Rhizocephala


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Related to Rhizocephala: rhizocephalan

Rhizocephala

[‚rī·zō′sef·ə·lə]
(invertebrate zoology)
An order of crustaceans which parasitize other crustaceans; adults have a thin-walled sac enclosing the visceral mass and show no trace of segmentation, appendages, or sense organs.

Rhizocephala

 

a suborder of crustaceans of the order Cirripedia. They are internal parasites of crabs, hermit crabs, and shrimp. Their structure is extremely simple. The saclike unsegmented body is filled with ova and genital organs and is attached to the abdomen of the host by means of a thin stem with ramified appendages that pierce the host’s body. Limbs and an alimentary canal are absent. Rhizocephala are classified as crustaceans because they have free-swimming larvae, the nauplius and cypris. The infestation of new hosts is done by the larvae. Members of the suborder live primarily in the sea. Some Rhizocephala are hermaphrodites; others produce dwarfed males. A typical representative of the suborder is Sacculina.

References in periodicals archive ?
crustaceans, marine sponges, corals, turtles, whales), and highly advanced parasites such as the Rhizocephala that infest Crustacea (Anderson, 1994; Hoeg and M0ller, 2006).
Systematically, they cover the acorn barnacles (Thoracica Balanomorpha), the asymmetric barnacles (Verrucomorpha), the paraphyletic assemblage of stalked barnacles (Thoracica Pedunculata), and the parasitic Rhizocephala.
The biology and life-cycle of the Rhizocephala (Cir-ripedea).
The situation wherein several conspecific UOSs combine to form a morphologically new structure is best represented by certain primitive crustaceans (order Rhizocephala in the subclass Cirripedia, the barnacles).
spiculifer hemoglobin is similar to that found in Rhizocephala, although the native mass is 5 to 20 times smaller.