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

description: Glandulotiron septimus sp. nov.
(Figs 25–26)
Type fixation. Holotype, ♀. — Here designated.
Etymology. This species was the seventh of the new species in the genus to be recognised, hence the Latin septimus.
Material examined. Holotype, ♀, 6.2 mm. Australia, Bass Strait, 94 km N of North Point, Flinders Island, 38˚53.42’S, 147˚55.06’E, 71 m, medium sand, R. Wilson, 17 November 1981, RV Tangaroa, stn BSS171, NMV J73766.
Paratypes. Same data as holotype, NMV J75155 (♂). Same data as holotype, NMV J75156 (13 specimens). Same date as holotype, NMV J73772 (5 small specimens). Same data as holotype, NHMD 916114 (5 specimens). Australia, Victoria, Western Bass Strait, 30 km SSW of Warrnambool, 38˚38’12’’S, 142˚35’00’’E, 59 m, R. Wilson, 20 November 1981, stn BSS188, NMV J73751, (2 specimens). Australia, Tasmania, Eastern Bass Strait, 79 km N of North Point, Flinders Island, 39˚05.12’S, 147˚56.36’E, 62 m, shelly sand, R. Wilson, 17 November 1981, RV Tangaroa, stn BSS172, NMV J73757 (1 ♂). Australia, Central Bass Strait, 65 km S of Cape Schanck, 39˚08.3’S, 144˚43.9’E, 66 m, coarse sand, R. Wilson, 23 November 1981, RV Tangaroa, stn BSS201, NMV J73758, (1 ♀). Australia, Tasmania, Central Bass Strait, 35 km N of Cape Wickham, King Island, 39˚134’36’’S, 143˚55’36’’E, 85 m, fine sandy shell, epibenthic sled, R. Wilson, 23 November 1981, RV Tangaroa, stn BSS 205, NMV J73763 (1 ♂). Australia, Tasmania, Eastern Bass Strait, 79 km N of North Point, Flinders Island, 39˚05.12’S, 147˚56.36’E, 62 m, shelly sand, R. Wilson, 17 November 1981, RV Tangaroa, stn BSS172, NMV J73767 (8, ♀♀ and small). Australia, Tasmania, Eastern Bass Strait, 79 km N of North Point, Flinders Island, 39˚05.12’S, 147˚56.36’E, 62 m, shelly sand, R. Wilson, 17 November 1981, RV Tangaroa, stn BSS172, NMV J73768 (2 ♀). Australia, Western Bass Strait, 51km SSW of Cape Otway, 39˚16’S, 143˚17’E, 90 m, medium sand, G.C.B. Poore, 10 October 1980, HMAS Kimbla, stn BSS72, NMV J73770 (1 ♀). Australia, Central Bass Strait, 65 km S of Cape Schanck, 39˚08.3’S, 144˚43.9’E, 66 m, coarse sand, R. Wilson, 23 November 1981, RV Tangaroa, stn BSS201, NMV J73771 (1 juvenile).
Description (female). Head dorsal surface smooth. Rostrum bluntly rounded. Interantennal lobes broad, elongate truncate with rounded corners, lower corner more angular than upper corner. Accessory eyes composed of 5 ommatidia, appressed in crescent.
Mouthparts. Maxilla 1 palp apex with 5 short up to 5-dentate setal spines and 1 pointed lateral seta. Mouthparts otherwise normal.
Antenna 1 as long as pereonite 1–5 combined along dorsum, peduncle article 2 about 3/4 length of 1, article 3 about half as long as article 2, article 1 with single penicillate seta ventrally in posterior half and two middorsally; flagellum as long as peduncle, of 7 articles, accessory flagellum of 4 articles. Antenna 2 as long as pereonites 1–6 combined along dorsum, peduncular article 4 the longest, flagellum of 5+ articles, several articles with single slender robust seta dorsodistally, antenna otherwise sparsely setose.
Coxal plates 1–3 distally fringed with setae of varying length, without brim of fine setules; plate3 distally obliquely truncate with a few marginal setae. Coxal plate 4 essentially naked.
Gnathopods 1 and 2 basis with a few long and short anterior setae, and longer setae along posterior margin; carpus on both with a few long setae on anterior margin, 6–8 ‘groups’ of unequally long setae along posterior margin, more dense on gnathopod 1; propodus slightly less than half as long as carpus; dactylus with unguis half as long as propodus, nearly straight. Gnathopod 1 propodus with row of 5 short, pectinate setae on posterior margin. Gnathopod 2 propodus posterior margin with scattered slender setae.
Pereopods 3–4 basis nearly naked, with a few setae in posterodistal corner.
Pereopods 5-7 basis broadly rounded distally. Pereopod 5 basis broadest in distal half, with short posteroproximal lobe. Pereopod 6 basis ovoid. Pereopod 7 basis broadest proximally with broad posteroproximal lobe, with a few long setae on medial surface, posterior margin crenulate with tiny setae in indentations, propodus about half as long as carpus.
Uropod 1 peduncle reaching about 2/3 along peduncle of uropod 2 peduncle, rami of equal length, about 3/4 length of peduncle, reaching to end of rami of uropod 2. Uropod 2 rami of subequal length. Both uropod 1 and 2 reaching about 1/3 along outer ramus of uropod 3. Uropod 3 peduncle about 3/4 length of outer ramus, rami elongate oval, reaching beyond apex of telson, outer ramus basal article with row of 5 robust setae dorsally, and 4 tiny robust setae ventrally, 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. Length about 2.5 times greatest depth in lateral view, reaching 2/3 along outer ramus of uropod 3, length/dorsal width 2.3, with row of 4 robust setae, simple setae and one plumose seta dorsally on each lobe, apices with 1 long and 1 short robust seta.
Size. Largest ♀, 6.2 mm. Largest ♂ 6.3 mm.
Distribution. Australia, Bass Strait, 62– 90 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 45-48, DOI: 10.11646/zootaxa.5139.1.1, http://zenodo.org/record/6572023