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.

Tryphosella bet 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 View Materials , 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 View Materials ; 1 ovigerous female, 4.0 mm, AM P69570 View Materials ; 38 unsexed, AM P69571 View Materials , same station data as holotype GoogleMaps .

Additional material examined. 1 female, AM P69576 View Materials , 1 male, AM P69577 View Materials , 30 unsexed, AM P69578 View Materials (NT 169) ; 2 unsexed, AM P69579 View Materials ( QLD 116 ) ; 1 ovigerous female, AM P69580 View Materials ( QLD 303 ) ; 1 immature specimen, AM P69581 View Materials ( QLD 304 ) ; 1 female, 1 immature specimen, AM P69582 View Materials ( QLD 331 ) ; 1 ovigerous female, AM P69583 View Materials ( QLD 459 ) ; 1 female, AM P69584 View Materials and 1 ovigerous female, 2 juveniles, AM P69585 View Materials ( QLD 547 ) ; 2 ovigerous females, 2 juveniles, AM P69586 View Materials ( QLD 548 ) ; 6 unsexed, AM P69593 View Materials ( QLD 631 ) ; 1 unsexed, AM P69592 View Materials ( QLD 670 ) ; 18 unsexed, AM P69591 View Materials ( QLD 673 ) ; 96 unsexed, AM P52081 View Materials ( QLD 915 ) ; 16 unsexed, AM P52077 View Materials ( QLD 1073 ) ; 17 unsexed, AM P52078 View Materials ( QLD 1075 ) ; 36 unsexed, AM P52079 View Materials ( QLD 1091 ) ; 60 unsexed, AM P52080 View Materials ( 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 View Materials and ovigerous female, 4.0 mm, AM P69570 View Materials .

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 View Materials . 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).

AM

Australian Museum

Kingdom

Animalia

Phylum

Arthropoda

Class

Malacostraca

Order

Amphipoda

Family

Tryphosidae

Genus

Tryphosella

Loc

Tryphosella bet

Lowry, J. K. & Stoddart, H. E. 2009
2009
Loc

Tryphosella sp. 2

Keable, S. J. 1995: 42
1995