Campbellospira conica, 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 : 77

Campbellospira conica n.sp.

PI. 5 figs 4-7

Description. Very small, conically spired turbiniform shell of 5l1z whorls, phaneromphalous. Protoconch simple, with 2 whorls with faint growth lines and with distinct varix. Teleoconch with conical spire subtending an angle of 85-90°, 3l1z whorls with sutures incised; ornamentation of strong collabral cords and faint spiral threads, with approximately 30 collabral cords in the final whorl; cords orthocline above selenizone and shallow sinus below selenizone extending to base. Selenizone moderately wide, bordered by spiral ridges high on the whorl, slightly concave, ornamented with fine spiral threads. Aperture with thickened arcuate inner lip; outer lip with a broad, shallow sinus culminating in a broad, seemingly shallow slit above the periphery.

Dimensions. H Holotype ( F78382 ) 4.3 mm	W 4.2 mm	PA 90°	NW 5l1z
Paratypes ( F78384 )3.8 ( F78383 )3.6	3.5 TODO	88 90	5l1z 5

Dimensions. Figured specimens	H	W	PA
( F78388 ) ( F78389 )	3.0 mm 3.1	3.1 mm 3.5	117° 120

Type. Holotype ( F78382 ) and 2 figured paratypes ( F78383 -4). There are 65 unfigured additional specimens ( F78378 ) from the type locality.

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

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

Additional material. 1 specimen from south-east of 'Rangari' (Locality 18).

Geographic distribution. 'Rangari' to Swains Gully.

Geological age. Middle Tournaisian.

Etymology. Referring to the conical shell shape.

Remarks. Campbellospira conica n.sp. differs from other species of Campbellospira in many respects: Campbellospira sp. A has a low spire with convex whorl profile, more closely spaced collabral cords above the selenizone and a smooth surface except for growth lines below selenizone. Campbellospira sp. B has a relatively high spire with canaliculate profile, and prominent spiral cords below the selenizone; Campbellospira sp. C is a low-spired biconvex lenticular form with a larger pleural angle (117°).