Glandulotiron concavus Just 2022, sp. nov.
Creators: name: Just, Jean
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Amphipoda
Synopiidae
Glandulotiron
Glandulotiron concavus

description: Glandulotiron concavus sp. nov.
(Figs 23–24)
Type fixation. Holotype, ♀.—Here designated.
Etymology. The species is named for the concavity of the interantennal head lobe.
Material examined. Holotype, ♀, 10.6 mm. Australia, Tasmania, Western Bass Strait, 15 km S of Port Fairy, 38˚32.00’S, 142˚28.36’E, 52 m, medium sand, R. Wilson, 20 November 1981, RV Tangaroa, stn BSS187, NMV J72716.
Paratypes. Same data as holotype, NMV J75154 (1 ♂). Australia, Tasmania, Central Bass Strait, 35 km NNE of Cape Wickham, King Island, 39˚16.00’S, 144˚05.24’E, 82 m, sandy shell, S-M grab, R. Wilson, 23 November 1981, RV Tangaroa, stn BSS204, NMV J73713 (1 ♀). Australia, Victoria, Western Bass Strait, 55 km SW of Cape Otway, 39˚16.42’S, 143˚06.42’E, 95 m, medium sand, rock dredge, R. Wilson, 21 November 1981, RV Tangaroa, stn BSS193, NMV J73719 (1 ♀). Australia, Tasmania, Eastern Bass Strait, 63 km E of North Point, Flinders Island, 39˚40’48’’S, 148˚49’36’’E, 124 m, muddy sand, 14 November 1981, RV Tangaroa, stn BSS167, NMV J73721 (3 specimens). South Australia, St Francis Island, Nuyts Archipelago, off Ceduna, 32˚30’S 133˚17’E, NMV J73755 (1 ovigerous ♀). Australia, Tasmania, Western Bass Strait, 59 km WNW of Cape Farewell, King Island, 103 m, coarse sand, pipe dredge, G.C.B. Poore, 20 October 1980, HMAS Kimbla, stn BSS81, NMV 73756 (1 specimen). Australia, Victoria, Western Bass Strait, 80 km WSW of Cape Otway, 39˚59’S, 142˚37’E, 94 m, coarse sand, S-M grab, G.C.B. Poore, 9 October 1980, HMAS Kimbla, stn BSS62, NMV J73762 (1 specimen). Australia, Victoria, Eastern Bass Strait, 28 km SSW of Marlo, 37˚59’00’’S, 148˚27’00’’E, muddy sand with fine shell, 30 July 1983, stn BSS 207, NMV J73764 (1 ♀). Australia, Tasmania, Central Bass Strait, 23 km E of Cape Rochon, Three Hummock Island, 40˚22’12’’S, 145˚17’00’’E, 40 m, sand, epibenthic sled, G. Poore et al., FV Sarda, stn BSS112, 3 November 1980, NMV J73765 (1 ♂). Australia, Tasmania, Western Bass Strait, 59 km WNW of Cape Farewell, King Island, 39˚28’S, 143˚17’E, 103 m, coarse sand, pipe dredge, G.C.B. Poore, 20 October 1980, HMAS Kimbla, stn BSS81, NMV J73769 (1 ♀). Australia, Tasmania, Central Bass Strait, 35 km N of Cape Wickham, King Island, 39˚13.36’S, 143˚55.36’E, 85 m, R. Wilson, 23 November 1981, RV Tangaroa, stn BSS205, NMV J73775 (1 ♀). Australia, Tasmania, Western Bass Strait, 59 km WNW of Cape Farewell, King Island, 39˚28’S, 143˚17’E, 103 m, coarse sand, pipe dredge, G.C.B. Poore, 20 October 1980, HMAS Kimbla, stn BSS81, NHMD 916113 (1 ♀).
Description (female). Rostrum with broadly rounded apex. Interantennal lobes broad, concave between rounded corners. Accessory eye composed of 5 appressed ommatidia.
M outhparts. Maxilla 1 palp with 6 medium sizes unidentate robust setae and single lateral elongate serrate robust seta; outer plate with row of 9 dentate robust setae. Mouthparts otherwise normal.
Antennae 1 as long as pereonite 1–5 and half of 6 combined along dorsum, peduncle article 2 about 0.6 length of 1, article 3 length 2/3 of 2, article 1 with a few dorsal and ventral penicillate seta; flagellum as long as peduncle, of 9+ articles; accessory flagellum of 4 articles. Antenna 2 as long as pereonites 1–6 and 1/3 of 7 combined along dorsum, peduncular article 4 the longest, flagellum of 7 articles, all articles except small terminal one with single slender robust seta distally, antenna otherwise sparsely setulose.
Coxal plates 1–2 rounded apex fringed with long setae; plate 3 obliquely truncate distally, crenulate with variously long setae, plate 4 broadly rounded with a few short setae.
Gnathopod 1 carpus with long setae on mid-anterior margin; propodus with 5–6 pectinate setae on posterior margin. Gnathopod 2 carpus with a few mid-anterior setae. Both gnathopods with 12–14 groups of unequally long setae along posterior margin of carpus.
Pereopods 3–4 basis sparsely setose. Pereopods 5–7 basis with posterodistal rounded projection; pereopod 5 and 6 basis broadest distally; pereopod 5 basis with concave posterior margin, pereopod 6 posterior margin straight, pereopod 7 broadest proximally, posteroproximal expansion broadly rounded, posterior margin broadly convex crenulate with tiny setules in indentations. Pereopods 6 and 7 with long setae in submarginal row on medial surface.
Uropod 1 peduncle reaching to end of peduncle of uropod 2, rami of equal length, about 2/3 length of peduncle, reaching beyond end of rami of uropod 2 with 1/5 of its length, outer ramus with 3 short dorsal robust setae, inner ramus with 3 long dorsal robust setae. Uropod 2 outer ramus slightly shorter than inner ramus; inner ramus peduncle and outer ramus both with 4 short dorsal robust setae; inner ramus with 3 long robust setae. Both uropods 1 and 2 reaching barely halfway along outer ramus of uropod 3. Uropod 3 peduncle about 2/3 length of outer ramus, outer ramus basal article with row of 9 robust setae dorsolaterally, and 5 very small robust setae ventrolaterally, small second article with 3 dorsal robust setae; inner ramus reaching to 4/5 of basal article of outer ramus, dorsal margin with row of long setae and 2 robust setae, apex with 3 robust setae.
Telson. Length/width 2.0, reaching 0.5 along outer ramus of uropod 3, with row of 4–5 robust setae, a number of small simple setae and a few short plumose setae on each lobe, 1 long and 1 short robust seta apically at each lobe.
Male. Generally as female except for sexual characters of the antennae.
Size. Largest ♀, 10.6 mm, ovigerous. Largest ♂, 8.4 mm.
Distribution. Australia, Bass Strait, 52– 103 m.
description: Published as part of 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), pp. 1-89 in Zootaxa 5139 (1) on pages 42-45, DOI: 10.11646/zootaxa.5139.1.1, http://zenodo.org/record/6572023