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Antennule

First cephalic appendage, usually with peduncle of three articles and two multiarticulate flagella (sometimes antenna 1). [Poore, 2004]
First pair of cephalic appendages (antenna 1). [Holdich and Jones, 1983]
First pair of feelers, or antennae. [Bliss, 1982]
Inner of two paired flagelate appendages projecting from anterior end of body. [Butler, T. H.]
More mesial of the two paired, usually flagellate appendages projecting from the anterior end of the cephalothorax (Fig. 1, 3B). [Perez Farfante and Kensley, 1997]
One of a pair of appendages of the first cephalic somite.
(syn. 1st antenna) [McLaughlin, 1980]
One of pair of appendages of the first cephalic somite; "first antenna" (Figs. 13, 14). [Hobbs and Jass, 1988]
One pair of morphologically frontmost appendages of head region, usually filiform and multiarticulate, uniramous except in Malacostraca where it is generally biramous or even triramous; may be larger or smaller than morphologically next following appendages named antennae.
(syn. antennula, first antenna) [Moore and McCormick, 1969]
The first pair of antennae. [Brusca and Brusca, 2002]
The first pair of appendages situated medially close together under the frontal region. [Ingle, 1983]
The more mesial of the two paired flagellate appendages projecting from the anterior end of the body. [Chace and Hobbs, 1969]
(Taxon-specific: Order Cladocera) First and typically much smaller pair of antennae; located ventrally near posterior margin of head. Uniramous, unsegmented, with tuft of terminal aesthetascs. (movable, immovable = fixed; fused/ not fused with rostrum; insterted/ not inserted at anterior end of ventral edge of head).
(syn. first antenna) [Stachowitsch, 1992]
(Taxon-specific: Order Notostraca) First and larger pair of antennae; relatively short, uniramous and slender. Extends from each side of labrum anterior to antennae. (simple, obscurely segmented).
(syn. first antenna) [Stachowitsch, 1992]
(Taxon-specific: Order Diplostraca) First and much smaller pair of antennae; uniramous, typically with series of dorsal sensory papillae. (short, long; unsegmented = unjointed, with two segments, multijointed).
(syn. first antenna) [Stachowitsch, 1992]
(Taxon-specific: Order Anostraca) First and smaller of two pairs of antennae, projecting from anterior end of head. Uniramous, either unsegmented or only superficially segmented. (with/without tuft of terminal setae).
(syn. first antenna) [Stachowitsch, 1992]
(Taxon-specific: Class Cephalocarida) First pair of antennae. Uniramous, consisting of six segments; bears terminal aesthetasc. With locmomotory and sensory functions.
(syn. first antenna) [Stachowitsch, 1992]
(Taxon-specific: Order Cumacea) First pair of antennae. Basically biramous, consisting of proximal three-segmented peduncle bearing larger outer (main) and smaller inner (accessory) flagellum. May bear aesthetascs. (uniramous, biramous; geniculate).
(syn. first antenna) [Stachowitsch, 1992]
(Taxon-specific: Order Tanaidacea) First, relatively large pair of antennae. If fully developed, biramous, consisting of proximal four-segmented peduncle and two flagella. (uniramous, biramous).
(syn. first antenna) [Stachowitsch, 1992]
(Taxon-specific: Order Decapoda) First and typically smaller pair of antennae. Originates from first (antennular) somite of head, each consisting of basal peduncle and one or more distal flagella. Peduncle bear statocysts and stylocerites, flagella bear aesthetascs. In crab-like (brachyuran) decapod, may be folded into orbitoantennulary pit of carapace. (biramous, triramous).
(syn. first antenna) [Stachowitsch, 1992]
(Taxon-specific: Order Amphipoda) First pair of antennae. Basically biramous, consisting of proximal three-segmented peduncle bearing large outer (primary) and smaller inner (accessory) flagella. (short, long; slender, robust; naked, setose, spinose; geniculate; with/without accessory flagellum = biramous/uniramous).
(syn. first antenna) [Stachowitsch, 1992]
Nomenclature of isopod cephalon (A). Examples of isopod mouth appendages: Idoteidae (B, C, F, H); Cirolanidae (D, E, G, I). [Wetzer et al. 1997]
(Taxon-specific: Order Isopoda) Antennae 1 or first antennae; anteriormost paired appendages of head (= antennula). [Wetzer et al. 1997]
(Taxon-specific: Order Isopoda) First, usually shorter appendage of cephalon; typically uniramous,
consisting of basal peduncle and distal flagellum. (uniramous, biramous).
