Tryphosites colmani, Lowry & Kilgallen, 2014

Lowry, J. K. & Kilgallen, N. M., 2014, New tryphosine amphipods from Australian waters (Crustacea, Amphipoda, Lysianassoidea, Lysianassidae, Tryphosinae), Zootaxa 3844 (1), pp. 1-64 : 52-57

Tryphosites colmani sp. nov.

( Figs 39–41 )

Types. Holotype, ovigerous female, 7.1 mm, AM P.68955, east of Long Reef Point , New South Wales, Australia (33°43'S 151°46'E to 33°44'S 151°46'E), 174 m, 20 December 1985, J.K. Lowry & R.T. Springthorpe, FRV Kapala stn K85-21-08 . Paratypes: 1 male, AM P.68956, 7.4 mm, same collection details as holotype; 2 males, AM P.68957, 6.4–7.1 mm, east of Long Reef Point, New South Wales, Australia (33°46’S 151°43’E), 176 m, 5 December 1977, FRV Kapala, FRV Kapala stn K77-23-01.

Additional material examined. 1 male, AM P.68948; 2 males, AM P.68949, both from north-east of Lady Elliott Island , Queensland, Australia (24°03.7’S 152°49.4'E), 150 m, 4 July 1984, P.H. Colman & G. Hangay & S.J. Keable, HMAS Kimbla stn K84-3 ; 1 specimen, NMV J67534 , Bass Strait , Australia (39º48.6’S 146º18.8’E), 82 m, shell-bryozoans-mud, epibenthic sled, 13 November 1981, G.C.B. Poore et al., RV Tangaroa stn BSS-158S (= NZOI stn Q616); 1 specimen, NMV J67535 , off Eden , New South Wales, Australia (37º00.60'S 50º20.70'E), 363 m, coarse shell, WHOI epibenthic sled, 21 July 1986, G.C.B. Poore et al., RV Franklin , SLOPE stn 22.

Type Locality. East of Long Reef Point , New South Wales, Australia (33°43'S 151°46'E to 33°44'S 151°46'E), 174 m depth.

Etymology. Named after Phil Colman, a naturalist who has made a life-long study of Long Reef, the type locality.

Description. Holotype, female, 7.1 mm, AM P.68955. Head lateral cephalic lobe subtriangular, apically acute. Antenna 1 accessory flagellum not forming operculum, 5-articulate; primary flagellum with strong 2-field callynophore, robust setae absent from proximal articles; calceoli absent. Antenna 2 peduncular article 3 short; articles 3 to 5 not enlarged; flagellum long, calceoli absent. Labrum, epistome and upper lip separate; epistome produced beyond upper lip, concave, apically acute; upper lip not produced. Mandible molar columnar, with oval fully triturating surface; palp attached about midway or very slightly proximally. Maxilla 1 outer plate setal-tooth 7 present, left and right asymmetrical, cuspidate distally; palp distal margin with apical robust setae. Maxilliped outer plate with 2, short apical robust setae.

Pereonites 1–7 dorsally smooth. Gnathopod 1 subchelate; coxa medium to long, about as long as coxa 2, subrectangular with slightly concave anterior margin; basis moderately setose along anterior margin; ischium short; carpus long, longer than propodus, without posterior lobe; propodus small, margins subparallel, sparsely setose along posterior margin, palm slightly acute, entire, straight. Gnathopod 2 minutely subchelate; propodus palm moderately obtuse. Pereopod 4 coxa with a well-developed posteroventral lobe. Pereopod 5 basis longer than broad, not posteroproximally excavate, posterior margin not serrate. Pereopod 7 basis posterodistally produced, not reaching merus.

Pleonite 3 without mid-dorsal carina, not produced dorsodistally, posterodorsal margin not produced. Epimeron 3 posterior margin smooth, posteroventral corner broadly rounded. Urosomite 1 with anterodorsal notch and slightly rounded boss. Uropod 3 inner and outer rami well developed, outer ramus article 2 short, without plumose setae on rami. Telson moderately clef t, longer than wide, with 4 dorsal robust setae per lobe and 1–2 apical robust setae on each lobe.

Sexually dimorphic characters. Based on paratype, male, 7.4 mm, AM P.68956. Antenna 1 with calceoli. Antenna 2 peduncular article 3 short; articles 4 and 5 enlarged; flagellum long, calceoli present.

Remarks. Tryphosites colmani sp. nov. is most similar to the type of the genus, T. longipes ( Bate, 1862) . However, it lacks the broad, upturned spine on the posterodistal corner of the epimeron 3 which distinguishes it from T. longipes .

Depth range. 82–363 m.

Distribution. Australia. Bass Strait, Victoria to north-east of Lady Elliott Island, Queensland.

Figures

FIGURE 39. Tryphosites colmani sp. nov., habitus and male U3 from AM P.68948, from northeast of Lady Elliott Island, Queensland; uropods, telson from holotype, female, AM P.68955, from east of Long Reef Point, New South Wales. Scale: 0.2 mm.

FIGURE 40. Tryphosites colmani sp. nov., holotype, female, 7.1 mm, AM P.68955 from east of Long Reef Point, New South Wales; male, AM P.68948, from north-east of Lady Elliott Island, Queensland. Scale: 0.2 mm.

FIGURE 41. Tryphosites colmani sp. nov., holotype, female, 7.1 mm, AM P.68955, from east of Long Reef Point, New South Wales. Scale: 0.2 mm.