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Home » Guide » Arthropods (Arthropoda) » Hexapods (Hexapoda) » Insects (Insecta) » Ants, Bees, Wasps and Sawflies (Hymenoptera) » "Symphyta" - Sawflies, Horntails, and Wood Wasps » Cimbicid Sawflies (Cimbicidae) » Cimbex » Elm Sawfly (Cimbex americanus)
Photo#38968
Wasp - Cimbex americanus
Copyright © 2005 tom murray

Wasp - Cimbex americanus
Quabbin, Worcester County, Massachusetts, USA
May 26, 2002
It looks like a sawfly, but I've never seen a sawfly, or any other wasp for that matter, with clubbed antennae. It was large, about the same size as Monobia quadridens.
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Contributed by tom murray on 9 December, 2005 - 9:35am
Last updated 30 September, 2006 - 4:01pm

Moved
Moved from Cimbex.
… john and jane balaban, 30 September, 2006 - 4:01pm login or register to post comments

Cimbex americana
wing color varies in this sp.
… John S. Ascher, 30 September, 2006 - 1:36pm login or register to post comments

 
Thanks
for the help, John, and John & Jane.
… tom murray, 1 October, 2006 - 9:12pm login or register to post comments

Cimbex sp. (Cimbicidae)
Such 6-segmented, clubbed antennae are actually unique among Hymenoptera. They are the hallmark of the Cimbicid family, distantly related to the Tenthredinidae. The general habitus of this large, stout individual is typical of the genus Cimbex, which contains several similar species.
Most often, males are all black with yellowish antennae and tarsi, while females exhibit a more or less extended yellow and/or rusty color pattern on the body. But, some exceptions do occur - and the apex of the abdomen cannot be seen on this otherwise nice picture.
… Richard Vernier, 9 December, 2005 - 10:59am login or register to post comments

 
Cimbex sp.
Now that you identified the genus, I see there are a couple pictures of Cimbex americana in the guide. This is probably a different species, since the wings are black, and Cimbex americana has clear wings. Thanks for the quick response, and detailed explanation, Richard.
… tom murray, 9 December, 2005 - 11:28am login or register to post comments

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