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flood debris #9 - Scymnus rubricaudus

flood debris #9 - Scymnus rubricaudus
Medford, (~25 miles east of Philadelphia, PA) Burlington County, New Jersey, USA
December 27, 2009
Size: 1.8mm
Scymnus - further suggestions welcome :)

Images of this individual: tag all
flood debris #9 - Scymnus rubricaudus flood debris #9 - Scymnus rubricaudus flood debris #9 - Scymnus rubricaudus flood debris #9 - Scymnus rubricaudus

Moved from Scymnus.

S. rubricaudis?
Seems more yellow than reddish, but everything else matches. It also has some resemblance to S. fraternus etc., but is much too small for any of those species; it fits the size range of S. rubricaudis, though.

anything you'd like me to check further (I should probably re-check the size, as I normally "pixel-measure" everything)?

size and prosternal carinae
If you could push the forelegs aside a little and get a shot of the anterior end of the prosternal carinae that'd be great!

first part
well, I got the first part done - I re-found the beetle - not always a certainty :) It's in the relaxing jar now, hopefully to be imaged tomorrow.

thanks! - matches S. rubricaudus
(I just realized I spelled "rubricaudus" wrong the whole first set of comments, d'oh!)

The slightly converging intercoxal carinae, reaching the anterior margin of the prosternum, exactly match Gordon's description of S. rubricaudus. The only thing I'm not totally convinced about is the rear end color - seems more yellowish than reddish - but the red pigment of coccinellids is always fugitive after death, and the time it spent in the water could've assisted the fading color.

Tonight I managed to confirm the size via direct measurement. 1.8mm as shown, likely no more than 2.0mm as formerly walking around.

also matches S. rubricaudus...
I must've keyed this out half a dozen times and it always comes up S. rubricaudus, and everything about it matches the external description in Gordon except the non-reddishness! And I think that can be explained by water leaching the color while it was becoming flood debris. (Plus, I'm slightly red-green colorblind and I don't see red as well as most people.)

I'm ready to call it S. rubricaudus and create a page for it, what do you think?

you already know far more than I do regarding this one. The color currently is a yellow w/o much red tone at all (as shown), but as you say, it likely was more red before the flood.

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