Girtyspira inflata n.sp.
PI. 19 figs 9-11
Description. Shell very small, thick, canaliculate fusiform, anomphalous. Protoconch of smooth, simple. Teleoconch of 4Y:z smooth whorls, whorl profile very gently arched; but with a narrow flattened shoulder, close to upper suture; angular, shallow suture formed between shoulder and whorl; base considerably extended. Aperture elongate, anteriorly extended with siphonal notch, columellar lip arcuate; adapical channel of aperture angled.
| Dimensions. H | W | PA | NW |
|---|---|---|---|
| Holotype (F78495) 1.9 mm Paratypes (F78496 a)1.7 (F78496 b)2.0 (F78497)1.5 | 1.5 mm 1.3 1.6 1.1 | 94° 79 TODO 85 | 4Y:z 4 TODO 4 |
| Dimensions. | H | W | NW |
|---|---|---|---|
| Holotype (F78515) Paratype (F78516) | 2.2 mm 2.6 | 1.3 mm 1.4 | 6 4Y:z |
Types. Holotype (F78515) and 1 figured paratype (F78516).
Type locality. 'Lorrina' homestead, 8 km south-west Somerton, NSW (Locality 23).
Stratigraphic position. In bioclastic limestone, upper part of the Namoi Formation.
Additional material. 2 more specimens from lhe type locality and 3 unfigured specimens from Swains Gully, 15 km south-west of Somerton, NSW (Locality 25).
Geographic distribution. Swains Gully area.
Geological age. Middle to late Tournaisian.
Etymology. Derived from the Latin inflatus meaning swollen.
Remarks. This is only species so far referred to Girtyspira in Australia. Girtyspira inflata n.sp. has more canaliculate whorl shoulders and more inflated last whorl than the type species Girtyspira canaliculata (Hall) .