Amaryllis migo, 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 : 157-160

Amaryllis migo n.sp.

Figs. 23–25

Type material. HOLOTYPE, female, 10.2 mm, ovigerous (with 1 embryo), AM P 37173; 1 PARATYPE, male, 5.2 mm, AM P 37174 ; 3 PARATYPES, AM P 37175; rocks near Migo Island, Port Harding, Torbay Bay , Western Australia, 35°04'S 117°39'E, 6–7 m, algae and sponge , J. K. Lowry , 15 December 1983, stn WA-154. 11 PARATYPES, AM P 37176, type locality, 6–7 m, small branched alga with compound ascidian on underside of branches , R. T. Springthorpe & J. K. Lowry, 15 December 1983, stn WA-152 .

Additional material. SOUTH AUSTRALIA: 1 specimen, AM P 37177, Vivonne Bay, Kangaroo Island, [approx. 36°00'S 137°05'E], H. M. Hale and Tindale, January 1926, AM stn SA- 85. 7 specimens, NMV J 13978 , NE side of Topgallant Island, Investigator Group, 33°43.0'S 134°36.6'E, 20 m, a brown alga Cystophora and a red alga, Plocamium, G.C.B. Poore & K. Brandon , 21 April 1985, NMV stn SA- 80. 1 specimen, NMV J 13979 , same locality, 7 m, Acrocarpia anciculata and red algae, S. Shepherd & G. C. B. Poore, 20 April 1985, NMV stn SA- 83. 2 specimens, NMV J 13985 , The Hotspot Reef, W of Flinders Island, 33°40.8'S 134°22.5'E, 21 m, erect hard bryozoan on vertical rock face, G. C. B. Poore, 22 April 1985, NMV stn SA- 83. WESTERN AUSTRALIA: 3 specimens, NMV J 13986 , N side of Cape Riche, 34°37'S 118°47'E, 5 m, coralline and red algae, G. C. B. Poore & H. M. Lew Ton, 14 April 1985, NMV stn SWA-51. 27 specimens, AM P 37178, 2 km SE of South Point, Two Peoples Bay, 34°58'S 118°12'E, 6–10 m, alga with compound ascidian on back of fronds, J. K. Lowry, 16 December 1983, stn WA-177.

Type locality. Migo Island, Port Harding, Torbay Bay , Western Australia, 35°04'S 117°39'E, 6–7 m depth .

Description. Based on holotype female, 10.2 mm. 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 ball-shaped proximally, distal margin without a medial spine; peduncular article 2 medium length; flagellum with weak callynophore, calceoli absent. Antenna 2 flagellum about as long as that of antenna 1, without calceoli. Mouthpart bundle subconical. Epistome/ upper lip with broad mid-anterior bulge (lateral view). Mandible lacinia mobilis a stemmed, distally-cusped blade; accessory setal row with intermediate setae; palp article 2 with 3 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; propodus, posterior margin without robust setae. Gnathopod 2 palm slightly acute, with no or 1 lateral robust seta, 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 rounded posteriorly, posteroventral corner rounded, posteroventral margin curved.

Epimeron 3 posterior margin serrate, with notch well above rounded posteroventral corner. Uropod 1 peduncle dorsolateral margin with 9 robust setae; outer ramus with 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 32%).

Male (sexually dimorphic characters). Based on paratype, male, 5.2 mm, AM P 37174. Antenna 1 with strong callynophore. Antenna 2 flagellum with calceoli. Mandible palp article 2 with 5 posterodistal setae. Gnathopod 2 palm without lateral robust setae .

Etymology. The species is named after its type locality, Migo Bay.

160 Records of the Australian Museum (2002) Vol. 54 represent 0.5 mm.

Remarks. Amaryllis migo is most similar to other Amaryllis species with a serrate posterior margin on epimeron 3, such as A. carrascoi , A. croca , A. dianae and A. keablei . Amaryllis dianae , A. carrascoi and A. migo all have a notch well above the posteroventral corner of epimeron 3, and only small serrations above the notch. Amaryllis migo is the only one of these three species with a rounded posteroventral corner on the basis of pereopod 7; it is the only species of Amaryllis with large spines between the robust setae of uropod 1 outer ramus.

Habitat. Amaryllis migo has been collected mostly from algae.

Distribution. Southern coast of Australia; 5–21 m depth.