Ambicholestes (Austrolestes) thetis Just, 1998, n.sp.
Creators: name: Just, Jean
Publisher: name: Zenodo
Year: 1998
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Amphipoda
Ischyroceridae
Ambicholestes
Ambicholestes thetis

description: <i>Ambicholestes (Austrolestes) thetis</i> n.sp. Figs 17-19 <i>Siphonoecetes australis</i> Stebbing, 1910 <i>(partim,</i> Stebbing 1910, Plate 54C). Material examined. HOLOTYPE: male, 4.7 mm, Bass Strait, 63 km E of North Point, Flinders Island, 39°44.8'S 148°40.6'E, 124 m, muddy sand, epibenthic sled, R. Wilson, RV "Tangaroa", 14 November 1981, Stn BSS 167, NMV J9528. PARATYPES: 25 specimens. Eastern Bass Strait, 60 km E of North Point, Flinders Island, 39°41.7'S 148°39.5'E, 115 m, muddy sand, naturalist's dredge, G.C.B. Poore, HMAS "Kimbla", 27 March 1979, Stn BSS 32, NMV J9526 (4 specimens) and J9527 (3). Eastern Bass Strait, 63 km E of North Point, Flinders Island, Tasmania, 39°44.8'S 148°40.6'E, 124 m, muddy sand, Smith-Mclntyre grab, R. Wilson, RV "Tangaroa", 14 November 1981, Stn BSS 167 G, NMV J9529 (4). Eastern Bass Strait, 63 km E of North Point, Flinders Island, Tasmania, 39°44.8'S 148°40.6'E, 124 m, fine sand, WHOI epibenthic sled, R. Wilson, RV "Tangaroa", 14 November 1981, Stn BSS 167 S, NMV J9530 (20). New South Wales, off Cape Three Point, 40-50 fms (74-92 m), "Thetis" Expedition, Stn 13, AM P2529, (1 male, one of two former syntypes of <i>Siphonoecetes australis</i> Stebbing, 1910, see Just 1985: 333). New South Wales, off Cape Three Point, 40-50 fms (74-92 m), "Thetis" Expedition, January 1911, AM P31867 (re-registered from P2528) (1 male, probably a missing syntype of <i>Siphonoecetes australis</i> Stebbing, 1910, see Just 1985: 333). Diagnosis. <i>Austrolestes</i> without rostrum. Cephalic front margin a rounded wide triangle. Cephalon along midline as long as first <i>lllz</i> pereonites Further description. Antenna 1 peduncle article 1 with 1 recurving robust seta ventrally in proximal half. Antenna 2 peduncular article 3 without robust setae; ventroapical projection of peduncular article 2 wider than long, evenly rounded, with apical row of long setae. Male antenna 1 about as long as first 61/z pereonites with up to 7 flagellar articles. Male antenna 2 as long as cephalon, pereon and pleon combined. Coxal plates 5 and 6 with posterior lobe rounded; plate 5 without long anterior setae. Pleonal sideplates I and 2 evenly rounded. Mandibular palp overreaching mandibular incisor by about 1/10 palp length, with distolateral and medioventral cover of microsetules, tip naked. Pereopod 1 article 5 with 1 posterodistalrobust seta; article 6 with small posterodistal tooth. Pereopod 2 article 2 anterior margin straight, fringed with moderately long simple setae; article 6 with up to 5 posterior robust setae. Pereopods 5 and 6 article 2 anterodistally with 1 long and a few short setae. Uropod 1 peduncle about 21/z times longer than wide, with up to 8 distal robust setae dorsolaterally; outer ramus barely 4 times longer than broad, with 15-17 lateral robust setae, single as well as double; inner ramus c. 2/5 length of outer ramus with up to 12 lateral and apical robust setae. Urosomites 1 and 2 free. Urosomite 3 and telson fused dorsally. Size. Largest male: 4.7 mm; largest female: 3.8 mm. Colour. Not known. Biology. On muddy sand. <b>Distribution.</b> Eastern Australia: central New South Wales to eastern Bass Strait; 74-124 m depth. Etymology. The specific epithet refers to HMCS "Thetis" from which the first specimens of this species were collected off Botany Bay.
description: Published as part of <i>Just, Jean, 1998, Siphonoecetinae (Crustacea: Amphipoda: Ischyroceridae) 7: Australian Concholestids, Ambicholestes n. gen., with a Description of Six New Species, and a New, Restricted Diagnosis for Caribboecetes Just, 1983, pp. 27-54 in Records of the Australian Museum 50 (1)</i> on pages 47-49, DOI: 10.3853/j.0067-1975.50.1998.1273, http://zenodo.org/record/4656898
description: {"references": ["Stebbing, T. R. R., 1910. Scientific results of the trawling expedition of H. M. C. S. \" Thetis \". Crustacea V: Amphipoda. Memoirs of the Australian Museum 4 (12): 567 - 658.", "Just, J., 1985. Siphonoecetinae (Crustacea, Amphipoda, Corophiidae) 4: Australoecetes Just, 1983, including Stebbingoecetes subgen. n. Records of the Australian Museum 37: 325 - 34 l."]}