Zuphium americanum? - Zuphioides americanum

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Home » Guide » Arthropods (Arthropoda) » Hexapods (Hexapoda) » Insects (Insecta) » Beetles (Coleoptera) » Adephaga » Ground Beetles (Carabidae) » Harpalinae » Harpalitae » Zuphiini » Zuphioides » Zuphioides americanum

Photo#1904894

Copyright © 2020 Glen Forister

Zuphium americanum? - Zuphioides americanum

700’ elevation, Loomis, 38.8198, -121.1173, Placer County, California, USA
May 27, 2020
Size: 5.5 mm

Taken from 20 watt UV light bucket trap set out and collected after 6 nights & days.

Posted to add CA to the distribution map - the only state west of TX so far.

I keyed this out to genus in Arnett (1). BG page states "Very narrow neck is unique among the Nearctic carabids" so I didn't picture various characters to prove identity, but they can be supplied upon request.

Z. americanum is the only species in the west, so it must be this. I don't see any mention of characters or keys to identify it.
======================================
Note: September 26, 2020.
I sent this specimen to Dr. Kipling (Kip) W. Will, UC Berkeley, CA. He determined by physical examination this specimen is Zuphioides americanum. I will add a comment with this information also.

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Zuphium americanum? - Zuphioides americanum

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Contributed by Glen Forister on 12 October, 2020 - 10:46am
Last updated 26 September, 2022 - 1:28pm

Moved

Moved from Zuphioides pseudamericanum.

… Glen Forister, 26 September, 2022 - 1:28pm

Moved

Moved from Zuphium.

… Glen Forister, 12 October, 2020 - 8:28pm

Zuphioides americanum

I sent this specimen to Dr. Kipling (Kip) W. Will, UC Berkeley, CA. He determined by physical examination this specimen is Zuphioides americanum. So, I will move it to that location and notify Dr. Peter Messer.

… Glen Forister, 26 September, 2022 - 1:27pm

New state record for California.

Thank you Glen & Kip for making the physical determination happen. I'll add it to the Registry of North American Caraboidea.

… Peter W. Messer, 26 September, 2022 - 4:40pm

Zuphium longicolle and Z. pseudamericanum reported in CA,

but neither species fit well the dorsal habitus image in my opinion. Image appears like Z. americanum, but that would mean accepting a new California state range. Placer County is in the northern part of state. The known records closest to CA are western Oregon and Arizona. References: Catalogue by Bousquet (2012) and key to species by Mateu (1981).

Notes from Mateu (1981: Compared to Z. americanum, the pronotum of Z. pseudamericanum should have base more constricted and the head reddish-testaceous, not blackish as in americanum. The image certainly shows the prontal base strongly constricted, but the head is blackish. Go figure!

… Peter W. Messer, 12 October, 2020 - 3:55pm

Pub?

Can't find any reference to Mateu (1981) in BG or Google Scholar. More specific title maybe or access to PDF and I can check the key.

… Glen Forister, 12 October, 2020 - 4:02pm

I don't believe a PDF is freely available online,

so have your local library get it (photo-scan or pdf) via interlibrary loan. I think that's how I got a hard copy scan years ago. Please see my updated note above.

Mateu J (1981) Revision de los Zuphium Latreille del continente Americano (Coleoptera: Carabidae).
1a. Nota. Folia Entomológica Mexicana 47: 111-128

… Peter W. Messer, 12 October, 2020 - 4:11pm

Head color

I've attached an image of the head with better lighting to show the darker red of the head in relation to the rest of the light red color of the rest of the body. This should make a big difference in your opinion.

Also, CA is between OR & AZ, so not surprising it would be here on the west slope of the Sierras.

… Glen Forister, 12 October, 2020 - 4:45pm

Help with me head color:

dark reddish or blackish?

… Peter W. Messer, 12 October, 2020 - 5:20pm

color?

Dark red. Not blackish.

… Glen Forister, 12 October, 2020 - 5:52pm

Moving it

Personal email 10/12/2020 from Peter Messer: "If indeed reddish head, let’s just say your fine catch in Placer Co. is (provisionally) Zuphium pseudamericanum, a species already known in CA, but new to BugGuide.

So, with Peter's advise I'll move this specimen to Z. pseudamericanum.

… Glen Forister, 12 October, 2020 - 8:27pm

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