Eucochlis umbiliparva n.sp.
PI. l3, figs 4-6
Description. Shell-minute, turbiniform, minutely phaneromphalous. Protoconch of}l;4 smooth whorls with fine growth lines. Teleoconch of 3~ strong convex whorls between deeply impressed sutures, with approximately 42 gently prosocline collabral cords evenly spaced in the last whorl, spiral threads restricted on the base. Aperture simple, almost rectangular, lips slightly thickened, parietal inductura wanting, outer lip nearly straight prosocline or very slightly concave forward.
Types. Holotype (F78448) and 2 figured paratypes (F78449 -50). There are 5 unfigured additional specimens (F78436).
| Dimensions. H Holotype (F78440) 1.3 mm | W - mm | PA 70° | NW 4Y 2 |
|---|---|---|---|
| Paratypes(F78441 a)1.1 (F78441 b)1.1 (F78443)1.2 (F78442)1.0 | 1.0 1.0 1.0 1.0 | 70 68 67 76 | 41,4 4 4 4 |
Type locality. 1.8 km east from the southern end of Glenbawn Dam wall, 13 km north-east of Aberdeen, NSW (Locality 31).
Stratigraphic position. In bioclastic limestone, upper part of the Dangarfield Formation.
Additional material. 1 specimen from 'Marohn' (Locality 28) and 1 from Glenbawn (Locality 29).
Geographic distribution. Glenbawn area.
Geological age. Late Tournaisian.
Etymology. Derived from the Latin umbilicus meaning centre, parvus meaning little, small; referring to a small umbilicus.