Amaryllis spencerensis, 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 : 173-175

Amaryllis spencerensis n.sp.

Figs. 38–40

Type material. HOLOTYPE, female, 16.0 mm, ovigerous (15 eggs), AM P 37096; 3 PARATYPES, female, AM P 37097; 19 km from Mount Young, toward Wallaroo, Spencer Gulf , South Australia, [approx. 33°18'S 137°31'E], 18 m , K. Sheard on FL Whyalla, 8 March 1938. 1 PARATYPE, male, 11.0 mm, AM P 37098, Western Shoal, Spencer Gulf , South Australia, [approx. 33°09'S 137°31'E], 9 m , K. Sheard on FL Whyalla, 10 March 1938 . 2 PARATYPES, female, SAMA C5987 , Dangerous Reef, Spencer Gulf , South Australia, [approx. 34°49'S 136°12'E], dredged , K. Sheard .

Additional material. Three females, AM P 37099, unknown locality in Spencer Gulf and/or Gulf St Vincent, South Australia.

Type locality. 19 km from Mount Young, toward Wallaroo, Spencer Gulf , South Australia, [approx. 33°18'S 137°31'E], 18 m depth .

Description. Based on holotype female, 16.0 mm, AM P37096. Head much deeper than long, anterior margin with notch extended into a slit; rostrum absent; eye present, elongate, reniform. Antenna 1 peduncular article 1 not ballshaped proximally, distal margin with well-developed 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 with strong mid-anterior angle (lateral view). Mandible lacinia mobilis a stemmed, distally-cusped blade; accessory setal row with intermediate setae; palp article 2 with 2 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 slightly acute, with 2 lateral robust setae, 1 medial robust seta. Pereopods 3 and 4 merus and carpus without setal fringe. Pereopod 4 coxa with anterior and posterior margins subparallel, anteroventral corner rounded. Pereopods 5–7 with distal articles elongate, dactyls short and stocky. Pereopod 5 basis expanded posteriorly, rounded. Pereopod 7 basis subrectangular, posteroventral corner notched, posteroventral margin straight.

Epimeron 3 posterior margin smooth, with notch well above rounded posteroventral corner. Uropod 1 peduncle Lowry & Stoddart: Australian Amaryllididae (Amphipoda) 175 dorsolateral margin with 17 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 37%).

Male (sexually dimorphic characters). Based on paratype male, 11 mm, AM P 37098. Antenna 1 flagellum with callynophore, with calceoli. Antenna 2 flagellum with calceoli. Mandible palp article 2 with 5 posterodistal setae. Gnathopod 2 palm with 1 lateral robust seta .

Etymology. Named for the type locality, Spencer Gulf.

Remarks. Amaryllis spencerensis belongs to a small group of species with a smooth posterior margin on epimeron 3 and a subrectangular basis on pereopod 7 ( A. macrophthalma , A. philatelica and A. spencerensis ). Within this group A. macrophthalma and A. spencerensis both have a welldeveloped medial spine on peduncular article 1 of antenna 1 and a notch above the rounded posteroventral corner on epimeron 3. In A. spencerensis the posteroventral corner of the basis of pereopod 7 is notched, in contrast to subquadrate in A. macrophthalma , and there are significantly less robust setae defining the palm of gnathopod 2 in the female.

Habitat. Not known.

Distribution. Known only from Spencer Gulf, South Australia; 9–18 m depth.