Eucytherura polydictyota, 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 : 217

? Eucytherura polydictyota n.sp.

Fig. 2 H-N

Etymology. Greek, many plus net. Referring to the varied reticulation on the valve external surface.

Type material and dimensions. Holotype, AMF 91146, adult right valve, length 0.25 mm, height 0.14 mm . Paratype: AMF 91145, adult right valve, length 0.25 mm, height 0.14 mm, from core Z2108 /3, level 65 cm, Late Pleistocene ; AMF 91147, adult left valve, length 0.24 mm, height 0.13 mm, 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, level 41 cm. Late Pleistocene.

Diagnosis. An alate species of? Eucytherura with strong ventro-lateral ridge, and median ridge which joins dorsal ridge in a posterior loop. Murae thickened over position of adductor muscle scars. Surface reticulate: fossae large centrally grading to dense secondary reticulation distally. Median hinge element slightly flexured. Normal pores well distributed with one conspicuously positioned between the anterior ends of the median adductor scars.

Description. Very small, subrectangular to subtriangular in lateral view. Anterior margin convex with apex below mid-height. Posterior margin convex and very narrow with extremity at mid-height. Dorsal margin straight to slightly undulating, with small anterior hinge ear. Ventral margin biconvex about median oral incurvature. Moderately well inflated ventrally forming a blunt alar process which bears a distinct ridge anteriorly. Adductor muscle scar region distinct externally as a low hemispherical swelling just anteroventral of valve centre. A second conspicuous ridge extends across central field tapering at each end, looping backwards posterodorsally. Remainder of lateral surface covered with reticulation. Fossae large centrally and mid dorsally, are secondarily subdivided and elsewhere. Primary murae diminish in strength away from valve mid-length, becoming almost equal with fine secondary murae over distal compressed regions and over ventral surface. Normal pores well distributed with one inserted between the anterior ends of the median adductor scars. 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 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.