Jardinella thaanumi (Pilsbry, 1900) Diagnostic features This is one of three riverine species found in NE Australia that have similar shell morphology. The very narrow or closed umbilicus and the inner lip which forms a shelf over the umbilical chink are characteristic of this species.This one differs from J. tumorosa in having a narrow bursal duct and from J. tullyensis in Barron River Gorge, a typical habitat of Jardinella Distribution of Jardinella thaanumi. thaanumi. Jardinella thaanumi (adult size 2.7-4 mm) having rounded shoulders. Classification Jardinella thaanumi (Pilsbry, 1900) Class Gastropoda I nfraclass Caenogastropoda Order Littorinida Suborder Rissoidina Superfamily Truncatelloidea Family Tateidae Genus Jardinella redale & Whitley,1938 Original name: Petterdiana thaanumi Pilsbry, 1900. Pilsbry, H. A. (1900). A new NE Australian amnicoloid. The Nautilus 13: 144. Type locality: "near Cairns, Queensland" (Type restricted to Barron River by Ponder (1991). Biology and ecology Found in shaded clear flowing creeks and the main river; rock and gravel beds, typically beneath rocks. Distribution Found in rivers and streams flowing eastward from the Atherton Tablelands (Johnston and Barron Rivers, etc.) in north Queensland, with the exception of the Mulgrave River. Further reading Perez, K. E., Ponder, W. F., Colgan, D. J., Clark, S. A. & Lydeard, C. (2005). Molecular phylogeny and biogeography of Spring-associated hydrobiid snails of the Great Artesian Basin, Australia. Molecular Phylogenetics and Evolution 34: 545-556. Ponder, W. F. & Clark, G. A. (1990). A radiation of hydrobiid snails in threatened artesian springs in western Queensland. Records of the Australian Museum 42: 301-363. To cite this resource: Ponder, W. F., Hallan, A., Shea, M. and Clark, S. A., Richards, K., Klungzinger, M., and Kessner, V. 2020. Australian Freshwater Molluscs. https://keys.lucidcentral.org/keys/v3/freshwater_molluscs/ To contact the authors for comment or suggestions, please email: [email protected] Copyright © 2020. All rights reserved. The Australian Museum. .