Glandulotiron salsevisio, Just, 2022

Just, Jean, 2022, Tirons of the world: a review of ‘ tironid’ amphipods, description of new genera and species, and establishment of a new subfamily Tironinae Stebbing, 1906 stat. nov. (Crustacea, Synopiidae), Zootaxa 5139 (1), pp. 1-89 : 33

Glandulotiron salsevisio sp. nov.

( Figs 17–18 )

Type fixation. Holotype, ♀.—Here designated.

Etymology. The epithet is a combination of the Latin salse (funny) and visio (face).

Material examined. Holotype, ♀, 6.2 mm. Western Australia, NW shelf, between Port Hedland and Dampier, 19˚03.30’S, 119˚03.30’E, 84 m, S-M grab, RV Soela, CSIRO Div. of Fisheries , stn 01/83/B12, WAM C76567.

Paratypes. Western Australia, Northwest Shelf , between Dampier and Port Hedland, 19˚56.9’S, 117˚53.5’E, 43 m, 18 February 1983, CSIRO stn 01/83/B2/G, NMV J75151 (♂ 1 4.8 mm, illustrated). Australia, Northwest Shelf , between Dampier and Port Hedland, 19˚04.24’S, 118˚47.30’E, 84 m, grab, 29 June 1983, CSIRO stn 03.83.B6.G, NMV J73825 (1 ♂) . Western Australia, NW shelf, between Port Hedland and Dampier, 19˚29.00’S, 118˚55.12’E, 39 m, S-M grab, RV Soela , CSIRO Div. of Fisheries, stn 05/83/B9, NMV J73831 (1 small ♀). Australia , Northern Territory, Arafura Sea , 09°25’05”S, 134°18’37”E, 89 m, a few muddy sand balls from hard grounds with many sessile fauna, Diamantina Dredge, G.D.F. Wilson, RV Southern Surveyor, stn SS05/2005/013, 10 May 2005, AM P78800 (6 specimens). Australia , Northern Territory, Arafura Sea , 09°25’05”S, 134°18’37”E, 89 m, a few muddy sand balls from hard grounds with many sessile fauna, Diamantina Dredge, G.D.F. Wilson, RV Southern Surveyor, stn SS05/2005/013, 10 May 2005, NHMD 916110 (2 specimens) .

Description (female). Rostrum short, blunt. Interantennal lobes nearly obsolete, appear drooping with lower margin rounded to fading away. Accessory eye composed of 3 ommatidia, 2 appressed anteriorly and 1 separate more posteriorly.

Mouthparts. Maxilla 1 palp with 5 short blunt tri-cusped robust setae and single longer lateral, serrate seta; outer plate with row of 9 robust setae, most with small denticles. Mouthparts otherwise normal.

Antenna 1 as long as pereonites 1–6 combined along dorsum, peduncle article 2 about half as long as 1, article 3 about 4/5 length of 2, article 1 with single penicillate seta ventrally in posterior half and 2 mid dorsally; flagellum as long as peduncle, of 8+ articles, assessory flagellum of 3+ articles, both sparsely setose. Antenna 2 as long as pereonites 1–7 combined along dorsum, peduncular article 4 the longest, flagellum of 6+ articles, articles 1–4 with single slender robust seta distally, antenna otherwise sparsely setose.

Coxal plates 1–3 rounded apex, fringed with some simple setae and dense row of fine setules, plate 4 naked.

Gnathopods 1 and 2 basis with anterior and posterior simple setae of varying length, denser on pereopod 2; carpus on both with scattered setae on anterior margin, 8–9 groups of unequally long setae along posterior margin. Gnathopod 1 propodus with 5–6 slender pectinate setae on posterior margin.

Pereopods 3–4 normal. Pereopods 5–6 basis pear-shaped, broadest distally, with broadly rounded posterodistal projection, anterior margin with long setae proximally. Pereopod 7 basis ovate, broadest in middle, with row of long setae on medial surface, posterodistal lobe rounded angular.

Uropod 1 and 2 of subequal length, reaching to middle of uropod 3 outer ramus; peduncle of uropod 1 reaching to end of uropod 2 peduncle, rami of equal length, 2/3 length of peduncle, with 1 or 2 robust setae dorsally. Uropod 2 outer ramus about 4/5 length of inner ramus, both rami with 1 or 2 robust setae dorsally. Uropod 3 peduncle about 4/5 length of outer ramus, rami reaching beyond apex of telson with 1/3 telson length, outer ramus main article with 6 dorsal robust setae and row of small robust setae ventrolaterally, small second article with 3 dorsal robust setae; inner ramus reaching to end of basal article of outer ramus, dorsolateral margin with row of long setae and 2 robust setae distally.

Telson. Length/width 1.8; reaching 2/3 along inner ramus of uropod 3, with row of 2–3 robust setae, a few simple setae and doublet of finely plumose setae on each lobe, apices with 1 long and 1 short robust seta.

Male. As female except sexually diverse antennae. Antenna 1 as long as pereonite1–6 and half of 7 combined; assessory flagellum as long as flagellar articles 1 and 2 combined; antenna 2 as long as pereonite 1–pleonite 1 combined, flagellum of 5 articles. Dorsal projection on urosomite 3 longer and sharper than in female.

Size. Largest ♀, 6.2 mm. Largest ♂, 4.8 mm.

Distribution. Western Australia, Northwest Shelf; 39– 84 m. Northern Territory, Arafura Sea, 89 m.

Figures

FIGURE 17. Glandulotiron salsevisio gen. et sp. nov. Holotype, ♀. clv, head and antennae lateral view; ip, inner plate; md, mandible, mx1, maxilla 1; mxp, maxilliped; op, outer plate; tel, telson; us, urosome.

FIGURE 18. Glandulotiron salsevisio gen. et sp. nov. Holotype, ♀. gp1, gnathopod 1; gp2, gnathopod 2; cox4, coxal plate 4; p3, pereopod 3; p5–7, pereopods 5 to 7.