a small , especially one of the foremost pair of a crustacean.
Historical Examples

If it is in its natural position, it is not an antennule, but the endopodite of the second or third pair of cephalic appendages.
The Appendages, Anatomy, and Relationships of Trilobites Percy Edward Raymond

Make a drawing of the surface of part of an eye; also of an antennule; and of an antenna.
Elementary Zoology, Second Edition Vernon L. Kellogg

one of a pair of small mobile appendages on the heads of crustaceans in front of the antennae, usually having a sensory function


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