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  1. Thecostraca - Wikipedia

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    Thecostraca is a class of marine invertebrates containing over 2,200 described species. Many species have planktonic larvae which become sessile or parasitic as adults . The most prevalent subgroup are the barnacles (subclass Cirripedia), constituting a little over 2,100 known species.
    en.wikipedia.org
    This article follows Chan et al. (2021) and the World Register of Marine Species in placing Thecostraca as a class of Crustacea and in the following classification of thecostracans down to the level of orders. Previously, Thecostraca was considered a subclass of Maxillopoda.
    en.wikipedia.org
    The Thecostraca (Maxillopoda) rank among the most commonly encountered marine crustaceans in the world. They deviate from almost all other Crustacea in that only the larvae are free-living, while the adults are permanently sessile as either suspension feeders or as various types of parasites.
    That phylogeny includes 79 species from the three infraclasses of Thecostraca, the Facetotecta (seven species), Ascothoracida (five spp.), and Cirripedia (67 spp.), the last represented by three superorders, the Acrothoracica (three spp.), Rhizocephala (25 spp.) and Thoracica (39 spp.).
  3. Thecostraca - Animalia

  4. Thecostraca – Wikipedia

  5. Thecostraca - Animalia