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Tanystoma - Tanystoma maculicolle

Tanystoma - Tanystoma maculicolle
May 29, 2003
Size: 10.5 mm
This specimen of Tanystoma was collected in Indiana. It was found already dead on a shipment of items from California. I believe it to be T. maculicolle.

Great find in "Indiana" -- but I bet you won't count it as a new state record! This and your other recent good carabid images are very instructive as they show me interesting carabids outside my state of WI. I am not familiar with Tanystoma which I read is close to Agonum and restricted to West Coast. Since you likely keyed this specimen, what morphologic criteria did you use first for genus, then species? Thanks.

I assumed, based on origin of the shipment, that this is from California. Then keyed out with American Beetles. This guy has 5 discal setae on interval 3 and the apex of antenomere 2 has more than 4 setae. These separate it from Agonum in that key. The key uses characters of male genitalia in a couple of places which increases its difficultly somewhat, but I'm fairly confident of the genus.

I also "matched" it up with images in the guide already, which seem to be dead on. This isn't the best way to reach a species ID, but will do for me until I can pull a reference on the genus.

And yes, this isn't a new state record. I think it needs to be alive when it arrives!

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