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The case of the squared-off clypeus - L. admirandum vs L. weemsi females

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  • Droege, Sam
    Ah, what joy the richness of Dialictus brings...below is a little couplet that takes Jason Gibb s notion of the squared off clypeus in his key and extends is
    Message 1 of 1 , Mar 12, 2013
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      Ah, what joy the richness of Dialictus brings...below is a little couplet that takes Jason Gibb's notion of the squared off clypeus in his key and extends is to the length of a novella.  



      L. admirandum vs L. weemsi - Abdomen, T1, hair fan partially open at top, but fan extensive in both species

      L. admirandum - Head, turn the specimen so that the FACE of the clypeus is at right angles to your eye, note that the distal rim or edge of the clypeus is straight but angles off to either side in the direction of the nearest edge of the compound eyes, this angle is obtuse, this is made clearer if you turn the specimen so that it is facing you and adjust the specimen so that you are looking straight on at the labrum and you can sight down the top of the clypeus so that it the clypeus is at right angles to your eye, now look at the RIM of the clypeus, the upper straight portion forms a thin, level, straight line, to either side of that straight side the rim bends downward at a 45 degree angle and extends to either side of the labrum, the lateral faces of that angled portion of the clypeal rim are clearly visible and similar to a DOG-EARED corner of a page from a book - In direct comparison, the minute projecting teeth found at the far sides of the straight portion of the clypeal rim mentioned above are smaller, more rounded, and obtuse - , In direct comparison L. admirandum also tends to have a slightly hairier abdomen, particularly T4, brighter yellow tegulae, and T2 with more extensive yellow and translucence along the rim 

       

      L. weemsi - Head, turn the specimen so that the FACE of the clypeus is at right angles to your eye, note that the distal rim or edge of the clypeus is straight but angles back roughly, though at time indistinctly at right angles to that outermost straight portion of the rim and does NOT angle towards the near corner of the compound eyes, there is a general impression of this portion of the clypeus being RECTANGULAR, but at times it will be difficult to decide, however, things will be made clearer if you turn the specimen so that it is facing you and adjust the specimen so that you are looking straight on at the labrum and you can sight down the top of the clypeus so that it the clypeus is at right angles to your eye, now look at the RIM of the clypeus, the upper straight portion forms a thin, level, straight line, to either side of that straight side the rim bends downward at a 45 degree angle and extends to either side of the labrum, the lateral faces of that angled portion of the clypeal rim are NOT or only minutely visible - In direct comparison, the minute projecting teeth found at the far sides of the straight portion of the clypeal rim mentioned above are larger, more pointed, and roughly right angles – Note, these characteristics also hold for L. hitchensi

       

      Nothing is more difficult, and therefore more precious, than to be able to decide.
       
              - Napoleon Bonaparte

      sam


      --
      Bees are Not Optional
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