Hesperiella elongata n.sp.
PI. 7 figs 5-7
Description. Shell very small, rather high spired, sinistral, anomphalous or hemiomphalous. Protoconch coiling inward and hidden by later whorls, apex a funnellike hole. Teleoconch with whorl profile rather straight; collabral costae widely spaced, opisthocline, with about 40 cords in the final whorl. Selenizone narrow, concave, smooth, adjacent to lower suture, seen only in the final whorl. Aperture subangular.
| Dimensions. H | W | PA | NW |
|---|---|---|---|
| Holotype (F78399) 4.1 mm Paratype (F78400)2.5 | 3.7 mm 2.7 | 50° TODO | 41f2 TODO |
Types. Holotype (F78399) and 3 paratypes (F78400, F78405).
Type locality. 4 km south-east of 'Rangari' homestead, on the Gunnedah-Barraba roadside, 34 km north-east of Gunnedah, NSW (Locality 18).
Stratigraphic position. In bioclastic limestone, the middle limestone lens in the Tulcumba Sandstone.
Additional material. 1 specimen each from north of 'Rangari' (Locality 14), north-east of 'Rangari' (Locality 15) and Glenbawn (Locality 29).
Geographic distribution. 'Rangari' to Glenbawn.
Geological age. Middle to late Tournaisian.
Etymology. Derived from the Latin elongatus meaning elongate, referring to the tall spire of shell.
Remarks. This species is characterised by a tall-spired shell with a rather flat whorl profile, which is very different from any other HesperieUa species.