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Ancyloscelis guide updated

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  • Michael Orr
    Hello all, This guide for genus has been created for the United States, accounting for the three Southwestern species of the group. Although there are only
    Message 1 of 1 , May 12, 2011
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      Hello all,


      This guide for genus has been created for the United States, accounting for the three Southwestern species of the group. Although there are only currently records for A. melanostoma in the North of Mexico, it was ultimately decided that the records were close enough to the Southwestern US that its inclusion within the guide would be wise. This guide was completed through the combined efforts of Jack Neff and myself, with loans from both the former and the Logan lab. Any suggestions for additional characters would be appreciated.

      This guide may be found at:
      http://www.discoverlife.org/mp/20q?guide=Ancyloscelis

      For the sake of convenience, here are the characters and their scorings:
      Female, head, mandibles, integumental color
      Dark, a brownish color similar to the mandible tip, although it may seem slightly more reddened basally (melanostoma)
      Light, white to pale amber, obviously much lighter than the mandible tips (apiformis, sejunctus)

      Females, A. apiformis vs A. sejunctus - WARNING, very hard to tell apart, use positively identified reference material if possible
      A. apiformis - Labrum with a central slightly raised unpitted line running longitudinally along its surface, this line sometimes infringed upon slightly by a few pits - In direct comparison, there are fewer white hairs just after the basitibial plate on the hind tibia - This species is only known in the US from TX
      A. sejunctus - Labrum bumpy throughout, if with any longitudinal line at the middle then it is VERY weak and most often almost completely obscured by pits - In direct comparison, there are more white hairs just after the basitibial plate on the hind tibia - The range of this species includes AZ, CO, TX, and likely NM

      Male, A. apiformis vs other species
      A. apiformis - Labrum nearly entirely pale, off-white to yellow - Clypeus with an apical band of off-white to yellow integument
      Other species - Labrum dark brownish or black, although it may sometimes be slightly paler medially - Clypeal rim as dark in coloration as the rest of the clypeus

      Male, abdomen, S6, form of emargination or concave area in the middle of the rim
      U-shaped, the indent here smoothly rounded throughout, with the sides of the emargination appearing to form an obtuse angle in relation to each other (sejunctus)
      V-shaped, with a distinct medial point where the two sides meet at an acute angle such that the emargination is not evenly curved throughout (apiformis, melanostoma)

      If you've read over the characters and found anything questionable, or have any suggestions for either diction changes or additional characters, please contact either myself (mco25@...) or Sam Droege (sdroege@...). We only have so many specimens of each species available to us, so we always welcome any user feedback that might benefit the resolving power or clarity of the guides.


      -Michael Orr



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