Glandulotiron spinipes, 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 : 39-42

Glandulotiron spinipes sp. nov.

( Figs 21–22 )

Type fixation. Holotype, ♀.—Here designated.

Etymology. The species is named for the long row of robust setae along the anterior margin of the basis of gnathopod 2.

Material examined. Holotype, ♀, 9.0 mm. Australia, Victoria, Bass Strait , 30 km SSW of Warrnambool, 38˚38.12’S, 142˚35.00’E, 59 m, epibenthic sled, R. S. Wilson, 20 November 1981, RV Tangaroa , stn BSS 188 , NMV J73751 .

Paratypes. Same data as holotype, NMV J75152 (2 specimens) . Australia, Tasmania, Central Bass Strait, 35 km N of Cape Wickham, King Island , 39˚13.36’S, 143˚55.36’E, 85 m, fine sand, S-M grab, R. Wilson, 23 November 1981, RV Tangaroa , stn BSS205 , NMV J73726 (1 ♀, 2 ♂) . Australia Victoria, Western Bass Strait , 15 km S of Cape Otway, 39˚00’S, 143˚32’E, 81 m, coarse shell, G.C.B. Poore, 8 October 1980, HMAS Kimbla , stn BSS50 , NMV J73735 (1 ♀) . Australia, Tasmania, Eastern Bass Strait, Flinders Island , 70 km N of North Point, 39˚05.12’S, 147˚56.36’E, 62 m, shelly sand, WHOI epibenthic sled, R. Wilson, 17 November 1981, RV Tangaroa , stn BSS172 , NMV J73745 (1 ♀) . Australia, Victoria, Central Bass Strait , 65 km S of Cape Schanck, 39˚08.18’S, 144˚43.54’E, 66 m, coarse sand, R. Wilson, 23 November 1981, RV Tangaroa , stn BSS201 , NMV J73746 (1 ♀) . Australia, Tasmania, Central Bass Strait, King Island , 35 km N of Cape Wickham, 39˚13.36’S, 143˚55.36’E, 85 m, fine sand, R. Wilson, 23 November 1981, RV Tangaroa , stn BSS205 , NMV J73747 (3 ♀) . Australia, Tasmania, Western Bass Strait, King Island , 59 km WNW of Cape Farewell, 39˚28’S, 143˚17’E, 103 m. coarse sand, G.C.B. Poore, 10 October 1980, HMAS Kimbla , stn BSS81 , NMV J73748 (1 ovig. ♀) . Australia, Tasmania, Eastern Bass Strait, Flinders Island , 70 km N of North Point, 39˚05.12’S, 147˚56.36’E, 62 m, shelly sand, R. Wilson, 17 November 1981, RV Tangaroa , stn BSS172 , NMV J73749 (1 ♀) . Australia, Victoria, Western Bass Strait , 31 km SSW of Cape Otway, 39˚08’S, 143˚24’E, 77 m, medium sand, G.C.B. Poore, 8 October 1980, HMAS Kimbla , stn BSS56 , NMV J73750 (2 ♀) . Australia, Tasmania, Eastern Bass Strait, Flinders Island , 94 km NE of North Point, 38˚53.42’S, 147˚55.06’E, 71 m, medium sand, R. Wilson, 17 November 1981, RV Tangaroa , stn BSS171 , NMV J73752 (2 ♂, 10 ♀) . Australia, Central Bass Strait , 35 km WNW of West Point, Tasmania, 40˚47.4’S 144˚17.7’E, 99 m, coarse sand, M. Gomon et al., 2 February 1981, FRV Hai Kung, stn BSS125 , NMV J75153 (1 ♀) . Australia, Tasman Sea , 34°17’05”S, 168°21’30”E, 780–800 m, beam trawl, P.B. Berents, 02 Jun 2003, RV Tangaroa , stn TAN0308/141, AM P72854 (11 specimens) . Australia, Tasmania, Eastern Bass Strait, Flinders Island , 94 km NE of North Point, 38˚53.42’S, 147˚55.06’E, 71 m, medium sand, R. Wilson, 17 November 1981, RV Tangaroa , stn BSS171 , NHMD 916112 (5 specimens) .

Description (female). Rostrum with rounded apex. Interantennal lobes broad, truncate, lower corner more angular than upper corner. Accessory eye composed of 6 ommatidia in crescent.

Mouthparts. Maxilla 1 with 5 short, blunt, bi- to 3-cusped apical setal spines and a single more slender serrate one in lateral corner; outer plate with row of 9 denticulate setal spines. Mouthparts otherwise normal.

Antennae 1 as long as pereonite 1 to half of 5 combined along dorsum, peduncle article 2 about half as long as 1, article 3 2/3 length of 2, article 1 with single penicillate seta dorsodistally and 2 medioventrally; flagellum as long as peduncle, of 8 articles, assessory flagellum of 4 articles, both sparsely setulose. Antenna 2 as long as pereonites 1–6 combined along dorsum, peduncular article 4 the longest, flagellum of 6+ articles, articles 1–6 with single slender robust seta distally, antenna otherwise sparsely setulose.

Coxal plates 1–3 distally fringed with setae of varying length, without brim of fine setules, plate 4 without setae.

Gnathopods 1 and 2 propodus slightly less than half as long as carpus; carpus with scattered setae on anterior margin, 10–12 groups of unequally long setae along posterior margin; dactylus with unguis 0.4 length of propodus, nearly straight. Gnathopod 1 basis with long and short anterior and posterior setae; propodus with row of 4–5, pectinate setae on posterior margin. Gnathopod 2 basis less setose, with row of 12 robust setae on anterodistal margin.

Pereopods 3–4 basis with a few long anterior and posterior setae.

Pereopods 5–7 basis with posterodistal rounded projection, pereopod 5 broadest distally, pereopod 6 broadest in middle, pereopod 7 broadest proximally with large rounded posterior projection; posterior margin crenulate in 7; propodus of pereopod 5 as long as carpus, of pereopod 6 3/4 length of carpus, of pereopod 7 half-length of carpus. Pereopod 6 with single and pereopod 7 with row of long setae submarginally on medial surface of basis.

Uropod 1 peduncle reaching about 2/3 along peduncle of uropod 2 peduncle, rami of equal length, about 2/3 length of peduncle, reaching to end of rami of uropod 2; both uropods reaching barely halfway along outer ramus of uropod 3. Uropod 2 rami of equal length. Uropod 3 peduncle about 3/4 length of outer ramus, outer ramus basal article with row of 7 robust setae dorsolaterally, and 6 very small robust setae ventrolaterally, small second article with 3 dorsal robust setae; inner ramus reaching to 9/10 of basal article of outer ramus, dorsal margin with row of long setae and 2 robust setae, apex with 3 robust setae.

Telson. Reaching 2/3 along outer ramus of uropod 3, length/width 2.0, with row of 4 robust setae, small simple setae and 1 plumose seta dorsally on each lobe, apices with 1 long and 1 short robust seta.

Male. Similar to female but antenna 1 flagellum article 1 very long and slender, with medioventral single-field callynophore.

Size. Largest ♀, 9.0 mm. Largest ♂, 8.5 mm.

Distribution. Australia, Bass Strait; 59– 103 m.

Figures

FIGURE 21. Glandulotiron spinipes gen. et sp. nov. Holotype, ♀, except M, ♂ paratype. clv, head lateral view; mx1, axilla 1; tel, telson; us, urosome.

FIGURE 22. Glandulotiron spinipes gen. et sp. nov. Holotype, ♀. cox3, coxal plate 3; gp1, gnathopod 1; gp2, gnathopod 2; p4–7, pereopods 4 to 7.