Tryphosites colmani Lowry & Kilgallen, 2014, sp. nov.

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.