Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
black & white springtail - Seira dollfusi

black & white springtail - Seira dollfusi
Knowland Park, Oakland, Alameda County, California, USA
May 21, 2007
Size: 2.5mm
This springtail was in tall, dry grass. (Found several that looked like the same species.)

Images of this individual: tag all
black & white springtail - Seira dollfusi black & white springtail - Seira dollfusi black & white springtail - Seira dollfusi black & white springtail - Seira dollfusi

Finally moved these. Also I added two images from last year that show the scales better. I swept for more of these this year but didn't find any -- maybe it has been too cold for them to be out lately.

Moved from Orchesella gloriosa.

Thanks Joyce
for providing the additional pictures. The scale cover is definitly present. This confirms Seira (and excludes Orchesella).

Seira cf. dollfusi
Dear Joyce,
I have to reconsider my original ID...
Recently I have received some photographic records of Seira dollfusi from France (Europe). The pigment pattern of these specimens matches well with that of your specimen. But Seira dollfusi is not yet recorded from the USA...
Since you have found several specimens, it must be a local population. Could you look for them again and make a few new shots. The main issue here is to check whether or not the specimens have a scale cover. In Seira the body is covered by relatively large scales. These should produce iridisation effects depending on light conditions.

yes, will find more
I found this one (and the others like it) not far from my house, so I will look for them again and get some more photos. They probably aren't there yet but I can start checking soon because I go there several times a week.

Should I move this from the Orchesella gloriosa page where it is now, or wait?

Feel free ...
to move it already. The Orchesella diagnosis is definitely wrong. One can see some iridisation on the head suggesting the presence of scales. That rules out Orchesella.


Orchesella gloriosa
Note the relative short fourth abdominal segment, typical for members of the subfamily Orchesellinae. The subdivision of the basal antennal segments, typical for Orchesella, is not well visible. In this picture the basal subsegment of the basal antennal segment of the left antenna is just visible.

New for Bugguide. Well done, Joyce!

thanks Frans
for the very quick ID!