Cirripedia

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Cirripedia

[‚sir·ə′pēd·ē·ə]
(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.

Cirripedia

 

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.

REFERENCES

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.

A. V. IVANOV

References in periodicals archive ?
Table A1 Pairwise comparison analysis in analysis of similarity and R-statistics for antennular features in cyprids from the nine investigated species of cirripedes Species pairwise comparison P-value R-statistics Balanus crenatus vs.
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.
What is called the barnacle horizon is the mid-intertidal horizon dominated by these cirripedes (acorn barnacles).
Darwin's efforts to develop a criterion for establishing whether progress has occurred were strongly conditioned by his efforts to classify the cirripedes.
Darwin dealt with the more "primitive" (pedunculated) cirripedes before he went on to the more "advanced" (sessile) ones.
The stalked barnacle Pollicipes pollicipes (Gmelin, 1789), is a strictly littoral and essentially intertidal pedunculate cirripede that lives by forming dense aggregates or clumps on exposed rocky shores and cliffs associated with a high degree of hydrodynamism (Barnes 1996).
Growth, fecundity, and reproductive biology in the pedunculate cirripede Pollicipes polymerus at San Juan Island, Washington.
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).
Since a detailed phylogeny is now available for all cirripedes, such an approach could yield important insights, as was recently the case for an analysis of the evolution of cirripede sexual systems (Lin et al.
TEM studies on the lattice organs of cirripede cypris larvae (Crustacea, Thecostraca, Cirripedia).