Rostrum (anatomy)

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The rostrum (beak) of a bottlenose dolphin

In anatomy, the term rostrum (from the Latin rostrum meaning beak) is used for a number of phylogenetically unrelated structures in different groups of animals.


  • In crustaceans, the rostrum is the forward extension of the carapace in front of the eyes.[1] It is generally a rigid structure, but can be connected by a hinged joint, as seen in Leptostraca.[2]


The beak or snout of a vertebrate may also be referred to as the rostrum.

See also[edit]


  1. ^ Charles Drew (November 17, 2003). "Crustacea". University of Bristol. Retrieved November 7, 2010. 
  2. ^ Todd A. Haney, Joel W. Martin & Eric W. Vetter (2007). "Leptostraca". In James T. Carlton. The Light and Smith Manual: Intertidal Invertebrates from Central California to Oregon (4th ed.). University of California Press. pp. 484–495. ISBN 978-0-520-23939-5. 
  3. ^ George Gordh, Gordon Gordh & David Headrick (2003). "Rostrum". A Dictionary of Entomology. CAB International. p. 792. ISBN 978-0-85199-655-4. 
  4. ^ Douglas Grant Smith (2001). "Mollusca (gastropods, pelecypods)". Pennak's freshwater invertebrates of the United States: Porifera to Crustacea (4th ed.). John Wiley and Sons. pp. 327–400. ISBN 978-0-471-35837-4. 
  5. ^ Burt Carter. "Cephalopods". Invertebrate Paleobiology. 
  6. ^ "Basic anatomy of Cetaceans - Dolphins". Robin's Island. Retrieved November 7, 2010. 
  7. ^ Wueringer BE, Squire Jr L, Kajiura SM, Hart NS and Collin SP (2012) "The function of the sawfish's saw" Current Biology, 22 (5): R150-R151. doi:10.1016/j.cub.2012.01.055