Leucothoe eumilli, White & Thomas, 2009

White, Kristine N. & Thomas, James Darwin, 2009, Leucothoidae *, Zootaxa 2260 (1), pp. 494-555 : 508-511

Leucothoe eumilli sp. nov.

( Figs 9 , 10 )

Type material. Holotype, male, 2.2 mm, AM P 80177, Fantome Island (~ 18°39'S 146°30'E), pink ball sponge, 3 m, K. N. Klebba, 23 May 2004 ( JDT / OPH 23 ).

Type locality. Fantome Island , Queensland, Australia (~ 18°39'S 146°30'E) .

Etymology. After the native Manbarra Aboriginal word, ‘ Eumilli ’, meaning ‘Fantome Island’ and referring to the type locality.

Description. Based on holotype, male, 2.2 mm, AM P80177.

Head. Head length less than pereonite 1+2, anterior margin with cusp, without serrations or teeth, anterodistal margin rounded, ventral cephalic keel subquadrate, rostrum small to medium; eyes with 10 or more ocelli, round. Antenna 1 0.3 x body length; flagellum 7-articulate, peduncle width less than 2 x article 2. Antenna 2 0.3 x body length, shorter than antenna 1; flagellum 4-articulate. Mandibles lacking molars; palp 3- articulate, ratio of articles 1 – 3, 1.0:1.4:0.6, article 2 with 4 distal setae and 1 proximal seta, article 3 with 2 distal setae; incisors strongly dentate; left mandible lacinia mobilis large, strongly toothed, with 11 accessory setae; right mandible missing. Upper and lower lips and maxillae 1 and 2 missing. Maxilliped inner plates fused, distal margin with v-shaped indentation, with short spines; outer plate smooth, reduced, reaching much less than half of palp article 1, with 2 distal setae and 1 distal spine; palp 4-articulate, article 4 wide, slightly recurved.

Pereon. Coxae 1–4 relative widths 1.0:1.3:0.7:1.4. Gnathopod 1 coxa smooth, bare, anterodistal corner produced, broadly rounded, distal margin rounded, posterodistal margin excavate, facial setae absent; basis constricted proximally, anterior and posterior margins bare; ischium with 1 posterodistal seta; carpus and propodus distally tapered, carpus length 25 x width, proximal margin smooth, distal margin bare; propodus straight, palm serrate with 3 distal setae; dactylus smooth, reaching 0.5 x propodus length. Gnathopod 2 coxa length subequal to width, much wider than coxa 3, smooth, bare, anterodistally rounded, distal margin evenly rounded, posterior margin rounded, facial setae absent; basis slightly widened distally, without tubercles or serrations, anterior margin with 3 setae, posterior margin with 1 seta; ischium with 2 facial and 1 posterodistal seta; carpus 0.6 x propodus length, straight, distally truncate, anterior margin smooth; propodus posterior margin without spines/serrations, with 1 mediofacial setal row displaced to midline, reaching 0.4 x propodus length, 1 row of 3 submarginal setae, palm convex with 2 minor projections; dactylus recurved, proximal margin smooth, anterior margin distally acute, reaching 0.7 x propodus length. Pereopod 3 coxa length 1.3 x width, anterodistal corner over-riding distal face of coxa 2, not extending below it, smooth, bare, anterior margin straight, distal margin oblique, posterior margin evenly rounded, facial setae absent. Pereopod 4 coxa smooth, bare, anterior margin evenly rounded, distal margin evenly rounded, posterior margin mildly excavate, facial setae absent. Pereopods 5–7 coxa facial setae absent; basis width length ratios 1:1.3, 1:1.2, 1:1.2, posterior margins smooth, bare.

Pleon. Epimeron 1 with 1 ventral seta. Epimeron 2 with 3 ventral setae. Epimeron 3 bare, posteroventral margin produced. Uropods 1–3 relative lengths 1.0:0.7:1.1; inner and outer ramus lined with short marginal setae, with robust setae. Uropod 1+3 peduncle subequal to inner ramus length; outer and inner ramus subequal in length. Uropod 2 peduncle 1.3 x inner ramus length; outer ramus 0.8 x inner ramus length. Telson 1.8 x longer than wide, apex bidentate.

Female (sexually dimorphic characters). Unknown.

Habitat. In pink ball sponge on patch reef.

Remarks. Leucothoe eumilli sp. nov. is distinct in its anterior head cusp, its distally truncate gnathopod 2 carpus and its extremely short mediofacial setal row. A bidentate telson is also found in L. basilobata , L. cheiriserra , L. commensalis , Leucothoe ctenochasma Moore, 1987 , Leucothoe diemenensis Myers, 1985 c , Leucothoe laticoxa Ledoyer, 1978 a and Leucothoe sparsa sp. nov.

Distribution. Australia. Queensland: Fantome Island (current study).

Figures

FIGURE 9. Leucothoe eumilli sp. nov., holotype, male, 2.2 mm, AM P80177 (JDT/OPH 23), Fantome Island, Great Barrier Reef.

FIGURE 10. Leucothoe eumilli sp. nov., holotype, male, 2.2 mm, AM P80177 (JDT/OPH 23), Fantome Island, Great Barrier Reef.