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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 ?
This introduces the question of whether structural diversity of the cypris antennule is correlated with the diversity of habitats and substrata used in settlement by cirripede species.
2B and 2E) was divided into two segmented parts: proximal part which had no orna-mentation in the form of scales but the basal podomere (plate) bears a large posterior spine, the second bears a pair of anterior spine with rounded tips, the third bears a pair of median spine, and the last podomere terminates in a hook; proximal part stout, first segment slightly curved, bearing large triangular posterior and anterior spines with rounded tips; second segment with hook-shaped spines bending toward abdomen, slender distal part of antennule bearing anterior blunt knob, extending slightly beyond terminal spine, second segment of distal part half as long as first; terminal segment bearing about five to seven stout apical setae.
A) Habitus, dorsal; B) Abdomen and caudal rami, dorsal; C) Right caudal ramus, dorsal; D) Right antennule (arrowheads indicate naked setae on proximal segment), ventral.
These accumulated chemical compounds might cue the shrimp antennule flicking, affecting their aesthetascs sensorial capability (Koehl 2006, 2011) and thus the detection of food attractants (de la Haye et al.
Antennule (Figure 2A) 8-segmented; armature formula: 1(1), 2(9), 3(7), 4(2+ (1+ae)), 5(2), 6(3), 7(4), 8(5+acrotek).
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.
dubia in characters related to antennule length compared to body length, but mainly to the shape and relative size of the genital double somite and other urosomal somites.
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.
Sensory papilla of antennule with nine aesthetascs, one of them larger, seven more subequal and one smaller.
Each antennule sports thousands of hairlike odor sensors, which give the lobster an extraordinarily sensitive sense of smell by which to navigate.
Eight characters (body length, body width, eye diameter, rostrum width, length of flagellum on antennule, length of flagellum on antenna, length of last peduncular article on antenna, and length of uropodal exopod) were measured on an approximately equal number of males and females in each of the two sampled years; sample sizes ranged from 10 to 34 per beach (Lessios et al.