... the sutures, and there may or may not be a whitish band round the columella. ... from mucus which enables it to float the on sea surface, usually apex-down.
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Juveniles (< 30 mm): Shell slightly elongated, lightweight, depressed, flat, not ... moderately exposed rocky shores from intertidal waters down to about -30m ...
... this species is the truncated apex since, growing up, the first spiral whorls fall down. ... The premature forms, which have not yet lost the upper whorls, are more ... CZ Pfleger V. (1999): České názvy živočichů III. Měkkýši (Mollusca), Národní ...
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... size down the columellar edge of the anterior canal, but are narrow and faint (not secreted as fully as in some examples of this species) over the parietal area.
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