Cymblllaria carinata, Yoo, 1994

Yoo, E. K., 1994, Early Carboniferous Gastropoda from the Tamworth Belt, New South Wales, Australia, Records of the Australian Museum 46 (1), pp. 63-120 : 71

Cymblllaria carinata n.sp.

Dimensions.	MD	TS
Holotype ( F78348 )	1.2mm	1.2mm
Paratypes ( F78349 a)	1.2	1.4
( F78349 b)	1.5	TODO

PI. 1 fig. 4

Description. Shell very small with rather thick, biconvex lenticular form, isostrophic and smooth with an acute keel at periphery; umbilici closed on both sides by last whorl. Aperture with a deep angular sinus culminating at the periphery in a long narrow slit; lips thick.

Dimensions. Holotype ( F78343 ) MD 2.3 mm, TS 1.8 mm

Types. Holotype ( F78343 ) and 10 paratypes ( F78530 ).

Type locality. About 250 m west of Babbinboon Lane, in Swains Gully, 15 km south-west of Somerton, NSW (Locality 25).

Stratigrapbic position. In bioclastic limestone, 130 m above the base of the Namoi Formation.

Additional material. 3 specimens from 'Marohn' (Locality 28).

Geograpbic distribution. From Swains Gully to 'Marohn'.

Geological age. Middle to late Tournaisian.

Etymology. Derived from the Latin carina meaning carinate; referring to the spiral ridge at the periphery.

Remarks. This is a relatively rare species, and is characterised by a smooth biconvex shell with a long slit and peripheral keel. The specimens are similar to the type species Cymbularia galeata Koken in having a smooth convolute spire with a long narrow slit, but differs in that C. galeata has an asymmetrical adult shell and in lacking a keel on the periphery.