• Webster's Revised Unabridged Dictionary
    • n. pl Rhizocephala (Zoöl) A division of Pectostraca including saclike parasites of Crustacea. They adhere by rootlike extensions of the head. See Illusration in Appendix.
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Century Dictionary and Cyclopedia
    • rhizocephala A group of small parasitic crustaceans, having a cylindroid, sac-like, or disciform unsegmented body, without organs of sense, intestine, limbs, or cement-organs, but with an oral and an anal opening, and the sexual organs well developed. The species are hermaphroditic, and the young go through a nauplius stage and a cypris stage. The Rhizocephala are by some made an order of a subclass Cirripedia; others class them with Cirripedia as a division, Pectostraca, of Entomostraca; by others again they are referred to the Epizoa (Ichthyophthiria or fish-lice). These parasites attach themselves by their modified antennæ, resembling a number of root-like processes, which bury themselves in the substance of the host, whence the name. They are represented by two principal genera, Sacculina and Peltogaster, each made by some the type of a family. They are parasites of crabs. Also called Centrogonida.
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Chambers's Twentieth Century Dictionary
    • n Rhizocephala rī-zō-sef′a-la a group of small parasitic crustaceans
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Webster's Revised Unabridged Dictionary
NL., fr. Gr. root + head
Chambers's Twentieth Century Dictionary
Gr. rhiza, root, kephalē, head.


In literature:

I had almost forgotten your discussion on the retrograde development of the Rhizocephala.
"More Letters of Charles Darwin" by Charles Darwin
Rhizocephala, retrograde development in.
"More Letters of Charles Darwin Volume II" by Charles Darwin