Gyrinidae - Dineutus angustus

thanks for the nice addition, gentlemen.

… v belov, 3 January, 2013 - 12:50pm

Moved

Pretty sure this is it..the elytra are non-striate and shiny, which are characteristic of the genus..locality also fits..Nice find!

… Tim Loh, 12 April, 2012 - 1:21am

Dineutus angustus

I am personally convinced that this is a species of Dineutus, probably angustus if you choose to accept angustus as a valid species and not a synonym of D. discolor. The reason I believe this is that the subocular ridge of the gena of this specimen is very explanate as is the case in Dineutus and not in Gyretes. Also although it is very difficult to see in this specimen the labrum does not appear setose dorsally as is the case in members of Dineutus, while in Gyretes iricolor it appears setose dorsally. And again although the image is bad there doesn't appear to be the elytral setose margin which is diagnostic of Gyretes. The apex of the elytra have a lateral sinuation and are raised medially similar to Dineutus angustus or discolor, while in Gyretes the elytra are truncate apically. The elongate and highly convex form make me believe that this is D. angustus whose typical form is known from peninsular Florida. As this locality is fairly near there I would feel safe saying this is probably D. angustus.

… Grey Gustafson, 24 May, 2012 - 9:48am

But I should also point out t

But I should also point out that I don't like identifying specimens to species from such a picture, but there is only one highly angular and convex (cylindrical almost) Dineutus from N. America and that is Dineutus angustus from around peninsular Florida. Another diagnostic character of Gyretes that the image does not appear to have is the conical ultimate segment of the abdomen. The abdomen of the species in this pictures appears broad and flat, not conical.

… Grey Gustafson, 24 May, 2012 - 9:52am

The specimen is in the freezer r

The specimen is in the freezer right now, I still haven't pinned it, when I pin it (hopefully soon) would you like me to take some more pictures of certain areas?

… Jesse Chesla, 24 May, 2012 - 2:35pm

Sure that would be helpful. I

Sure that would be helpful. If you could take a dorsal and a ventral. Thanks.

… Grey Gustafson, 28 May, 2012 - 4:49pm

I know it took awhile,

but here they are

… Jesse Chesla, 27 December, 2012 - 10:39pm

Dineutus angustus

Yes, your additional images helped confirm this is Dineutus angustus. Especially the red venter and the shape of the elytral apices. The ventral pic also shows that this is not the genus Gyretes as it lacks the conical ultimate abdominal segment.

Dineutus angustus is a good find, it is a relatively uncommon whirligig due to its relatively smaller range.

… Grey Gustafson, 3 January, 2013 - 12:39pm

Thanks!

Always great to hear I got an uncommon find!

… Jesse Chesla, 3 January, 2013 - 5:07pm