Tentacle
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In zoology, a tentacle is a flexible, mobile, and elongated organ present in some species of animals, most of them invertebrates. In animal anatomy, tentacles usually occur in one or more pairs. Anato
Front view of land snail showing upper and lower sets of tentacles
Abalone showing pallial tentacles
Deep-sea ctenophore trailing tentacles studded with tentilla
Cirrus (biology)
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In biology, a cirrus is a long, thin structure in an animal similar to a tentacle but generally lacking the tentacle's strength, flexibility, thickness, and sensitivity.
Tentacle
…tentacles are the eyestalks of various kinds of snails. Some kinds of tentacles have both sensory and manipulatory functions. A tentacle is similar to a cirrus, but a cirrus is an organ that usually lacks the tentacle's strength, size, flexibility, or sensitivity. A nautilus has cirri, but a squid has tentacles…
Adult female roughhead blenny with supraorbital cirri