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  • barnacle
  • Another crustacean, the large acorn shell ( Balanus psittacus ), a barnacle (order Cirripedia) measuring up to 27 centimetres (11 inches) in length, is regarded as a delicacy in South America , and a stalked barnacle ( Mitella pollicipes ) is eaten in parts of France and Spain. (britannica.com)
  • nauplius
  • The names of these genera have become generalised to cover specific larval stages across wide groups of crustaceans, such as zoea and nauplius . (wikipedia.org)
  • Crustaceans share several derived features: the nauplius larva, two pairs of antennae and biramous ('two branched') second antennae. (els.net)
  • limbs
  • The Cephalocarida, first discovered near New York (1955), are reminiscent of the primitive crustacean condition: many segments and trunk limbs are very similar, one after another (serial homology). (thecanadianencyclopedia.com)
  • definition
  • Because there are many exceptions to the basic features, however, a satisfactory inclusive definition of all the Crustacea is extraordinarily hard to frame. (britannica.com)
  • adults
  • Antonie van Leeuwenhoek was the first person to observe the difference between larval crustaceans and the adults when he watched the eggs of Cyclops hatching in 1699. (wikipedia.org)
  • Some of the parasitic forms are so modified and specialized as adults that they can only be recognized as crustaceans by features of their life histories. (britannica.com)
  • known
  • The scientific study of crustaceans is known as carcinology (alternatively, malacostracology, crustaceology or crustalogy), and a scientist who works in carcinology is a carcinologist . (princeton.edu)
  • Structure
  • Crustacean cardioactive peptide (CCAP) is a highly conserved, amidated cyclic nonapeptide with the primary structure PFCNAFTGC-NH2 (ProPheCysAsnAlaPheTyrGlyCys-NH2) and a disulfide bridge between Cys3 and Cys9. (wikipedia.org)