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see gastropodgastropod,
member of the class Gastropoda, the largest and most successful class of mollusks (phylum Mollusca), containing over 35,000 living species and 15,000 fossil forms.
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References in periodicals archive ?
A demand has sprung up, principally in Japan (for the manufacture of buttons) for the trochus shell (a univalve spiral shell), which is to be found in considerable quantities on the reefs that spread everywhere in these waters.
Pierburg regards the valve control system developed by Mechadyne and already partially produced under license as an ideal completion of its UniValve technology with applications for small-and medium-sized vehicles as well as the truck segment.
Kleinert says that the system can provide as much as a 10% overall fuel efficiency improvement, and that when the 2020 European CO, regulation of 95 g/km, systems like UniValve "will be 100% on engines.
Take the "left-handed whelk shell", more correctly termed the reverse univalve shell, for example.