Barnacle
（重定向自Cirriped）
![](/Images/godic/202501/04/Chthamalus_stellatus5207.jpg")
![Barnacles attached to the ventral pleats of a humpback whale calf](/Images/godic/202501/04/Anim1032_-_Flickr_-_NOAA_Photo_Library5207.jpg")
![Nauplius larva of Elminius modestus](/Images/godic/202501/04/Elminius_modestus_nauplius5207.jpg")
![Nauplius larva of a barnacle with fronto-lateral horns[6]](/Images/godic/202501/04/Cirripedia_nauplius5207.png")
A barnacle is a type of arthropod constituting the infraclass Cirripedia in the subphylum Crustacea, and is hence related to crabs and lobsters. Barnacles are exclusively marine, and tend to live in shallow and tidal waters, typically in erosive settings. They are sessile (nonmotile) suspension feeders, and have two nektonic (active swimming) larval stages. Around 1,220 barnacle species are currently known. The name "Cirripedia" is Latin, meaning "curl-footed".