Birubius oti, Taylor, 2009

Taylor, Joanne, 2009, Phoxocephalidae *, Zootaxa 2260 (1), pp. 800-827 : 813

Birubius oti sp. nov.

( Figs 9 , 10 )

Type material. Holotype male, 4.5 mm, AM P77843, One Tree Island lagoon (23°30’S 152°05’E), light trap, P.S. McWilliam, 02 Dec 1977 ( DN 77–42 ) . Paratypes: 30 males, 2.0– 5.2 mm, AM P77844 ; 10 males 2.0– 5.2 mm NMV J57287 , same locality .

Additional material examined. More than 200 males, P75539, same locality as types .

Type locality. One Tree Island , Queensland, Australia .

Etymology. Named for the acronym of the type locality, One Tree Island (OTI).

Description. Based on holotype male.

Head. Rostrum unconstricted; eyes present (red pigmented in preserved specimens). Antenna 1 peduncle article 2 with ventral setae situated just proximal to middle. Antenna 2 peduncle article 4 facial robust setae not in a single row. Mandible palp article 2 with outer setae; molar simple, form D; right molar with 4 spines, without disjunct spines; right incisor with 3 teeth, right lacinia mobilis simple, right raker row of 8 teeth. Maxilla 1 inner plate with 3 setae; outer plate with 1 robust seta especially thickened. Maxilliped inner plate with 2 large thick apical robust setae; outer plates, inner margin with well developed setae.

Pereon. Coxae, long ventral setae present on coxae 1–3 but absent from coxa 4, main ventral setae of coxae 1–4 = 4–5–4–0. Coxa 1 sub rectangular. Coxa 2 widened distally. Gnathopods similar. Gnathopod 1 palms oblique. Pereopods 3–4, carpus with 3 posteroproximal robust setae, propodus slender setae absent. Pereopod 5 basis of broad form, not tapering distally, without facial ridge. Pereopod 6 basis with 2 facial ridges. Pereopod 7 basis with few or no long ventral setae, with 2 facial ridges.

Pleon. Epimeron 1 anteroventral margin with 4 setae, posteroventral face with 2 long setae, posterior pair not set vertically. Epimeron 2 with 6 facial setae, not crowded anteriorly. Epimeron 3 fully facial setae absent, with 2 long posterior setae, with 1 short ventral setae. Uropod 1, peduncle basofacial setae present, without major displaced robust setae, with 3 apicolateral spines; inner ramus of uropod 1 with 1 dorsal spine, with subapical accessory robust seta; outer ramus not continuously spinose to apex. Uropods 1–2 rami with well developed apical nails. Uropod 3 outer ramus article 2, with 2 apical setae.

Habitat. Collected in light traps.

Remarks. This new species of Birubius can be distinguished from all other species of the genus by the following combination of traits; right lacinia mobilis simple, coxa 1 not expanded distally, with 4 long ventral setae; pereopods 3–4 carpus with 3 posteroproximal robust setae, epimeron 3 without fully facial setae and the presence of 2 basofacial setae on uropod 1. This species is most easily distinguished from others from the GBR by the unconstricted rostrum, 3 posteroproximal robust setae on pereopods 3-4 carpus and the presence of a subapical accessory robust seta on uropod 1 inner ramus.

Distribution. Australia. Queensland: One Tree Island (current study).

Figures

FIGURE 9. Birubius oti sp. nov., holotype, male, 4.5 mm, AM P77843, One Tree Island, Great Barrier Reef.

FIGURE 10. Birubius oti sp. nov., holotype, male, 4.5 mm, AM P77843, One Tree Island, Great Barrier Reef.