Pratinas ludmilla, Stoddart & Lowry, 2010

Stoddart, H. E. & Lowry, J. K., 2010, The family Aristiidae (Crustacea: Amphipoda: Lysianassoidea) in Australian waters, Zootaxa 2549 (1), pp. 31-53 : 50-51

Pratinas ludmilla sp. nov.

( Figs 19–21 )

Type material. HOLOTYPE, female, approx. 2.5 mm, AM P.81149, East Point, Darwin, Northern Territory, Australia, approx. 12°27'S 130°50'E, possibly on encrusting ascidian Didemnum psammatode , stn. EP/9 [ AM stn NT-108]. PARATYPES: 1?male, 2.0 mm, AM P.81150 and 1 female, 2.6 mm, AM P.81151 and 100 specimens, AM P.81152 and 20 specimens, NTMAG, same data as holotype; 20 specimens, AM P.81153, west end of East Point, north end of Fannie Bay, Darwin, Northern Territory, Australia, 11°24.5'S 130°48.5'E, gorgonaceans Echinogorgia sp. 1 (red) and Echinogorgia sp. 2 (orange), 8–10 m, 26 October 1982, J.K. Lowry, stn NT-95; 3 specimens, AM P.81154, west end of East Point, north end of Fannie Bay, Darwin, Northern Territory, Australia, 11°24.5'S 130°48.5'E, 8–10 m, gorgonacean Rumphella aggregata , 26 October 1982, J.K. Lowry, stn NT-96.

Type locality. East Point , Darwin, Northern Territory, Australia, approx. 12°27'S 130°50'E .

Etymology. The species is named for Ludmilla Creek in the East Point/Fannie Bay area.

Description. Head lateral cephalic lobe broadly triangular, apically subacute; eyes well developed, oval. Antenna 1 accessory flagellum 2-articulate. Epistome and upper lip with small central notch. Mandible lacinia mobilis absent; molar absent. Maxilla 1 inner plate with 3 apical pappose setae; outer plate with 7 setal-teeth in a 5/2 arrangement, most with moderate number of cusps. Maxilliped palp 4-articulate, palp article 1 with lateral and medial margins about same length.

Gnathopod 1 subchelate; carpus shorter than propodus, without posterodistal lobe; propodus posterior margin dentate, with 1 robust seta along posterior margin. Gnathopod 2 carpus longer than propodus. Pereopods 5–7 propodus with anterodistal spur. Pereopod 5 coxa posterior lobe deeper than anterior lobe, short, distally rounded; basis moderately expanded posteriorly, with posteroventral lobe. Pereopod 6 coxa posterior lobe deeper than anterior lobe, short, distally rounded; basis greatly expanded posteriorly, with posteroventral lobe. Pereopod 7 basis moderately expanded posteriorly, posterior margin evenly curved, with posteroventral lobe, posteroventral corner rounded.

Epimeron 3 posterior margin smooth, posteroventral corner subacute. Urosomite 1 smooth dorsally, without a dorsodistal boss. Urosomite 3 without dorsolateral flanges. Uropod 3 rami without robust setae; inner ramus longer than article 1 of outer ramus. Telson longer than broad, entire, emarginate, without middorsal robust setae, lateral margins straight, uniformly tapering distally, without robust setae on lateral margins, with 2 small apical robust setae along distal margin.

Distribution. Darwin, Northern Territory, Australia in 8–10 m depth.

Figures

FIGURE 19. Pratinas ludmilla gen. sp. nov. Paratype, female, 2.6 mm, AM P.81151.

FIGURE 20. Pratinas ludmilla gen. sp. nov. Holotype, female, 2.5 mm, AM P.81149. Scales represent 0.1 mm.

FIGURE 21. Pratinas ludmilla gen. sp. nov. Holotype, female, 2.5 mm, AM P.81149. Scales represent 0.1 mm.