Donaldina minutissima, 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 : 93

Donaldina minutissima n.sp.

PI. 21 figs 1-6

Donaldina sp. Yoo, 1988: 238 (table 2), figs 110-111.

Description. Shell minute, slender, high-spired turriculate anomphalous. Protoconch of ll1z smooth whorls with deviated spire, the transition from protoconch to teleoconch indistinct orthocline. Teleoconch of about 8 convex whorls with early whorls smooth and later whorls ornamented with 6 evenly spaced spiral cords; whorl profile more or less symmetrically rounded; suture deep, well impressed. Aperture oval, columellar lip slightly arcuate; base rounded.

Dimensions. Holotype ( F78517 )	H 1.7 mm	W 0.6 mm	NW 7l1z
Paratypes(F7851Oa) 1.7 ( F78518 ) 2.6 (F7851Ob)1.1		004 0.6 004	7V! 101,4 51,4

Types. Holotype ( F78517 ) and 3 figured paratypes (F7851O, 78518).

Type locality. 150 m west of 'Marohn' homestead, on the Scone-Gundy roadside, 4 km south-west of Gundy, NSW (Locality 28).

Stratigraphic position. In bioclastic limestone, upper part of the Dangarfield Formation.

Geographic distribution. Type locality only.

Geological age. Late Tournaisian.

Etymology. Derived from the Latin minutissima meaning extremely small.

Remarks. Six specimens recovered for this study are sufficiently well preserved to justify basing a new species. This new species resembles Donaldina filosa Yoo and Pseudoaclisina microspirulata n.sp. in having a minute, slender and tall shell with fine spiral ornament, but it differs in having a more highly deviated protoconch.