Meerdere mondopeningen bij landslakken, polystomie of polystomatisme?
Correspondentieblad NMV , Volume 304 - Issue 1 p. 105- 106
The occurrence of a ”double” aperture in a gastropod shell found by Kronenberg (1998) is not new to science. Taylor described this phenomenon in 1894 and invented a name for it: ”polystomatism” (although to me ”polystomy” is a preferable term). It is probably caused by shell damage of the outerwall of the bodywhorl. Butot (1976) mentions two possible kinds of damage as causes: A hole in the outer wall, through which the snail forms a new aperture, or obstruction of the aperture e.g. if the epiphragm could only be partly removed after the winter, necessitating Helix pomatias to form a second aperture within the old one. Partial obstruction of the aperture most probably caused polystomy in Kronenberg’s Fruticola fruticum.
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G.C. Cadée. (1998). Meerdere mondopeningen bij landslakken, polystomie of polystomatisme?. Correspondentieblad NMV, 304(1), 105–106.
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