Eucytherura indianensis, Michael, 1995

Ayress, M. A., Whatley, R., Downing, S. E. & Millson, K. J., 1995, Cainozoic and from Recent Deep Sea Cytherurid Ostracoda the South Western Pacific and Eastern Indian Oceans, Part Cytherurinae, Records of the Australian Museum 47 (2), pp. 203-223 : 212-213

Eucytherura indianensis n.sp.

" Eucytherura indianensis" Ayress, 1988 *: 611; pI. 21, figs 12 -17.

Etymology. From its occurrence in the Indian Ocean.

Type material and dimensions. Holotype, OS 14068, adult left valve, length 0.35 mm, height 0.23 mm. Paratypes: OS 14069, adult right valve, length 0.37 mm, height 0.23 mm, Site 254, core 1, section 2, interval 20- 26 cm, Pleistocene; OS 14070, adult right valve, length 0.37, height 0.23 mm, Site 254, core 1, section 3, interval 50- 56 cm, Pleistocene.

Type locality and horizon. East Indian Ocean , southern limit of Ninetyeast Ridge, present day water depth 1253 m, DSDP Site 254, core 1, section 2, interval 20-26 cm, Pleistocene .

Diagnosis. A species of Eucytherura with a very bluntly convex anterior margin and very short sub-dorsal caudal process. Coarsely reticulate with polygonal fossae; muri bear short conjunctive and disjunctive lateral spines and inwardly directed spines. Anterior half of ventral surface microreticulate. Low mid-anterior ridge extends onto posteroventral tumidity.

Description. Small, sub-quadrate in lateral view. Anterior margin bluntly convex; posterior margin with short caudal process just above mid-height. Dorsal margin straight to slightly undulating with distinct anterior cardinal angle. Ventral margin tapers upwards posteriorly, interrupted by posteroventral tumidity which overhangs and overreaches ventral margin. Lateral surface coarsely reticulate: fossae deep and polygonal, muri bear short, blunt conjunctive and disjunctive spines and fine inwardly directed spines. Low ridge extends longitudinally through mid-anterior and obliquely across ventral tumidity, interrupted medianly by thickened mural strut associated with adductor muscle scars. A second low arcuate ventro-lateral ridge borders a sub-ovate microreticulate region in anterior half of ventral surface. Internal surface with clusters of 6-7 perforations. Other internal features as for genus.

Comparisons. The species is similar to E. calabra (Colalongo & Pasini) , but differs from that species in having much shorter spines and a microreticulate anteroventral surface. In this latter respect it is similar to E. tumida n.sp., however, that species lacks spines or ridges and the cells of the microreticulation are more ordered.

Distribution. Found only in the Late Pliocene to Pleistocene ofDSDP Site 254 on the Ninetyeast Ridge, eastern Indian Ocean.