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Department ofVertebrate Zoology

Division of Fishes

Carl Hansen
© Smithsonian Institution
bar Stanley Weitzman
    Stanley H. Weitzman
    Research Scientist Emeritus

  • Phone: (202)633-1208
  • Fax: (202)633-0182
  • E-mail: weitzmas[at]

  • Mailing Address:
    Smithsonian Institution
    PO Box 37012, MRC 159
    Washington, DC 20013-7012

  • Shipping Address:
    Smithsonian Institution
    National Museum of Natural History
    10th and Constitution Ave, NW
    Washington, DC 20560-0159


Ph.D. Stanford University, 1960
M.A. University of California, Berkeley, 1953
B.A. University of California, Berkeley, 1951

Research Interests

The following research topics are my primary interests and published products: Systematics, comparative gross anatomy (osteology, etc.) of the entire specimens, plus the tissue histology of gonads and ultrastructure of reproductive cells, reproductive modes, and secondary reproductive organ (for example male courtship pheromone organs) and biogeography of inseminating and non-inseminating Neotropical fishes of the order Characiformes. This data is also used for proposing and publishing hypotheses of evolutionary relationships among the members of especially the freshwater fish family Characidae. This research has essentially answered questions about various aspects of their diverse reproductive modes, provided new insights about their phylogenetic relationships and initiated a beginning base for some biogeographical studies of South American freshwater fishes.

Recent Publications

Menezes, Naercio A., Weitzman, Stanley H. and Teixeira, T. F. 2016. Redescription of Hysteronotus megalostomus (Characiformes: Characidae: Stevardiinae), a poorly known characid from tributaries of the Rio São Fancisco, Brazil with comments on the conservation of the species. Journal of fish biology, 89(1): 495-509. doi:10.1111/jfb.13000

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