Photo of the day (24): Causa holosericea

Causa holosericea (Studer, 1820) is a land snail from the family Helicidae. It has Alpine distribution.

It lives mainly in humid mixed forests and in coniferous forests, but also in decidous forests. It can be usually found under the fallen timber.


There are fine hairs on the periostracum that gives velvety feels to the shell. Some vernacular names are based on these velvety hairs.

The Czech name of Causa holosericea is aksamítka sametová.

Czech etymology:
aksamit = silk velvet,
aksamítka (from dialect from Moravian Wallachia) = velvety ribbon or low fur hat with velvety surface and with edging made of fur from an otter (this fur hat is also called vydrovka in Czech),
sametová = velvety.


The Slovak name of Causa holosericea is aksamietka zamatová.

Slovak etymology:
aksamit = silk velvet,
aksamietka (colloquial expression) = velvety ribbon,
zamatová = velvety.


This post is devoted to the Velvet Revolution, that started on 17th November 1989 at that time in Czechoslovakia.



Falkner G., Obrdlík P., Castella E. & Speight M. C. D. (2001). Shelled Gastropoda of Western Europe. München: Friedrich-Held-Gesellschaft, 267 pp.

(in Czech) Horsák M., Juřičková L., Beran L., Čejka T. & Dvořák L. 2010: Komentovaný seznam měkkýšů zjištěných ve volné přírodě České a Slovenské republiky. [Annotated list of mollusc species recorded outdoors in the Czech and Slovak Republics]. – Malacologica Bohemoslovaca, Suppl. 1: 1-37.

(in Slovak) Lisický M. J. (1991). Mollusca Slovenska [The Slovak molluscs]. VEDA vydavateľstvo Slovenskej akadémie vied, Bratislava, 344 pp., page 322.

(in Slovak) Országh I., Čejka T. & Országhová Z. 2012: Slovenské mená mäkkýšov (Mollusca). [Slovak Names of the Mollusca]. – Univerzita Komenského v Bratislave, 208 pp., ISBN 978-80-223-3170-8.

(in Slovak) “aksamiet” – význam slova., accessed 17 November 2012.

(in Czech) Slovník spisovné valaštiny. accessed 17 November 2012.


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