Thoracica is a superorder of crustaceans which contains the most familiar species of barnacles found on rocky coasts, such as Semibalanus balanoides and Chthamalus stellatus. They have six well-developed limbs, and may be either stalked or sessile. The carapace is heavily calcified. The group includes free-living and commensal species. ==Classific...
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• (n. pl.) A division of cirripeds including those which have six thoracic segments, usually bearing six pairs of cirri. The common barnacles are examples.
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http://thinkexist.com/dictionary/meaning/thoracica/
(from the article `cirripede`) The principal superorder, however, is the Thoracica. It comprises the orders Pedunculata and Sessilia and includes the goose and acorn barnacles. ... ...posterior cirri concentrated at end of trunk; widely distributed in coralline seas, most primitive members in deep sea; approximately 1 mm in ... [2 re...
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http://www.britannica.com/eb/a-z/t/42
Tho·rac'i·ca noun plural [ New Latin ]
(Zoology) A division of cirripeds including those which have six thoracic segments, usually bearing six pairs of cirri. The common barnacles are examples.
Found on
http://www.encyclo.co.uk/webster/T/46
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