Thecostraca

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Thecostraca
Temporal range: Carboniferous–Recent
A barnacle of the family Balanidae, Mission Beach, Queensland, Australia, 2001.
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Superclass: Multicrustacea
Class: Thecostraca
Gruvel, 1905
Subclasses

Thecostraca is a

parasitic as adults
.

The most prevalent subgroup are the barnacles (subclass Cirripedia), constituting a little over 2,100 known species.[1]

The subgroup

nauplii called "y-larvae". These larvae have no known adult form, though it is suspected that they are parasites, and their affinity is uncertain. Some researchers believe that they may be larval tantulocaridans. No larval tantulocaridans are currently known.[2]

The group

coelenterates and echinoderms.[1][3]

The nauplius larvae (sometimes absent) can be both lecithotrophic (non-feeding) and planktotrophic (feeding), and is followed by a larval stage called the cyprid, which is always lecithotrophic. The cypridoid larva are referred to as the y-cyprid in the Facetotecta, the a-cyprid in the Ascothoracida, and the c-cyprid, or just cyprid, in the Cirripedia.[4][5]

Classification

This article follows Chan et al. (2021) and the World Register of Marine Species in placing Thecostraca as a class of

Maxillopoda.[2] Significant changes in the organization of Cirripedia's orders, families, and genera were introduced in 2021 by Chan et al. and accepted by the World Register of Marine Species.[1][6]

Class Thecostraca Gruvel, 1905

Phylogeny

The following cladogram depicts the internal relationships of the Thecostraca as of 2021.[1][7]

Thecostraca

References

  1. ^ a b c d e Chan, Benny K. K.; Dreyer, Niklas; Gale, Andy S.; Glenner, Henrik; et al. (2021). "The evolutionary diversity of barnacles, with an updated classification of fossil and living forms". Zoological Journal of the Linnean Society. 193 (3): 789–846.
    hdl:11250/2990967
    .
  2. ^ a b Joel W. Martin & George E. Davis (2001). An Updated Classification of the Recent Crustacea (PDF). Natural History Museum of Los Angeles County. pp. 132 pp.
  3. ISBN 978-0-19-922949-9
    .
  4. ^ Induced metamorphosis in crustacean y-larvae: Towards a solution to a 100-year-old riddle
  5. ^ Atlas of Crustacean Larvae
  6. ^ "World Register of Marine Species, class Thecostraca". Retrieved 2021-08-22.
  7. PMID 22532607
    .

External links
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