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antenna

The appendage of the third cephalon somite, consisting of a five-segmented peduncle and a flagellum. Through fusion of the segments with the body or with each other, the peduncle may seem to consist of fewer segments. The flagellum is usually multi-articulated, it may be supple or very stiff; in the Scyllaridae the flagellum is transformed into a single plate-like segment, similar to the peduncular segments. The antenna sometimes is named "second antenna", and the antennula, "first antenna". Both, the antenna and the antennula are tactile organs (feelers).

Alternatives:
antennae

Multimedia:
Body and appendages
Antennular somite dorsal view
Carapace and appendages
Chephalothorax dorsal view 1
Chephalothorax ventral view
Chephalothorax dorsal view 2