Agonum muelleri? - Agonum errans - BugGuide.Net

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Home » Guide » Arthropods (Arthropoda) » Hexapods (Hexapoda) » Insects (Insecta) » Beetles (Coleoptera) » Adephaga » Ground Beetles (Carabidae) » Harpalinae » Harpalitae » Platynini » Agonum » Subgenus Olisares (Agonum Subgenus Olisares) » errans group (Agonum errans group) » Agonum errans

Photo#1788503

Copyright © 2020 Owen Strickland

Agonum muelleri? - Agonum errans -

Toronto, Ontario, Canada
March 16, 2020
Size: 9 mm

Lovely colours on this one! Closest match I can find is Agonum muelleri. Would that be close to correct? Have specimen for more photos if needed.

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Contributed by Owen Strickland on 16 March, 2020 - 6:27pm
Last updated 9 March, 2024 - 12:21pm

Everything I see suggests A. errans, rather

The distinctly punctate elytral striae at the base are a strike against muelleri, in the keys I've seen and diagnosis in Lindroth

Moved from Agonum muelleri.

… Curt Harden, 27 August, 2023 - 6:07am

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Yes, Agonum errans is a much better fit image-wise.

I have several determined specimens of both A. errans and A. muelleri to compare. The differences in pronotum shapes and degrees of elytra stria punctation are quite obvious side-by-side. I did not receive Owen's specimens so I'll chalk this one up as another of my many photographic fooleries on BugGuide. Thank you Curt for your usual deeper look at images.

… Peter W. Messer, 27 August, 2023 - 9:54am

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Moved

Moved from Ground Beetles.

… Peter W. Messer, 19 March, 2020 - 1:26pm

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Agonum muelleri is indeed the best fit

based on strong metallic luster; pronotum medial base without bead; scape (= antennal segment #1) and tibiae distinctly pale against other dark body parts; known in Ontario. In scanning through other posted examples of this species (some likely in error), I believe Owen's image could be the most representative, therefore what I call the prime exemplar or prototype for A. muelleri on BugGuide.

… Peter W. Messer, 17 March, 2020 - 8:22am

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Thank you!

For the in-depth reasoning and confirmation. Hope to go find some more neat beetles tomorrow.

… Owen Strickland, 17 March, 2020 - 6:19pm

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