Eucytherura boomeri, 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 : 211

? Eucytherura boomeri n.sp.

Fig. 2 A-D

Etymology. For Dr lan Boomer in recognition of his innovative work on deep-sea Ostracoda.

Type material and dimensions. Holotype, AMF 91141, adult left valve, length 0.25 mm, height 0.12 mm. Paratype: AMF 91142, adult right valve, length 0.24 mm, height 0.13 mm. Both specimens are from the type locality and horizon .

Type locality and horizon. Western flank of Lord Howe Rise, present day water depth 1340 m, Sonne core 36- 61, interval 12-13 cm, Late Pleistocene.

Diagnosis.? Eucytherura with convex dorsal margin, low longitudinal ridges and intercostal reticulation in posterior half. Reticulation grades to dense punctation distally. Weakly alate posteroventrally. Median hinge element smuous.

Description. Very small, subovate in lateral and dorsal view, shell moderately well calcified. Anterior margin convex; posterior margin short and convex. Dorsal margin convex, weakly undulating; ventral margin gently biconvex. Weakly inflated, slightly longitudinally swollen posteroventrally. Diffuse longitudinal ridges through posterior half with intercostal reticulation bounding well rounded fossae and secondarily reticulate, grading to fine, dense punctation distally. Adductor muscle scars large, four in a subvertical row anteroventral of valve centre, frontal scar subreniform, just ahead or dorsomedian adductor scar; normal pores, simple and well distributed, internally emergent at base of large pits. Antimerodont hinge: finely crenulate, flexured median element; in RV, terminal elements finely denticulate, narrow and elongate, tapering under ends of median element. Inner lamella moderately broad anteriorly, with small crescentic vestibulum, narrow ventrally with narrow vestibulum. Few radial pore canals, 4 -5 true anteriorly, 3 posteroventrally.

Comparisons. The species can be distinguished from? E. polydictyota n.sp. by its more curved dorsal margin, less distinct ridges and reticulation, and lack of an alar ridge. It is placed only tentatively within Eucytherura due to its lack of normal pore clusters.

Distribution. Found only in the Late Quaternary of the type locality.