Ampelisca dingaal, King, 2009

King, Rachael A., 2009, The structure of the cataract causing P 23 T mutant of human gamma-D crystallin, Zootaxa 2260, pp. 132-142 : 135-138

Ampelisca dingaal sp. nov.

( Figs 2 , 3 )

Type material. Holotype female, 7.1 mm, AM P75520, Cobia Hole , Lizard Island (14°39.154’S, 145°26.851’E), coarse sediment, patches of reef and sand, 17 m, J.K. Lowry, 25 February 2005 (QLD 1666) . Paratype: 1 female, 6.7 mm, AM P75521, same station data .

Type locality. Cobia Hole , Lizard Island, Queensland, Australia (14°39.154’S, 145°26.851’E) .

Etymology. Named for the Dingaal people: an aboriginal group that have traditionally used Lizard Island as a ceremonial place.

Description. Based on holotype, female, 7.1 mm, AM P75520.

Head. Head longer than deep, distal margin concave, anteroventral margin straight; two eyes present per side in the form of distinct lenses. Antenna 1 distinctly shorter than peduncle of antenna 2; peduncular article 2 longer (1.3 x) than article 1. Antenna 2 about as long as body.

Pereon. Coxa 1–3 each with a small posteroventral spine, spines becoming smaller progressively. Gnathopod 1 coxa similar length to coxa 2 and 3, distally rounded, with a row of 6–9 distal plumose setae and a row of 6–9 simple setae set behind the plumose setae on the outer face; basis with 4–5 long setae (plumose and simple) on the dorsal margin and 7–9 long setae (plumose and simple) on the ventral margin; ischium with scattered setae on ventral margin; merus with row of setae on ventral margin; carpus without setae on dorsal margin, with fringe of setae on ventral margin; propodus dorsal margin setose, ventral margin with fringe of setae; dactylus more than half length of propodus with 3 plumose setae on ventral margin. Gnathopod 2 coxa distally convex, with a row of 6–8 distal plumose setae and a row of 5–6 simple setae set behind the plumose setae on the outer face; basis with 3–4 setae (plumose and simple) on the dorsal margin and 4–5 long setae (plumose and simple) on the ventral margin; ischium with scattered setae on ventral margin; merus with scattered setae on ventral margin; carpus with 4–5 setae on dorsal margin, ventral margin with up to six oblique setal rows along margin; propodus dorsal margin setose, ventral margin with rows of plumose and simple setae; dactylus more than half length of propodus with 3 plumose setae on ventral margin. Pereopod 3 coxa distally convex, with a row of 3–4 distal setae and a row of 5–6 smaller setae set behind on the outer face; basis with 3–4 setae on the dorsal margin and scattered setae on the ventral margin; ischium with scattered setae on ventral margin; merus with rows of 3–4 plumose setae distally on both the dorsal and ventral margins; carpus with 1–2 plumose setae on dorsal margin, ventral margin with 5–6 plumose setae; propodus dorsal margin setose, ventral margin with 1–2 setae; dactylus longer than carpus and propodus lengths combined. Pereopod 4 coxa with 5–7 distal setae and a row of 4–5 setae set behind on the outer face; basis with 7–8 long setae on the dorsal margin (plumose and simple) and 10–11 long setae (plumose and simple) on the ventral margin; ischium with 3–4 long plumose setae on the ventral margin; merus with a row of 16–20 long plumose setae on both the dorsal and ventral margins; carpus dorsal margin with a single plumose seta, ventral margin with 4–5 plumose setae; propodus with simple seta on dorsal and ventral margins; dactylus longer than carpus and propodus combined. Pereopod 5 basis with 4 long plumose seta on anterior margin. Pereopod 6 basis with 2 long plumose setae on anterior margin. Pereopod 7 basis strongly expanded distally, widest distally, distal expansion not reaching past distal end of ischium, distal margin densely setose; ischium longer than merus; merus anterior lobe slightly produced along anterior margin of carpus; carpus short (about as long as broad), anterior and posterior lobes slightly extending around propodus; propodus elongate (less than 2 times as long as broad), inflated (laterally convex), posterior margin with lateral tuberculation; dactylus tapering distally, curved, shorter than propodus, posterior margin with tuberculation.

Pleon. Epimeron 1 distal margin evenly rounded, with anterior facing hooked seta. Epimeron 2 posteroventral corner rounded with very small notch and seta. Epimeron 3 posteroventral corner with acute spine. Urosomite 1 dorsal margin with distally rounded and upturned carina. Uropod 1 reaching to uropod 2 rami; peduncle with one large and one small robust setae; inner ramus shorter than outer ramus, outer ramus with lateral row of sensory setae. Uropod 2 outer ramus shorter than inner ramus, inner ramus with one lateral row of short robust setae; outer ramus with a large subterminal robust seta. Uropod 3 inner ramus slightly serrate along inner distal half, with 0–3 plumose setae; outer ramus serrate along inner margin, with up to 7 plumose setae, inner margin broadest at first third length. Telson dorsal surface with two rows of 4 pairs of setae, distal margin with a deep notch, with subdistal setae.

Male (sexually dimorphic characters). Unknown.

Habitat. Marine littoral, 17 m, coarse sediments and sands.

Remarks. Ampelisca dingaal sp. nov. is known from two female specimens collected in coarse sand, reef patches and fine sand. This species fits within the Ampelisca australis –group recognised by Lowry & Poore (1985) ( A. australis , A. dimboola , A. tilpa , A. toora , A. yuleba ) by its possession of broadly lanceolate rami on uropod 3 with swimming setae on the inner margins, short basis on pereopod 7 (not reaching past ischium), inflated propodus on pereopod 7 and long telson with mid-dorsal setae. With the exception of A. tilpa (as illustrated by Lowry & Poore (1985)) all these species also possess an anterior facing hooked robust seta on the anterodistal margin of epimeron 1, as does A. dingaal . Ampelisca dingaal can be easily distinguished from A. dimboola and A. toora by its small rounded carina on urosomite 3 and rounded distal end of the basis of pereopod 7. Ampelisca dingaal can be distinguished from A. australis and A. yuleba because it possesses an elongate mandibular palp and uropod 3 inner ramus without setae. The presence of two distinct eye lenses without additional pigmentation, short antenna 1 and setation of uropod 3 separates this species easily from A. jiigurru sp. nov. Ampelisca dingaal most closely resembles A. tilpa but possesses a narrow telson with 4–5 pairs of dorsal setae, curved dactylus on pereopod 7, and a defined single large robust seta on the outer ramus.

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

Figures

FIGURE 2. Ampelisca dingaal sp. nov., holotype, female, 7.1 mm, AM P75520, Cobia Hole, Lizard Island, Great Barrier Reef.

FIGURE 3. Ampelisca dingaal sp. nov., holotype, female, 7.1 mm, AM P75520, Cobia Hole, Lizard Island, Great Barrier Reef.