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Clamp-tipped Emerald (Somatochlora tenebrosa)
Photo#1603916
Copyright © 2018
ophis
Clamp-tipped emerald exuvia -
Somatochlora tenebrosa
Walpole, Norfolk County, Massachusetts, USA
August 8, 2018
Size: 13.1 mm
Inside culvert connecting to Pettee's Pond.
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Contributed by
ophis
on 17 October, 2018 - 5:59pm
species ID
This and two other exuvia found nearby, as well as
a fourth from Pope's Pond in Milton
, were from typical small (< 5 acres) muddy-bottomed suburban impoundments rather than the small streams usually cited for
S. tenebrosa
. In addition, the three I measured were all 13-14 mm rather than ~20 mm cited in published sources. However, of the four non-state-listed congeners recorded in MA, (
S. minor, S. tenebrosa, S. williamsoni
, and S.
walshii
), I concluded the following based on the drawings on P. 410 Of Needham, Westfall, and May, 2014:
--not
S. minor
because
S. minor
lacks fringe of short setae on rear dorsal edge of 8th and 9th tergites
--not
S. walshii
because dorsal spine on 8th tergite extends over about 1/3 length of 9th tergite, not half or more
--not
S. williamsoni
because dorsal spine on 9th tergite extends nearly all the way over 10th tergite, not about 1/4 its length
…
ophis
, 17 October, 2018 - 6:20pm
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