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Hello,

I know this is such a difficult ID, especially on photos, but I'd like to have some more informations about the way we can at least precise the family. (7 mm - Saint Apollinaire (21), France - 15th August 2004)

Please tell me whenever I'm wrong : ;)



We don't see any post-scutellum, so it is not a Tachinidae.
So it should be either Calliphoridae, or Muscidae.




Photos don't allow to see whether there are hypopleural setae or not, which could discriminate the 2 families. :(

Is there any other visible criteria that can help making the difference ?
In case there is, then, how to go further in identification ?

Thanks for explanations !

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Bonjour Benoit,

This is a species of Lucilia and there is little chance that we can ever say which one, unless I am very much mistaken. Similar Muscidae and Tachinidae would have a different wing venation and Tachinidae also would be much more setose on the abdomen.

Paul

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Postscutellum chez Tachinidae d'o? l'int?r?t de la photographie 3/4 arri?re!

Scutellum en deux assises superpos?es!

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Yes, of course, but that's what I'd like to know : which are these venation differences ?

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Je m'excuse!

Anthomyiidae: Medial vein not curving forwards.
Muscidae: Medial vein curving forwards in a limited number of genera. Of these, only Neomyia is metallic green, but its species are really shining and without fine dust layer (and generally the antennae are held to the face rather than projecting).
Tachinidae: As far as I know there are only two genera that can be mteallic green, Chrysosomopsis and Gymnocheta and in these species the medial vein almost closes the cell anterior of it and the abdomen is strongly setose.

Hope this helps.

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Good to have some "strong" criterias at least for the family, when I face so common metallic green flies ! Thanks for the explanations, Paul. B)

I have 2 questions left :

- Are Neomyia and Orthellia synonyms ? (That's what I understood for books, but I'm not sure :|)

- For Calliphoridae, is medial vein always curving ?

Best regards !

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Answer to both questions is: Yes.

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So, if I right understood all your explanations (?), this other specimen should be... ...some Calliphoridae too... (not so original... :|)

Let's suppose another Lucilia sp ?




Thanks !

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Another species? Maybe yes, maybe no. First, the top one is a male (eye close-set) and the bottom one is a female (eyes widely separated). Second, there is a considereable variety in the colouration of species. They are all metallic green with many variations in lustre, either with bluish or purplish shine, etc. Robineau-Desvoidy almost made a living out describing all colour varieties as new species. In the Catalogue of Palaearctic Diptera some species have more than two pages of synonyms, all described by Robineau-Desvoidy from "l'environs de Paris"... :o

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OK, thanks.
With "another Lucilia sp", I meant "one more Lucilia", not "another species of Lucilia" ;)
I'm glad not to have mistaken the family, ...even if it may appear obvious to you ! :)

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I always assume to much, ask my colleagues... B) (Right, Gerard?)


Luckily there are not so many metallic green calyptrate flies. That makes our life a little easier.

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So, let's get more complicated...

What about metallic green flies when the medial vein is not curving ?... :o

- Are there only Anthomyiidae and Muscidae, or are there other families too ?
- Are there "easy" (:p) criterias to distinguish families ?


Thanks for you patient explanations, Paul !
I do agree with cthirion : you're really precious to us ! ;)

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(this is my first post here, but I have lurked for a while)
Not easy to say what species this is just from the pictures, but lets try anyway :)

You can rule out a few species, even if all the characters are not visible: the specimen has 3 post acr (postsutural acrostichial setae), and you can rule out ampullacea, caesar, illustris and bufonaria, as these all have 2 post acr.

Also, the first flagellomere is about 4 times longer than wide.. Using this criteria alone, you can then rule out L. richardsi, L. regalis, L. ampullacea, L. bufonaria, L. caesar, L. magnicornis, and L. illustris.

Combining these two characters alone, we have ruled out quite a lot of species. Among those not ruled out is Lucilia sericata and Lucilia silvarum.

Now, the width of the frontal vitta of female L. silvarum is definetly less than 2 times the width of the fronto-orbital plates, but about 2 times the width in L. sericata. Measuring the frontal vitta and the fronto-orbital plates at the image, we see that the frontal vitta is 2 times the width of the fronto-orbital plate.

Based on the above, I would say it is most likely that the above female is a specimen of Lucilia sericata. To be absolutely sure however, I would have had to have the specimen in front of me.

Now I'll take a closer look at the male...maybe I can come closer to what that is as well.

It is a bit more difficult to establish the chaetotaxy of the male, but I think it has only 2 post acr. It is not that easy to get a correct value of the length vs width of the first flagellomere, but it seems to be somewhere between 3.5 and 4.2 longer than wide.

The 2 post acr excludes sericata, regalis, richardsi and magnicornis, and silvarum, but includes bufonaria, caesar, illustris and ampullacea.

I can't get any further than that with these images, I am afraid.

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It is my experience that L. sericata breeds a lot in garbage. This species and Calliphora vicina are conspicuously present in urban environments. Are other, similar-looking species also common in (European) urban environments?

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Well, both Lucilia caesar and Lucilia illustris can be found in urban enviroment, but they are not as strongly synanthropic as Lucilia sericata, except in the northern parts of their range, where they are wholly dependent on man.

Protophormia terraenovae is another species that is somewhat associated with man in Europe. Together with Calliphora vicina, it is probable the species I most often encounter in forensic entomology cases here in Norway.

Protophormia terraenovae is pretty common on refuse dumps in southern Norway.

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Speaking of urban environments,- in Lithuania Lucilia caesar and Calliphora vicina are most common synantropic Calliphoridae flies. I've also found Protophormia terraenovae on carrion as well as several species of Muscina (Muscidae) :)