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Beetle with brown

Beetle with brown "bubbles" - Dactylosternum
Alameda County, California, USA
November 6, 2011
Size: 5.2 mm bl
Rescued from water dish, morning.

Images of this individual: tag all
Beetle with brown Beetle with brown Beetle with brown


Cymbiodyta columbiana (Leech)
Nice! A distinctive western species- the deeply impressed striae are diagnostic. C. pacifica is similar but has the striae less developed, confined to the lateral margins, and not as deeply impressed (see guide photos). Would love to have it for my personal collection if you have kept it.

This is actually a species of Dactylosternum, which is in a different subfamily. Note the short palps, and semi-distinctive club, shape of head and pronotum. Western Cymbiodyta are not at all easy to ID even with dissected specimens and comparative material--I would generally discourage species ID with photos except in very rare cases. Deeply impressed stria mentioned here are not characteristic of C. columbiana but would suggest C. punctatostriata if a CA Cymbiodyta did have such a feature (which, coincidentally is perhaps the only easy-to-ID CA species). The mites are also a give-away that it is likely a terrestrial species (water mites are shaped differently and almost never on the dorsum like this).

Thanks for the new ID
I moved the images. The details are too technical for me, except that being a terrestrial species is consistent with the beetle's behavior in the water. It seemed to be trying to get out.

Thanks for the ID
The beetle isn't available. I released it after photographing.

Moved from Beetles.

the 'bubbles' are phoretic mites.

Someone more familiar with this family can take the ID further.

That one . . .
got a little too philious of hydro.

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