, Volume 538, Issue 1–3, pp 179–192 | Cite as

Myodocopa (Crustacea: Ostracoda) as models for evolutionary studies of light and vision: multiple origins of bioluminescence and extreme sexual dimorphism



Evolutionists often use phylogeny to examine independent evolutionary events in search of generality. Therefore, groups of organisms rich in such independent character transitions are particularly valuable for the study of evolution. With respect to eyes, vision, and light-related characters, one such group is Ostracoda (Crustacea). Phylogenies of ostracods, derived from DNA sequence data and morphological characters, are presented. These inferred relationships largely agree with previous assessments of ostracod phylogeny, with the exception of paraphyletic Philomedidae. Based on methods of character reconstruction using these inferred relationships, different groups of ostracods probably evolved both bioluminescence and extreme sexual dimorphism (females lack eyes, males have large eyes) multiple times. Furthermore, myodocopid ostracods may have evolved compound eyes independently of other arthropods. For these and other reasons, it is proposed that the Ostracoda are an exceptionally important group for studying the evolution of vision- and light-related characters.


Ostracoda Myodocopa eyes light bioluminescence evolution sexual dimorphism phylogeny 


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Copyright information

© Springer 2005

Authors and Affiliations

  1. 1.Ecology and Evolution, Ecology Evolutiom and Marine BiologyUniversity of Chicago, University of CaliforniaChicago, Santa BarbaraUSA

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