Anamixis bazimut Thomas, 1997

White, Kristine N. & Thomas, James Darwin, 2009, Leucothoidae *, Zootaxa 2260 (1), pp. 494-555 : 495-498

Anamixis bazimut Thomas, 1997

( Figs 1 , 2 )

Anamixis bazimut Thomas, 1997: 45–47 , fig. 2. — Lowry & Stoddart, 2003: 154 (catalogue).

Material examined. 1 male, AM P70802 ( QLD1649 ) ; 1 male, AM P70977 ( QLD 1684 ) ; 2 males, AM P71542 ( QLD 1823 ) ; 3 males, AM P71505 ( QLD 1823 ) ; 1 male, GCRL2882 (SEL/LZI-2-1) ; 1 male, GCRL2883 (SEL/LZI-2-3) ; 1 male, AM P79867 (SEL/LZI-2-7).

Type locality. Tab Anchorage , Madang, Papua New Guinea (05°10.3’S 145°50.6’E) .

Description. Based on male, 2.8 mm, AM P79867.

Head. Head length less than pereonite 1 + 2, anterior margin transverse, without serrations or teeth, anterodistal margin quadrate with cusp, ventral cephalic keel subquadrate, rostrum large; eyes round, with 10 or more scattered ocelli. Antenna 1 0.3 x body length; flagellum 8-articulate, peduncle width less than 2 x article 2. Antenna 2 0.3 x body length, shorter than antenna 1; flagellum 2-articulate. Maxilliped inner plates fused, reduced, distal margin with small cleft, bare; outer plate smooth, reduced, not extending past base of palp article 1, bare; palp 4-articulate, article 4 elongate, extremely slender, strongly recurved.

Pereon. Coxae 1–4 relative widths 1.0:2.8:3.2:3.1. Gnathopod 1 coxa smooth, bare, anterodistal corner not produced, truncate, distal margin with v-shaped projection, posterodistal margin quadrate, facial setae absent; basis constricted proximally, anterior and posterior margins bare; ischium bare; carpus and propodus narrow; carpus length 16 x width, distal margin bare; propodus evenly curved, posterior margin tuberculate, palm dentate with 12 distal setae, geniculate; dactylus absent. Gnathopod 2 coxa length 2 x width, slightly narrower than coxa 3, anterior margin smooth, anterodistally subquadrate; distal margin produced, posterior margin straight, facial setae absent; basis widened distally, without tubercles or serrations, anterior margin with 4 setae, posterior margin bare; ischium with 2 anterodistal setae; carpus subequal in length to propodus, straight, distally tapered, anterior margin smooth, anterodistal margin with indentation; propodus posterior margin without teeth/serrations, with 1 mediofacial setal row above midline, reaching 0.2 x propodus length, 1 row of 5–7 submarginal setae, palm linear with 1 major projection; dactylus slightly recurved with paired setae on posterior margin, anterior margin distally subacute, reaching 0.5 x propodus length. Pereopod 3 coxa length 1.3 x width; anterodistal corner over-riding distal face of coxa 2, not extending below it; distal margin straight with posterior cusp, bare, posterior margin straight, facial setae absent. Pereopod 4 coxa anterior margin slightly concave, distal margin rounded with posterior cusp, posterior margin straight, facial setae absent. Pereopods 5–7 coxa facial setae absent; basis width length ratios 1:1.3, 1:1.5, 1:1.5. Pereopods 5–6 posterior margins smooth, bare. Pereopod 7 basis posterior margin smooth, setose.

Pleon. Epimera 1–3 bare. Epimeron 3 posteroventral corner produced. Uropods 1–3 relative lengths 1.0:0.8:1.1; inner and outer ramus with robust setae. Uropod 1+3 peduncle subequal to inner ramus length. Uropod 2 peduncle 0.5 x inner ramus length. Uropods 1–2 outer ramus 0.6 x inner ramus length. Uropod 3 outer ramus 0.8 x inner ramus length. Telson 1.4 x longer than wide, with 2 plumose dorsofacial setae, apex rounded.

Female (sexually dimorphic characters). Leucomorphs unknown.

Habitat. In sponges and a species of Halimeda Lamouroux, 1812 , from coral rubble and sandy bottom on a patch reef in the channel between outer reefs. Thomas (1997) reported the Papua New Guinea specimens from small asconoid sponges in rubble areas.

Remarks. Anamixis bazimut is distinct from all other species in the following characters: transverse anterior head margin, subquadrate distal keel projecting below the head, gnathopod 3 coxa slightly shorter than gnathopod 2 and pereopod 4 coxa and its produced coax 2 distal margin. This species is similar to Anamixis kateluensis and Anamixis moana Thomas, 1997 in its subequal coxa 2 – 4, broad ventral cephalic keel and its general shape and morphology of gnathopod 2. Anamixis bazimut and A. kateluensis both have apical processes on the inner plates of the maxilliped, whereas A. moana has truncate inner plates.

Distribution. Australia. Queensland: Lizard Island to Orpheus Island (current study); Great Barrier Reef ( Lowry & Stoddart 2003). Papua New Guinea: Bismarck Sea, Madang Lagoon ( Thomas 1997).

Figures

FIGURE 1. Anamixis bazimut Thomas, 1997, male, 2.8 mm, AM P79867 (SEL/LZI-2-7), Picnic Beach, Palfrey Island, Great Barrier Reef.

FIGURE 2. Anamixis bazimut Thomas, 1997, male, 2.8 mm, AM P79867 (SEL/LZI-2-7), Picnic Beach, Palfrey Island, Great Barrier Reef.