. camela ( Stebbing, 1910) . Tryphosella camela has not been redescribed, but we have examined new material. In T. cameloides the gnathopod 2 palm is slightly obtuse (transverse in T. camela ). Both species have a distinctive subtriangular, subacute boss on urosomite 1. In T. cameloides the boss is laterally very thin whereas in T. camela it is more robust and is preceded by a very deep incision. The two species also differ slightly in the shape of the basis of pereopods 5 to 7.

Distribution. Australia. Queensland: Lizard Island; Eagle Island; Orpheus Island; Boot Reef; Great

Detached Reef; Ashmore Reef (all current study).

Figures

FIGURE 15. Tryphosella cameloides sp. nov., holotype female, 3.5 mm, AM P69362; paratype male, 3.0 mm, AM P69363; Blue Lagoon, Lizard Island, Great Barrier Reef.

FIGURE 16. Tryphosella cameloides sp. nov., holotype female, 3.5 mm, AM P69362; paratype male, 3.0 mm, AM P69363; Blue Lagoon, Lizard Island, Great Barrier Reef.