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unknown fly - Drosophila immigrans - female

unknown fly - Drosophila immigrans - Female
Aromas, San Benito County, California, USA
October 15, 2007
Size: ~5mm.
Yes, it's yet one more fly from our potato plants near the compost bin (live oak/chaparral habitat).

Images of this individual: tag all
unknown fly - Drosophila immigrans - female unknown fly - Drosophila immigrans - female

Drosophila immigrans - female
Fifteen years ago, I had begun to rear this species, one of the commonest "big" Drosophila in Europe, on yeast-based artificial medium in glass jars. I had soon to give up because the flies thrived so well that I could not manage such an explosive growth.
From this bad experience, I have kept in mind the typical color pattern of this cosmopolitan species. That's why I recognized it as soon as I saw this female on your both pics.

Thank you Richard
Wow, and here I thought I was going to have to be content with ID to genus only. Thank you.

Same species??
I suspect the other flies I submitted earlier are the same species.

I suspect it too...
But this is difficult to prove conclusively from this angle.

sure looks like Drosophila
I'd like to know if anyone thinks this is something other than Drosophila melanogaster (or some other Drosophila sp). I used to work in a genetics lab with them, but since I only worked with D. melanogaster I do not know about other flies. This looks just like our "wild type" (standard) stock. This is a very "ripe" female, who will be laying lots of eggs soon. You can see an egg next to her right middle leg - the eggs look like tiny grains of rice.

Thanks joot
Your ID makes sense, it was right next to the compost bin which is swarming with little "fruit flies", and now that I look at , it certainly looks similar to me.

hah-- umm...
Actually you made me wonder even more, because the thumb you posted is not a Drosophila, but is in the Lauxaniidae family. However, that one looks quite different to me... longer abdomen, longer wings, more hairs, and it doesn't have the "wild type" coloring.

Thanks joot
Yeah, I got in too much of a hurry, didn't notice that that posting was placed in the Lauxaniidae, just saw the D. melanogaster name on the posting. Looks like BugGuide has only one image of D. melanogaster . And the upper fly in this last image does look much like my image.

oh my
I gather from some browsing that Drosophila is a rather huge genus. Check out this site. I bet the pictures in the guide are left at the genus level because it's so difficult to narrow it down from there. Hmph maybe I should stick to H*eteroptera.

I guess I should be happy with ID to genus. Thanks for pointing out that site, I've bookmarked it for future reference.

Drosophila Species
I have done research in the tropics with Drosophilidae and I would conservatively predict the number of species to be over 4000. Another great site is

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