Patency of apertural barriers in clausiliids with different reproductive strategies

Anna Sulikowska-Drozd, e-mail:

Department of Invertebrate Zoology and Hydrobiology, Faculty of Biology and Environmental Protection, University of Łódź, Łódź, Poland

Michał Walczak, e-mail:

X-ray Microtomography Lab, Department of Biomedical Computer Systems, University of Silesia, Chorzów, Poland

Marcin Binkowski, e-mail:

X-ray Microtomography Lab, Department of Biomedical Computer Systems, University of Silesia, Chorzów, Poland

We adopted X-ray microtomography images and the specially designed algorithm that mimics the movement of spherical object in the shell channel to compare apertural barriers of two closely related clausiliid species with well documented reproductive strategies. For oviparous Laciniaria plicata, the patency of the shell channel was 0.60 mm (SD 0.09) at the ultimate whorl; 18.0% in relation to shell width. For viviparous Alinda biplicata, the patency of the shell channel was 1.24 mm (SD 0.06) at the ultimate whorl; 31.8% in relation to shell width. In the studied species, the patency of the shell channel differs significantly at the ultimate whorl, while at the penultimate whorl it is in both cases close to 43%. The technique applied in this study can be useful for analysing apertural patency in any gastropod species that develops a complex protective shell armature.

Key words
shell armature; Gastropoda; land snails; viviparity; X-ray microcomputed tomography

Maltz T. K., Sulikowska-Drozd A. 2008. Life cycles of clausiliids of Poland – knowns and unknowns. Annales Zoologici 58: 857–880.
Maltz T. K., Sulikowska-Drozd A. 2012. Life history of Alinda biplicata (Montagu, 1803) (Gastropoda: Pulmonata: Clausiliidae) based on five-year laboratory observations. Annales Zoologici 62: 789–807.
Moorsel C. H. M. von, Dijkstra E. G. M., Gittenberger E. 2000. Molecular evidence for repetitive parallel evolution of shell structure in Clausiliidae (Gastropoda, Pulmonata). Molecular Phylogenetics and Evolution 17: 200–208.
Nordsieck H. 2007. Worldwide door snails (Clausiliidae), recent and fossil. ConchBooks, Hackenheim.
Nordsieck H. 2008. Alinda biplicata (Montagu) and Laciniaria plicata (Draparnaud), diversity in comparison, with the description of new subspecies. (Gastropoda: Stylommatophora: Clausiliidae). Archiv für Molluskenkunde 137: 133–157.
Ruxton G. D. 2006. The unequal variance t-test is an underused alternative to Student’s test and the Mann-Whitney U test. Behavioral Ecology 17: 688–690.
Pokryszko B. M. 1997. Land snail apertural barriers – adaptation or hindrance? (Gastropoda: Pulmonata). Malakologische Abhandlungen des Staatlichen Museums für Tierkunde Dresden 18: 239–248.
Sulikowska-Drozd A., Walczak M., Binkowski M. 2014. Evolution of shell apertural barriers in viviparous land snails (Gastropoda: Pulmonata: Clausiliidae). Canadian Journal of Zoology 92: 205–213.
Walczak M., Binkowski M., Sulikowska-Drozd A., Wróbel Z. 2015. Maximum sphere method for shell patency measurements in viviparous land snails based on X-ray microcomputed tomography imaging. Computers in Biology and Medicine 64: 187–196.

Folia Malacologica (2018) 26: 149-153
First published on-line: 2018-09-29 00:00:00
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