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 ?
Seasonal changes in a population of Sacculina carcini Thompson (Crustacea: Rhizocephala) in Scotland.
Crustacea rhizocephala. Norwegian University Press, Oslo, Norway.
Growth, reproduction and life span in Sacculina carcini Thompson (Crustacea: Rhizocephala) in the Isefjord, Denmark.
Systematically, they cover the acorn barnacles (Thoracica Balanomorpha), the asymmetric barnacles (Verrucomorpha), the paraphyletic assemblage of stalked barnacles (Thoracica Pedunculata), and the parasitic Rhizocephala.
Finally, we included the parasitic barnacle Peltogaster paguri (Rhizocephala), which infests hermit crabs.
The life history of Lernaediscus porcellanae (Cirripedia: Rhizocephala) and co-evolution with its porcellanid host.
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).
A new motile, multicellular stage involved in host invasion by parasitic barnacles (Rhizocephala).
Revision of the Rhizocephala Akentrogonida (Cirripedia), with a list of all the species and a key to the identification of families.
spiculifer hemoglobin is similar to that found in Rhizocephala, although the native mass is 5 to 20 times smaller.
Morphology of Thompsonia reinhardi, new species (Cirripedia: Rhizocephala), parasitic on the northeast Pacific hermit crab Discorsopagurus schmitti (Stevens).
A study of the morphology and biology of Thompsonia littoralis (Crustacea: Cirripedia: Rhizocephala).