Austrotoma ampla is an extinct species of sea snail, a marine gastropod mollusk in the family Pseudotomidae.
Description The holotype has an actual shell length of 68.5 mm, (estimated) 84 mm; its diameter 30 mm. (source-attribution}}
Distribution Fossils have been found in Lower Pliocene strata at Marlborough, New Zealand.
References
Maxwell, P. A. (2009). Cenozoic Mollusca. Pp 232-254 in Gordon, D. P. (ed.) New Zealand inventory of biodiversity. Volume one. Kingdom Animalia: Radiata, Lophotrochozoa, Deuterostomia. Canterbury University Press, Christchurch.