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Nephus intrusus, dorsal - Nephus intrusus

Nephus intrusus, dorsal - Nephus intrusus
Ames, Story County, Iowa, USA
September 24, 2009
Size: 1+ mm
I want to call it a Coccinellid but it's so small I just can't see.

"An annotated checklist of the lady beetles (Coleoptera: Coccinellidae) of Iowa, U.S.A." (Insecta Mundi 0091, A Journal of World Insect Systematics, Sept. 25, 2009), L. Hesler says: “Nephus (Scymnobius) intrusus (Horn). Wingo (1952: 43) noted this species as occurring in Iowa but presented no records. Distribution of N. intrusus in Iowa is plausible, as it has been found throughout the eastern U.S. (Gordon 1985: 310).

Images of this individual: tag all
Nephus intrusus, dorsal - Nephus intrusus Nephus intrusus, ventral - Nephus intrusus

thanks a lot, Tim! very thorough.
Moved from Scymnobius.

Moved very tentatively -- i'll ask around; nice LB anyway
Moved from ID Request.

Is this...
a valid genus now? Gordon (1985) lists is as a sybgenus of Nephus.

Vandenberg(1) seems to concur -- the rank should be changed in the guide, but i'd leave it to our LB curators [Tim & Abby]

coccinellid subgenera
During the giant Coccinellidae reorganization, when there was much concern about how many levels of navigation there were going to be, I skimped a little on subgenera. But the people worried about being able to find H_armonia aren't the same ones who'll be navigating the depths of Scyminae anyway, so subgenus comin' right up :-)

good to know!
--and thanks

S. intrusus
Leaving the genus / subgenus to others, from Gordon '76(1), this certainly appears to be S. intrusus (Horn). From the subgenus (in Gordon), keys well, and description matches very well. Most of the rest of subgenus looks to be western. And coloration appears to be fairly unique for the larger genus (Nephus).

I've seen...
coccinellids this small (Diomus comes to mind). But I'd prefer to see the antennae to make a family-level ID.

I spoke too soon...
the ventral shot was posted as I was writing my first comment

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