Acidostoma merimbula, Stoddart & Lowry, 2012

Stoddart, H. E. & Lowry, J. K., 2012, Revision of the lysianassoid genera Acidostoma and Shackletonia (Crustacea: Amphipoda: Acidostomatidae fam. nov.), Zootaxa 3307 (1), pp. 1-34 : 12-13

Acidostoma merimbula sp. nov.

( Figs 9–10 )

Type material. HOLOTYPE, female, ovigerous, (at least 8 eggs), 10 mm, AM P.46666, east of Merimbula , New South Wales, Australia, 36°57.95'S 150°22'E to 36°58.41'S 150°22.14'E, 960–1050 m, thick grey mud with lumps of hard clay, dredged, 12 December 1986, R. T. Springthorpe, RV Franklin, stn FR1086-07.

Diagnostic description. Mandible molar a small, non-setose triangular flap. Maxilla 1 palp small, 1- articulate, with apical robust setae. Maxilliped inner plate well developed; outer plate with subapical notch. Gnathopod 2 dactylus reaching corner of palm. Pereopods 5 and 6 merus longer than broad. Epimeron 3 posteroventral corner produced, rounded. Uropod 1 peduncle dorsolateral margin with less than 10 robust setae. Uropod 2 peduncle dorsolateral margin not castellate, without setae. Uropod 3 reaching to about the end of uropod 2; rami longer than peduncle, without plumose setae; outer ramus article 2 small. Telson about as long as broad, moderately cleft (about 60%).

Etymology. Named for the New South Wales town of Merimbula, near the type locality.

Remarks. Acidostoma merimbula differs from A. australis as follows: maxilla 1 outer plate with 12 setalteeth; maxillipedal palp more setose; gnathopod 1 palm with more robust setae; pereopod 4 more setose; pereopod 6 coxa with better developed posteroventral lobe, merus with less pronounced posteroproximal corner; uropod 1 peduncle with long dorsomedial robust setae; telson moderately cleft.

Distribution. Off the coast of New South Wales, Australia; 960–1050 m depth.

Figures

FIGURE 9. Acidostoma merimbula sp. nov., holotype female, 10 mm, AM P.46666, east of Merimbula, New South Wales, Australia. Scales represent 0.2 mm.

FIGURE 10. Acidostoma merimbula sp. nov., holotype female, 10 mm, AM P.46666, east of Merimbula, New South Wales, Australia. Scales for U1–3, T represent 0.2 mm, remainder represent 0.5 mm.