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Lasioglossum guide being overhauled

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  • Sam Droege
    All: Just to let you know that I am now actively working on the Lasioglossum guide. Tomorrow, with the overnight refresh, all of Jason Gibbs species should
    Message 1 of 1 , Oct 1, 2012
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      All:

      Just to let you know that I am now actively working on the Lasioglossum guide.  Tomorrow, with the overnight refresh, all of Jason Gibbs' species should now be in the guide.

      I will gradually work on updating the character scores for the FEMALES of the species in the guide and have started today with the Parasitic species.  

      Here are the most relevant 2 characters

      Thanks

      sam


      Parasitic Females - Mandibles a simple blade without any additional teeth or lobes

      L. ascheri  - Propodeal triangle with striation extending nearly to the rim - Cheeks extremely wide - Mandibles very long and thin, extending nearly to the base of the opposite mandible - The mesepisturnum is distinctly PITTED - Hypostomal cavity edges parallel

      L. cephalotes - Propodeal triangle with striations restricted to the very base of the propodeum, these strations often just small bumpts scattered along the base, extending far less than half-way down the triangle - Cheeks extremely wide, its bottom edge forming a blunt approximately 90 degree angle - Mandibles very long, not far from the the tip the upper edge makes a rapid sinuate transition as the mandible rapidly widens - Width of the clypeus greater than the length of the compound eye - The carinate rim of the hypostomal cavity remains at approximately the same height throughout it length - The clypeus extremely flat and longitudinally short - Mesepisternum very smooth and clearly and densely PITTED - head width 1.80–2.02 mm

      L. furunculum -  Propodeal triangle with striation extending nearly to the rim - Cheek width and length and length of mandible similar to that of non-parasitic species of Dialictus - Pronotal ridge sharply angled and similar to all the parasitic species except L. simplex

      L. lionotum - Propodeal triangle with NO STRIATIONS whatsoever or a few short striations near the base  - Cheeks extremely wide, its bottom edge forming a blunt approximately 90 degree angle -  Mandibles very long and thin, extending nearly to the base of the opposite mandible - In direct comparison much smaller, the size of L. imitatum - Width of the clypeus than the length of the compound eye - The carinate rim of the hypostomal cavity remains at approximately the same height throughout it length - The clypeus extremely flat and longitudinally short - head width 1.25–1.30 mm

      L. simplex -  Propodeal triangle with striation extending nearly to the rim - Cheek width and length and length of mandible similar to that of non-parasitic species of Dialictus - UNIQUE in that the pronotal ridge is SMOOTHLY ROUNDED similar to non-parasitic species of sub-genus Dialictus

      L. platyparium -   Propodeal triangle with striation extending nearly to the rim - Cheeks extremely wide, its bottom edge forming a blunt approximately 90 degree angle - Mandibles, broad and long, from the tip they widen but then narrow slightly again before widening to the base of the mandible, note, some specimens can have a very minute tooth microscopic in size and no where near the size of non-parasitic species - Width of the clypeus less than the length of the compound eye - UNIQUE, the carinate rim of the hypostomal cavity approximately doubles in height above the surface from the base to the mandibles - The clypeus extremely flat and longitudinally short

      L. rozeni - Propodeal triangle with striation extending nearly to the rim, though the central striations often only reach about half-way, these striations strong and prominent - Cheeks extremely wide - Mandibles very long and thin, widening uniformly from the tip to the base without any abrupt transitions and extending nearly to the base of the opposite mandible - Edges of the hypostomal cavity clearly diverge as they extend to towards the mandibles, the carinate rim remains the same height throughout its length - Mesepisternum not pitted, or only very vagulely so

      Parasitic Females - Mandibles with a distinct tooth on the upper margin, set slightly back from the tip

      L. curculum - Propdeal triangle with clear and priminent striations - Mandible clearly with a TOOTH similar ot non-parasitic species - Width of the clypeus greater than or equal to the length of the compound eye - Cheeks extremely wide, its bottom edge forming a blunt approximately 90 degree angle - The carinate rim of the hypostomal cavity remains at approximately the same height throughout it length - The clypeus extremely flat and longitudinally short - Told from the similar L. michiganense by the presence of CLEARLY visible pits scattered across the mesepisturnum and no obvious striations present

      L. izawsum  - Cheeks moderately wide or similar to non-parasitic species and its bottom edge evenly rounded again similar to other non-parasitic species -

      L. michiganense - Propodeal triangle with clear striations - Width of the clypeus less than the length of the compound eye - Cheeks  wide, but not greatly wider than that the width of the compound eye - The carinate rim of the hypostomal cavity remains at approximately the same height throughout it length - The clypeus extremely flat and longitudinally short - UNIQUE in the presence of raised vertical striations on the mesepisturnum amidst some vague pits, note that these striations are not as prominent as those found on the propodeal triangle

      L. platyparium - Propodeal triangle with clear striations - Mandibles with only a very tiny tooth, this tooth much smaller than any found in the non-parasitic species and easily overlooked, sometimes with no tooth at all, broad and long, from the tip it widens and then narrows again before widening to the base, note, some specimens can have a very minute tooth microscopic in size and no where near the size of non-parasitic species - Width of the clypeus less than the length of the compound eye - Cheeks extremely wide, its bottom edge forming a blunt approximately 90 degree angle - UNIQUE, in that the carinate rim of the hypostomal cavity approximately doubles in height above the surface from the base to the mandibles - The clypeus extremely flat and longitudinally short - UNIQUE in labrum usually has a PROMINENT projecting bump or mound in the center

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