Tryphosella charlotteae, Lowry & Stoddart, 2009

Lowry, J. K. & Stoddart, H. E., 2009, Lysianassidae *, Zootaxa 2260 (1), pp. 561-597 : 587-590

Tryphosella charlotteae sp. nov.

( Figs 17 , 18 )

Type material. Holotype, female, ovigerous (at least 8 eggs), 12 mm, AM P69114, 100 metres north-east of sand spit, One Tree Island , Queensland, Australia (23°30'S 152°05'E), 1 m, large corer in coarse sand, C. Short & J. Young, 20 October 1979 ( QLD 101 ) . Paratype: male, 10mm, AM P69115, same station data as holotype . Paratypes: 1 ovigerous female, 1 immature specimen, AM P69111 , Reef 'C', One Tree Island lagoon, Queensland, Australia (23°30'S 152°05'E), 5.5 m, light trap over sand, 2005 hours, P.S. McWilliam, 27 November 1977 ( QLD 98 ) . Paratypes: 1 ovigerous female, 1 adult male, 2 immature specimens, AM P69112 , One Tree Island lagoon, Queensland, Australia (23°30'S 152°05'E), light trap 2 metres away from reef, 2207 hours, P.S. McWilliam, 14 November 1976, OT 208 ( QLD 99 ) . Paratypes: 1 male, 3 immature specimens, AM P69113 , One Tree Island lagoon, Queensland, Australia (23°30'S 152°05'E), light trap, P.S. McWilliam, November 1975 or 1977 ( QLD 100 ) .

Additional material examined. 1 male, AM P69116 ( QLD 102 ); 1 unsexed, AM P71853 (Kimbla 2) ; 1 male, AM P69117 (Kimbla Q 11) .

Type locality. 100 metres north-east of sand spit, One Tree Island , Queensland, Australia (23°30'S 152°05'E) .

Etymology. Named for Charlotte Watson, one of the collectors of the type material.

Description. Based on holotype, female, 12 mm, AM P69114 and paratype male, 10 mm, AM P69115.

Head and body. Body without dorsal carina. Head lateral cephalic lobes subtriangular, with apically rounded margins; eyes large, reniform, with ventral concave lens. Antenna 1 shorter than antenna 2; flagellum with strong 2-field callynophore, robust setae absent from proximal articles; calceoli present; accessory flagellum with 4 articles. Antenna 2 approximately half body length; peduncular articles 4 and 5 not enlarged, brush setae present; calceoli present. Mouthparts forming a subquadrate bundle. Epistome less produced than upper lip, straight. 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 straight inner margin; palp distal margin with apical robust setae. Maxilliped outer plate with 2 short apical robust setae; palp 4– articulate, article 4 well developed.

Pereon. Gnathopod 1 subchelate; coxa slightly reduced, slightly shorter than coxa 2, slightly tapering and broadly rounded distally; basis moderately setose along anterior margin; ischium long (length 2.2 x breadth); carpus long (length 2.1 x breadth), subequal in length to propodus, without posterior lobe; propodus longer than broad, margins subparallel, palm acute. Gnathopod 2 chelate; carpus longer than propodus; palm obtuse; dactylus minute. Pereopod 4 coxa with distinct lateral ridge, with well developed posteroventral lobe. Pereopod 5 coxa with distinct lateral ridge, equilobate; basis about as long as broad, with “photophore”. Pereopod 7 basis posterior margin slightly serrated.

Pleon. Epimeron 3 posterior margin smooth, posterodistal corner rounded. Urosomite 1 with anterodorsal notch and slightly rounded boss. Uropod 1 rami subequal. Uropod 2 rami subequal, inner ramus without marginal constriction. Uropod 3 with plumose setae on each ramus; outer ramus 2-articulate, article 2 short (about 0.1 x article 1); inner ramus not extending beyond article 1 of outer ramus. Telson longer than broad, deeply cleft, with dorsal robust setae, with 1or 2 apical robust setae on each lobe.

Habitat. Sandy bottoms from 1 to 82 m depth.

Remarks. Tryphosella charlotteae is very similar to T. mucronata ( Pirlot, 1936) from Waigeo Island in West New Guinea. Both species have a well developed “photophore” on the basis of pereopod 5. The strongest differences between these species are the shape of the posteroventral lobe of pereopod 4 coxa which is more rounded in P. mucronata and has a strong lateral ridge in T. charlotteae ; and the pereopod 7 basis which tapers less and is almost straight posteroventrally in T. mucronata . Stebbing (1888) described T. miersi (as Hippomedon miersi ) from east of Moncoeur Island in Bass Strait. He did not illustrate a “photophore” on the basis of pereopod 5, but it may have been missed in his single preserved specimen. Tryphosella miersi differs from T. charlotteae in not having any ridging on the coxae of pereopods 4 or 5.

Distribution. Australia. Queensland: Lizard Island; One Tree Island; Fraser Island; Moreton Bay (all current study).

Figures

FIGURE 17. Tryphosella charlotteae sp. nov., holotype female, 12 mm, AM P69114; habitus and male parts, paratype male, 10 mm, AM P69115; One Tree Island, Great Barrier Reef.

FIGURE 18. Tryphosella charlotteae sp. nov., holotype, female, 12 mm, AM P69114, One Tree Island, Great Barrier Reef.