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(invertebrate zoology)
A subclass of the Crustacea, including the barnacles and goose barnacles; individuals are free-swimming in the larval stages but permanently fixed in the adult stage.



an order of crustaceans. Members of the order are sessile. Some parasitize other animals, mainly decapods.

The body of nonparasitic representatives, for example, members of the superfamilies Balanomorpha and Lepadomorpha, is covered with a mantle that excretes calcareous plates, forming the shell. The height of the shell is 1–40 cm. The body, which is divided into a head, thorax, and abdomen, has antennules on the head that are converted into organs of attachment. There are also oral extremities on the head. The thorax has six pairs of long, segmented cirri, by means of which the crustacean forces water with food particles (tiny organisms) into its mantle cavity.

Most members of the family are hermaphroditic; some have supplementary dwarfed males. The saclike body of parasitic species lacks a shell, extremities, and an intestine. The organism hatches from an egg and develops into a nauplius, which is then transformed into a cypris larva. The Cirripedia live in seas, attaching themselves to solid objects. The Balanomorpha foul the bottoms of seagoing vessels.

The Cirripedia include approximately 700 species. Seas of the USSR, except the Caspian and Aral seas, have approximately 50 species.


Darwin, C. Usonogie raki: Sochineniia, vol. 2. Moscow-Leningrad, 1936.
Zhizn’ zhivotnykh, vol. 2. Moscow, 1968.
Tarasov, N. I., and G. B. Zevina. Usonogie raki (Cirripedia Thoracica) morei SSSR. Moscow-Leningrad, 1957. (Fauna SSSR: Novaia seriia, no. 69.)
Dogel’, V. A. Zoologiia bespozvonochnykh, 6th ed. Moscow, 1975.


References in periodicals archive ?
When similar beginnings lead to different ends: constraints and diversity in cirripede larval development.
Cirripedes have become favored organisms for the study of marine larval settlement because of their range of life forms, their ubiquity as biofoulers, and the structural diversity of juveniles formed by metamorphosis of the settled cyprid.
Cirripedes are primary models in the study of invertebrate larval settlement in general, in part due to their role in the fouling of man-made objects in the sea (Aldred and Clare, 2008, 2009).
What is called the barnacle horizon is the mid-intertidal horizon dominated by these cirripedes (acorn barnacles).
19-20) shows how the cirripedes have undergone "perfection" in some features but not others.
Crustaceans predominated at both intertidal sites; malacostracans were most abundant at I1 (44%), whereas cirripedes were most numerous at I2 (39%).
Egg size, nauplius size, and their variation with local, geographical, and specific factors in some common cirripedes.