Key to Order Amphipoda

Phylum Arthropoda
 Subphylum Crustacea
  Class Malacostraca
   Subclass Eumalacostraca
    Superorder Peracarida

Taken primarily from  Kozloff, 1987, 1996  p. 346 (Copyright 1987, 1996, University of Washington Press.  Used in this web page by permission of University of Washington Press)
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1a  Pereon consisting of 7 pereonites, all of which have well developed pereopods; abdomen not vestigial; body neither especially slender nor resembling that of a praying mantis 2
1b Pereon consisting of 6 visible pereonites, some of which have only vestigial pereopods; abdomen vestigial; body (except for species found on whales) usually slender and often resembling that of a praying mantis Suborder Caprellidea
2a Eyes generally large, occupying most of the surface of the head; coxae of pereopods small and often fused with the body; usually planktonic, associated with Jellyfish, or occupying the tunic of dead salps Suborder Hyperiidea
2b Eyes usually present and conspicuous, but not so large as to occupy most of the surface of the head; coxae of pereopods well developed, and usually expanded into platelike structures; mostly benthic, but a few species are planktonic Suborder Gammaridea



Taxonomic Levels Represented in this Key:

  Suborder Caprellidea
  Suborder Gammaridea



Page created by Christina Smith, 7-2002
Edited by:  Dave Cowles 8-2002, 2005
Edited by:  Hans Helmstetler  11-2002