Aquatic Insect #4 ID?

Discussion in 'Fly Fishing Entomology' started by Taxon, May 14, 2012.

  1. Taxon Moderator

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    [IMG]

    This aquatic insect was collected in a kicknet sample five summers ago on the South Fork Snoqualmie River. It is 2.5 mm in body length. Can you identify it by any of the following:

    Order common name:
    Order taxonomic name:
    Family common name:
    Family taxonomic name:
    Genus taxonomic name:
    Species taxonomic name:
    Lifestage:
  2. jwg Active Member

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    Heteroptera

    Jay
  3. jwg Active Member

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    Revision

    Beetles
    Order Coleoptera

    Predaceous Diving Beetles
    Family Dytiscidae

    Genus
    Liodessus

    jay
  4. jwg Active Member

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    Adult

    Jay
  5. Taxon Moderator

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    Good job, Jay. Incidentally, its body length is 2.5 mm, which may lead you the correct genus and species.

    IDENTIFICATIONS

    Order common name: Beetle (jwg)
    Order taxonomic name: Coleoptera (jwg)
    Family common name: Predaceous Diving Beetle (jwg)
    Family taxonomic name: Dytiscidae (jwg)
    Genus taxonomic name:
    Species taxonomic name:
    Lifestage: Adult (jwg)
  6. jwg Active Member

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    Boreonectes

    jay
  7. Taxon Moderator

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    Hi Jay,

    Nice work, but no cigar. ;) Right Subfamily and Tribe, but wrong Genus.
  8. jwg Active Member

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    Heterosternuta

    Jay
  9. Taxon Moderator

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    No, but try comparing the following BugGuide taxonomy:

    Phylum Arthropoda - Arthropods
    Class Insecta - Insects
    Order Coleoptera - Beetles
    Suborder Adephaga - Ground and Water Beetles
    Family Dytiscidae - Predaceous Diving Beetles

  10. jwg Active Member

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    I wonder how many guesses I get

    Genus Stictotarsus

    Jay
  11. jwg Active Member

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    Revision:

    I just found the exact image copyright Roger Rohrbeck!

    Oreodytes - Oreodytes obesus
    S. Fork Snoqualmie River, King County, Washington, USA
    September 20, 2007
    Size: ~2 mm.
  12. Taxon Moderator

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    Hi Jay,

    Yes you did, but perhaps more importantly, you learned about the existence of a resource on my website, which can greatly simplify future searches. ;)

    IDENTIFICATIONS

    Order common name: Beetle (jwg)
    Order taxonomic name: Coleoptera (jwg)
    Family common name: Predaceous Diving Beetle (jwg)
    Family taxonomic name: Dytiscidae (jwg)
    Genus taxonomic name: Oreodytes (jwg)
    Species taxonomic name: obesus (jwg)
    Lifestage: Adult (jwg)