Ruedemannia sp.
PI. 8 figs 9-10, PI. 9 figs 1-4
Description. Shell medium, turbiniform, moderately phaneromphalous with convex crenulated selenizone in the middle of whorl; protoconch seemingly smooth, collabral threads in the nepionic whorls; 1 spiral cord above and 2 below selenizone; collabral cords sharp, regularly spaced; outer lip with a wide shallow sinus culminating at the periphery in a short slit.
Locality. Approximately 250 m west of Babbinboon Lane, in Swains Gully, 15 km south-west of Somerton, NSW (Locality 25) .
Stratigraphic position. 130 m above the base of the Namoi Formation.
Additional material. 4 specimens from the same locality .
Geographic distribution. Above locality only.
| Dimensions. Figured specimens | H | W | PA | NW |
|---|---|---|---|---|
| (F78408) 4.1 mm (F78409 a)2.8 | 3.4 mm 2.1 | 67° 70 | 6Y2 5Y2 | |
Geological age. Middle Tournaisian.
Remarks. Ruedemannia sp. differs from R. bembexiformis Campbell & Engel in having spiral cords on the base and a minute umbilicus.