Tryphosella bet, Lowry & Stoddart, 2009

Lowry, J. K. & Stoddart, H. E., 2009, Lysianassidae *, Zootaxa 2260 (1), pp. 561-597 : 581-583

publication ID	https://doi.org/ 10.11646/zootaxa.2260.1.31
persistent identifier	https://treatment.plazi.org/id/03FCB50C-B90A-970C-FF17-81649E72FD41
treatment provided by	Felipe
scientific name	Tryphosella bet
status	sp. nov.

Treatment

Tryphosella bet View in CoL sp. nov.

( Figs 13 View FIGURE 13 , 14 View FIGURE 14 )

Tryphosella sp. 2 . — Keable, 1995: 42.

Type material. Holotype, female, ovigerous (6 eggs), 4.5 mm, AM P69568, Bet Reef, Torres Strait , Queensland, Australia (10°10.54'S 142°56.01'E), grey clay mud with shell grit, two baited traps set overnight, 20 m, S. Keable, 30 January 1993 ( QLD 784 ) GoogleMaps . Paratypes: 1 male, 3.8 mm, AM P69569; 1 ovigerous female, 4.0 mm, AM P69570; 38 unsexed, AM P69571, same station data as holotype GoogleMaps .

Additional material examined. 1 female, AM P69576 , 1 male, AM P69577, 30 unsexed, AM P69578 (NT 169) ; 2 unsexed, AM P69579 ( QLD 116 ) ; 1 ovigerous female, AM P69580 ( QLD 303 ) ; 1 immature specimen, AM P69581 ( QLD 304 ) ; 1 female, 1 immature specimen, AM P69582 ( QLD 331 ) ; 1 ovigerous female, AM P69583 ( QLD 459 ) ; 1 female, AM P69584 and 1 ovigerous female, 2 juveniles, AM P69585 ( QLD 547 ) ; 2 ovigerous females, 2 juveniles, AM P69586 ( QLD 548 ) ; 6 unsexed, AM P69593 ( QLD 631 ) ; 1 unsexed, AM P69592 ( QLD 670 ) ; 18 unsexed, AM P69591 ( QLD 673 ) ; 96 unsexed, AM P52081 ( QLD 915 ) ; 16 unsexed, AM P52077 ( QLD 1073 ) ; 17 unsexed, AM P52078 ( QLD 1075 ) ; 36 unsexed, AM P52079 ( QLD 1091 ) ; 60 unsexed, AM P52080 ( QLD 1093 ) .

Type locality. Bet Reef, Torres Strait , Queensland, Australia (10°10.54'S 142°56.01'E), 20 m depth GoogleMaps .

Etymology. Named for Bet Reef , the type locality.

Description. Based on holotype female, 4.5 mm, AM P69568 and ovigerous female, 4.0 mm, AM P69570.

Head and body. Body without dorsal carina. Head lateral cephalic lobes rounded, with apically rounded margins. Antenna 1 shorter than antenna 2; flagellum with strong 2-field callynophore, robust setae present on 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 absent. Mouthparts forming a subquadrate bundle. Epistome produced slightly 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 most of sinsusoidal inner margin; palp distal margin with apical robust setae. Maxilliped inner plates well developed, greater than 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 slightly reduced, slightly shorter than coxa 2, tapering distally; basis sparsely setose along anterior margin; ischium long (length 2.2 x breadth); carpus long (length 2.5 x breadth), subequal in length to propodus, without posterior lobe; propodus longer than broad, margins subparallel, palm acute; dactylus inner face serrated. Gnathopod 2 subchelate; carpus 2.2 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, with well developed wedge-shaped posteroventral lobe. Pereopod 7 basis 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 rami subequal, with sparse plumose setae; outer ramus 2-articulate, article 2 long (about 0.5 x article 1); inner ramus 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, 3.8 mm, AM P69569. Antenna 1 flagellum with stronger 2-field callynophore; calceoli present. Antenna 2 peduncular articles 4 and 5 with brush setae; calceoli present. Uropod 3 with more plumose setae and dense fine setae on each ramus .

Habitat. Scavenger living on mud and shell grit or sand and rubble bottoms from 19 to 25 m depth.

Remarks. Tryphosella bet differs from T. cameloides , T. charlotteae , T. flynnana and T. seasana in having robust setae present on the proximal articles of antenna 1 flagellum. Tryphosella bet is very similar to T. wongada Lowry & Stoddart, 1995 but differs from that species in having 2 (rather than 1) long apical robust setae on the outer plate of the maxilliped.

Distribution. Australia. Queensland: Bet Reef, Torres Strait (current study); Lizard Island (current study). Northern Territory: West Point, Darwin (current study).