![]() Up to the early twentieth century "tentacles" were interchangeably called "arms". They take the form of highly mobile muscular hydrostats with various appendages such as suction disks and sometimes thorny hooks. Īmong cephalopods, squid have spectacular tentacles. Some marine snails such as abalone and top snails, Trochidae, have numerous small tentacles around the edge of the mantle. Molluscs have one pair of tentacles close to their mouths that hold close to their captured prey before they can consume it. Both pairs are fully retractable muscular hydrostats, but they are not used for manipulation or prey capture. The most familiar are those of the pulmonate land snails, which usually have two sets of tentacles on the head: when extended the upper pair have eyes at their tips the lower pair are chemoreceptors. Many molluscs have tentacles of one form or another. ![]() See also: Cephalopod limb Front view of land snail showing upper and lower sets of tentacles Abalone showing pallial tentacles ![]()
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