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n. Zoology
A small antenna or similar organ, especially one of the first pair of small antennae on the head of a crustacean.

[French, diminutive of antenne, antenna, from Medieval Latin antenna, sail yard; see antenna.]

an·ten′nu·lar adj.


(Zoology) one of a pair of small mobile appendages on the heads of crustaceans in front of the antennae, usually having a sensory function
[C19: from French, diminutive of antenna]


(ænˈtɛn yul)

a small antenna, esp. one of the foremost pair of a crustacean.
an•ten′nu•lar, an•ten′nu•lar′y, adj.
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References in periodicals archive ?
KEY WORDS: aesthetascs, sensory structures, chemoreception, mechanoreception, antennule, antenna, Macrobrachium rosenbergii, giant river prawn
02 Antennule 2A, 1S Antenna Small spines in protopod 6-7 Maxilliped 1 Coxa (S) nd Telson Outer spines 3 Pleon Dorsolateral processes (P) 2-4 G.
In addition, she classified Farfantepenaeus into two groups according to the shape and position of the rostrum with respect to the segments and flagellum of the antennule and the ratio RL/CL: 1) F.
Each antennule sports thousands of hairlike odor sensors, which give the lobster an extraordinarily sensitive sense of smell by which to navigate.
The sixth stage has a segmented inner flagellum of the antennule and fully developed pleopods with setae.
In the presence of certain amino acids, the neurons of the antennule fire.
Identification of species was based on the morphological characters of rostrum, carapace, branchiae, antennule, antenna, third maxilliped, pereiopods, pleopods, abdomen, telson, petasma, thelycum, and the colored pattern of the whole body based on keys and diagnoses available from the current literature.
Olfactory responses of lobsters (Homarus americanus) to solutions from prey species and to seawater extracts and chemical fractions of fish muscle and effects of antennule ablation.
As a consequence of the fouling of antennules, olfactory setae (responsible for chemically mediated perception of food and mates) can be damaged, possibly leading to the interruption of distance hemoreception (Bauer, 1989).
The sympod on the antennules of adult males was characterized development of soft sensory setae (see both species, after attaining size 6.