(syn. first antenna) [Stachowitsch, 1992]
Schematic representation of an isopod illustrating morphological terms. [Kensley and Schotte, 1989]
(Taxon-specific: Order Isopoda) Paired appendage of the second cephalon segment; sometimes referred to as antenna 1. [Kensley and Schotte, 1989]
(Taxon-specific: Order Mysida) First pair of antennae. Biramous, consisting of three-segmented peduncle and pair of flagella. Antennule of male may bear processes masculinus and, rarely, an additional unsegmented accessory process.
(syn. first antenna) [Stachowitsch, 1992]
(Taxon-specific: Order Stomatopoda) First and larger pair of antennae; originating from first (antennular) somite of head. Consists of slender, three-segmented peduncle and three short flagella.
(syn. first antenna) [Stachowitsch, 1992]
(Taxon-specific: Order Leptostraca) First pair of antennae. Relatively long, basically biramous, typically consisting of four-segmented peduncle with flagelliform inner branch (endopod) and scale-like outer branch (exopod). (biramous, uniramous; fourth segment of peduncle: with/without process, with tuft of bristles). [Stachowitsch, 1992]
(Taxon-specific: Subclass Branchiura) First pair of appendages on underside of head. Relatively short and basically four-segmented. Bears palp and several large spines/hooks; anterior antennular spine/hook is associated with gland or sensory organ. Serves in attachment to host.
(syn. first antenna) [Stachowitsch, 1992]
(Taxon-specific: Subclass Cirripedia) First pair of antennae. Present in larval (nauplius, cyprid) stages, yet typically reduced or absent in adults. Used in attachment by barnacle larvae and associated with cement glands. Well developed in adult acrothoracican and ascothoracican. (prehensile, raptorial, subchelate, uniramous).
(syn. first antenna) [Stachowitsch, 1992]
(Taxon-specific: Subclass Copepoda) First and typically larger pair of antennae on underside of head. Uniramous, consisting of up to 26 articles. In male, one or both may be equipped with hinge joint for grasping female during copulation. Bears aesthetascs. Number of articles is of systematic importance. The term first antenna is often preferentially applied. (geniculate).
(syn. first antenna) [Stachowitsch, 1992]
(Taxon-specific: Subclass Copepoda) The anterior limb of the cephalon; it is uniramous in copepods.
(syn. antenna 1) [Ferrari and Dahms, in press]
(Taxon-specific: Subclass Copepoda) The first cephalic appendage. [Boxshall and Halsey, 2004]
(Taxon-specific: Subclass Mystacocarida) First and larger pair of antennae. Uniramous, consisting of eight setose segments and occasionally bearing terminal aesthetasc.
(syn. first antenna) [Stachowitsch, 1992]
(Taxon-specific: Class Ostracoda) First pair of antennae on head. Uniramous, typically consisting of five to eight segments. Bears setae and claws for swimming, digging, and copulation; bears one or more aesthetascs. Carpace margin may be indented (rostral notch) for antennules.
(syn. first antenna) [Stachowitsch, 1992]
(Taxon-specific: Class Remipedia) First and larger pair of antennae on underside of head (cephalon); biramous and consisting of basal peduncle (with two articles and bearing aesthetasc pad) and distal (dorsal and ventral) flagella. Setae on antennae are simple.
(syn. first antenna) [Stachowitsch, 1992]
(Taxon-specific: Superorder Syncarida) First pair of antennae. Consists of basal peduncle and distal flagellum (or flagella). Biramous, with tiny lappet in bathynellacean interpreted as representing second branch. (with/without statocyst).
(syn. first antenna) [Stachowitsch, 1992]
(Taxon-specific: Order Thermosbaenacea) First, relatively large pair of antennae. Uniramous, consisting of peduncle and flagellum.
(syn. first antenna) [Stachowitsch, 1992]
(Taxon-specific: Order Euphausiacea) First pair of antennae. Biramous, consisting of proximal three-segmented peduncle and two distal flagella. Antennules joined to each other by setae on first peduncular segment. (with/ without antennular lappet).
(syn. first antenna) [Stachowitsch, 1992]