Naticopsis (Naticopsis) osbornei Yoo

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 : 82-83

Naticopsis (Naticopsis) osbornei Yoo

PI. 14 Figs 1-8

Naticopsis (Naticopsis) osbornei Yoo, 1988: 244 , figs 65-66.

Additional material. 8 specimens from 'Marohn' (Locality 28) and 1 specimen from G1enbawn (Locality 30).

Geographic distribution. 'Rangari' to Glenbawn.

Geological age. Middle to late Tournaisian.

Remarks. Fifty specimens recovered between 'Rangari' and Glenbawn show a considerable variability in shell shape, ornamentation and callus rugae. Some forms are elongate while others seem distorted. The shape and size of callus are also variable. Specimens are usually ornamented by collabral striae which are more distinct in the last whorl. Plate 14 figure 6 shows stronger striae developed just below the suture of the last whorl.

Figures

Plate 14. Figs 1-8. Naticopsis (Naticopsis) osbornei Yoo. 1. Apertural view 2.8 mm x 2.4 mm (F78457a). 2. Apertural view 3.4 mm x 3.3 mm (F78460). 3. Apertural view 2.1 mm x 2.3 mm (F78457b). 4. Apertural view 3.9 mm x 3.5 mm (F78458). 5. Apertural view 4.5 mm x 3.6 mm (F78459a). 6. Side view, height 4.6 mm (F78459c). 7. Apertural view 6.0 mm x 5.6 mm (F78459b). 8. Apertural view 1.8 mm x 2.0 mm (F78456). Locality 25 except Fig. 8 (Locality 28). Figs 9-12. Naticopsis (Naticopsis) minuta n.sp. 9. Holotype, apertural view 1.1 mm x 1.1 mm (F78463). 10. Paratype, apertural view 1.2 mm x 1.1 mm (F78464). 11. Protoconch of Fig. 9. 12. Teleoconch ornamentation of Fig. 9. Locality 24. Bar scale 0.1 mm.

Fig. 1. Distribution of Carboniferous outcrop and examined localities,

Fig. 2. Stratigraphic nomenclature.

Fig. 3. Occurrences of Early Carboniferous gastropods from the Tamworth Belt.

Fig. 4 Stratigraphic correlations of gastropod localities and comparison with brachiopod and conodont zones.

Plate 1. Figs 1-3. Euphemites pustula n.sp. 1. Paratypes, left lateral view, maximum diameter 3.4 mm (F78342). 2. Holotype, left lateral view, maximum diameter 4.6 mm (F78341). 3. Paratype, apertural view, maximum diameter 4.2 mm (F78342). Locality 25. Fig. 4. Cybularia carinata n.sp. Holotype, apertural view, maximum diameter 2.3 mm (F78343). Locality 25. Figs 5-8. Bellerophon (Bellerophon) swainsensis n.sp. 5. Paratype, anterior dorsal view 6.0 mm x 6.4 mm (F78345). 6. Paratype, apertural view 5.3 mm x 5.6 mm (F78346a). 7. Holotype, apertural view 5.7 mm x 5.4 mm (F78344). 8. Paratype, left lateral view 4.0 mm x 6.4 mm (F78346b). Locality 25. Figs 9-12. Bellerophon (Bellerophon) kyndalynensis n.sp. 9. Holotype, anterior dorsal view 1.2 mm x 1.2 mm (F78348). 10. Paratype, right lateral view, largest diameter, 1.5 mm (F78349b). 11. Paratype, apertural view 1.2 mm x 1.4 mm (F78349a). 12. Se1enizone of Fig. 9. Locality 24. Bar scale 0.1 mm.