Bamarooka dinjerra, Lowry & Stoddart, 2002

Lowry, J. K. & Stoddart, H. E., 2002, The Amaryllididae of Australia (Crustacea: Amphipoda: Lysianassoidea), Records of the Australian Museum 54, pp. 129-214 : 182-185

Bamarooka dinjerra n.sp.

Figs. 48–50

Type material. HOLOTYPE, female, 4.8 mm, with 4 embryos, AM P36890; 1 PARATYPE, male, 3.2 mm, AM P36891; northwest of Port Hedland, North West Shelf, Western Australia, eastern Indian Ocean , 20°00.3'S 117°00.4'E to 20°00.5'S 117°00.0'E, 53 m, epibenthic sled, 22 February 1983, FRV Soela , CSIRO NWS stn 01.B17.S. 1 PARATYPE, AM P58123, same locality, 19°05.2'S 118°57.6'E to 19°05.3'S 118°56.7'E, 82 m, epibenthic sled, 14 February 1983, FRV Soela , CSIRO NWS stn 01.B10.S. 5 PARATYPES, AM P36892, same locality, 19°59.3'S 117°03.6'E to 19°59.6'S 117°03.0'E, 52 m, epibenthic sled, 22 February 1983, FRV Soela , CSIRO NWS stn 01.B16.S. 1 PARATYPE, AM P36893, same locality, 19°56.9'S 117°53.7'E to 19°56.4'S 117°53.8'E, 42–43 m, epibenthic sled, 22 April 1983, FRV Soela , CSIRO NWS stn 02.B2.S. 1 PARATYPE, AM P36894, same locality, 19°28.6'S 118°55.0'E to 19°28.2'S 118°55.5'E, 40– 38 m, epibenthic sled, 26 April 1983, FRV Soela , CSIRO NWS stn 02.B9.S. 1 PARATYPE, AM P36895, same locality, 20°00.2'S 117°00.5'E to 20°00.4'S 116°59.9'E, 52 m, epibenthic sled, 4 September 1983, FRV Soela , CSIRO NWS stn 04.B17.S. 1 PARATYPE, AM P36896, same locality, 19°55.5'S 117°55.8'E to 19°55.1'S 117°56.2'E, 40–41 m, epibenthic sled, 26 October 1983, FRV Soela , CSIRO NWS stn 05.B3.S. 1 PARATYPE, NMV J13936 , same locality, 20°01'S 117°17'E to 20°00'S 117°18'E, 46 m, coarse shell, dredge, G.C.B. Poore & H.M. Lew Ton, FRV Soela, 2 June 1983, FRV Soela , NMV stn NWA-5.

Type locality. Northwest of Port Hedland, North West Shelf, Western Australia, eastern Indian Ocean , 20°00.3'S 117°00.4'E to 20°00.5'S 117°00.0'E, 53 m depth.

Description. Based on holotype female, 4.8 mm, (AM P36890). Head much deeper than long, anterior margin with notch extended into a slit; rostrum present, anteriorly rounded; eye present, ventrally tapered. Antenna 1 peduncular article 1 not ball-shaped proximally, distal margin with small medial spine; peduncular article 2 medium length; flagellum without callynophore, calceoli absent. Antenna 2 flagellum about as long as that of antenna 1, without calceoli. Mouthpart bundle subconical. Epistome/ upper lip almost straight (lateral view). Mandible lacinia mobilis a stemmed, distally-cusped blade; accessory setal row with intermediate setae; palp article 2 without posterodistal setae, article 3 without A3-seta. Maxilliped outer plate with distal margin smooth, medial margin without notch.

Gnathopod 1 carpus subequal in length to propodus (0.9×); propodus, posterior margin without robust setae. Gnathopod 2 palm acute, with no lateral robust setae, 1 medial robust seta. Pereopods 3 and 4 merus and carpus without setal fringe. Pereopod 4 coxa with anterior margin slightly obtuse, posterior margin rounded, anteroventral corner rounded. Pereopods 5–7 with distal articles elongate, dactyli long and slender. Pereopod 5 basis expanded posteriorly, rounded with sloping posteroproximal shoulder. Pereopod 7 basis rounded posteriorly, posteroventral corner rounded, posteroventral margin curved.

Epimeron 3 posterior margin smooth, with notch well above rounded posteroventral corner. Uropod 1 peduncle dorsolateral margin with 7 robust setae; outer ramus without large spines between robust setae. Uropod 2 inner ramus slightly constricted. Uropod 3 rami lanceolate; without plumose setae; outer ramus 1-articulate. Telson moderately cleft (about 33%).

Male (sexually dimorphic characters). Based on paratype male, 3.2 mm, AM P36891. Antenna 1 flagellum with callynophore. Antenna 2 flagellum with calceoli. Mandible palp article 2 with 3 posterodistal setae.

Etymology. The specific name is an Australian Aboriginal word meaning “west”.

Remarks. Most species of Bamarooka ( B. bathycephala , B. dinjerra , B. endota and B. kimbla ) have ventrally tapered eyes. Bamarooka dinjerra and B. endota are very similar. They differ in the basis of pereopod 5, which has a sloped proximal posterior shoulder in B. dinjerra and is almost round in B. endota .

Habitat. Generally not known; taken on one occasion on a coarse shell bottom.

Distribution. North West Shelf, off Western Australia, Indian Ocean; 40–82 m depth.