Ampelisca dimboola Lowry & Poore, 1985

King, Rachael A., 2009, The structure of the cataract causing P 23 T mutant of human gamma-D crystallin, Zootaxa 2260, pp. 132-142 : 133-135

Ampelisca dimboola Lowry & Poore, 1985

( Fig. 1 , Pl. 1B)

Ampelisca dimboola . — Lowry & Poore, 1985: 271–273, figs 11, 12. — Lowry & Stoddart, 2003: 52.

Material examined. 1 female, 11.8 mm, AM P75275, Reef front, Fantome Island, northern-most bay, sand sample, 3 m, J.D. Thomas, 14 February 1989 (JDT/OPH-11) .

Type locality. East of Burwood Beach , New South Wales (32º57.5'S 151º44.7'E) .

Description. Based on female, 11.8 mm, AM P75275.

Head. Head longer than deep, distal margin concave, anteroventral margin straight; two eyes present per side in the form of distinct lenses. Antenna 1 slightly shorter than peduncle of antenna 2, peduncular article 2 longer (1.5 x) than article 1. Antenna 2 distinctly shorter than body length. Mandible palp article 2 not inflated; article 3 similar length to article 2.

Pereon. Coxa 1 to 3 each with a posteroventral spine, spines becoming smaller progressively. 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, anterior lobe slightly produced along anterior margin of merus; merus anterior and posterior lobes slightly produced along anterior margin of carpus; carpus short (about as long as broad), anterior lobe extending along anterior margin of propodus; propodus not elongate (less than 2 x as long as broad), inflated (laterally convex), similar width to carpus, posterior margin with lateral tuberculation; dactylus tapering distally, straight, shorter than propodus, posterior margin with tuberculation.

Pleon. Epimeron 1 distal margin not evenly rounded, with anterior facing hooked seta. Epimeron 2 posteroventral corner with small spine. Epimeron 3 posteroventral margin convex, corner with acute spine. Urosomite 1 dorsal margin with saddle-shaped distally upturned carina. Uropod 1 reaching to uropod 2 rami; peduncle with one robust seta; rami subequal in length; outer ramus with lateral row of sensory setae. Uropod 2 outer ramus shorter than inner ramus; inner ramus with two lateral rows of short robust setae; outer ramus with two lateral rows of short robust setae and a large subterminal robust seta. Uropod 3 inner ramus not heavily serrate, with plumose setae on inner margin; outer ramus not heavily serrate, with plumose setae on inner and outer margins, inner ramus broadest at proximally. Telson dorsal surface with two rows of up to five pairs of robust setae; distal margin with 1–2 shallow notches, with subdistal setae.

Male (sexually dimorphic characters). Unknown.

Habitat. Littoral (4–53 m), sands.

Remarks. This species was described in detail by Lowry & Poore (1985). The single specimen from Fantome Island was discovered in the collections of Dr. James D. Thomas (Nova Southeastern University). While it has been identified as Ampelisca dimboola , several differences were noted between this specimen and the holotype described and illustrated by Lowry & Poore (1985). In the specimen described here (compared to the holotype) the palp articles of the mandible are more elongate, the lateral setae on the outer ramus of uropod 3 are short and there is no unguis on the dactylus of pereopod 7. However, the structures that are used most often to distinguish between the species of Ampelisca (shape of the basis of pereopod 7, urosomal carina, uropod 3 and the head) cannot be distinguished from that of the holotype of A. dimboola . Setation differences can be caused by different size/age classes of the animals but with only one specimen available it is not clear why the mandibular palp is so different. The unguis on pereopod 7 illustrated in Lowry & Poore (1985) could be a mistake as there are no other Ampelisca species with this unguis.

These specimens expand the range of this species to Queensland.

Distribution. Australia. Queensland: Fantome Island (current study). New South Wales: east of Burwood Beach; east of Malabar; Pittwater; Moona Moona Creek, Jervis Bay ( Lowry & Poore 1985). Victoria: Ninetymile Beach; Seaspray ( Lowry & Poore 1985).

Figures

FIGURE 1. Ampelisca dimboola Lowry & Poore, 1985, female, 11.8 mm, AM P75275, Reef front, Fantome Island, Great Barrier Reef.