Brazil Bugs #10 – A mosca mais legal que eu já vi!

Nerius sp. (Diptera: Neriidae) - Campinas, São Paulo state, Brazil. ID by Fernando Carvalho-Filho.

I found this bizarre-looking fly outside of Campinas, Brazil (on the same tree as the Aetalion reticulatum that I showed earlier).  There were a few of them, and although they weren’t especially flighty they did have the annoying habit of constantly moving to the backside of whatever branch I tried to photograph them sitting on.  The tree (a small one with green, flexible wood and short, stout spines along the branches) was hanging on the edge of a hillside itself, so a period of careful branch-bending and precarious body-contortioning was required before I finally got one of the flies suitably placed within the viewfinder.  At the start and before all of my disturbance, they were perched head-downward and outward on the more vertically-oriented branches.

This fly is unlike any I’ve ever seen (or at least noticed), and I really had no clue to the family (or even superfamily).   I wish I could be happy just posting photos of interesting, though unidentified insects and be done with it, but something inside me doesn’t get much enjoyment out of that – I’m compelled to at least attempt an identification.  For my recent Brazilian exploits, I’ve found Flickr to be a useful tool in the identification arsenal – enter a search phrase such as “Brasil Diptera” and scan the results for any possible matches.  I don’t remember which particular phrase finally brought up a hit, but eventually I was clued into marsh flies of the family Sciomyzidae.  Another search for all Flickr photos tagged as such brought up several pages of more or less similar looking flies, including more than a few that were indeed very close matches.  My work seemed to be done.

Still, something about Sciomyzidae bothered me.  We’ve got sciomyzids here in the Midwest, and while there is certainly a resemblance, the overall gestalt of this and the similar appearing Flickr-ID’d flies just didn’t seem right.  So I opened up a broader search on Google images looking for more authoritative confirmation of the ID.  Eventually, I happened upon this photo by Brazilian photographer Enio Branco of a fly that, for all intents and purposes, looks exactly like mine.  The fly in that photo had been assigned to the family Neriidae (cactus flies), and further searching for information on the family in South America quickly turned up a recent faunal treatment of the family in the Brazilian Amazon (Carvalho-Filho and Esposito 2008).  According to that work, these distinctive flies can be distinguished from nearly all other acalyptrate flies by the antennal arista being situated apically on the postpedicel (third segment).  This character is readily visible on the fly in this photo and also on the similar appearing and apparently misidentified flies in the Flickr photos.¹  I figured I’d give the Amazonas key a go to see if an ID might be possible, but I immediately ran into trouble at the first couplet trying to decide if the antennal pedicel was elongate (Odontoloxozus peruanus), or if not whether the forecoxae were dark brown (Glyphidops spp.) or yellow (Nerius spp.) – they look light brown to me!  It’s entirely possible that this fly, photographed in southeastern Brazil, represents a species (or even genus) not included in the Amazonas key – hopefully one of the dipterophiles out there will be able to provide some insight.

¹ This could be an example of how one misidentified photo can create a growing pool of misidentified photos.  It serves to caution against accepting apparently solid IDs from open sources too quickly.

The most interesting feature of this fly (IMO) are the elongate head and legs with spinose forefemora.  Although appearing raptorial in design, apparently the males of this family engage in rather spectacular sexual combat, rearing up on their hind legs and striking each other with their forelegs or the ventral surfaces of their heads, even attempting to place each other in a head-lock.  I regret that I didn’t get the chance to witness such behavior.

Photo Details: Canon 50D w/ MP-E 65mm 1-5X macro lens (ISO 100, 1/200 sec, f/13), Canon MT-24EX flash w/ DIY oversized concave diffuser. Typical post-processing (levels, minor cropping, unsharp mask).

Update 02/07/11: I just received the following message from Fernando Carvalho-Filho, lead author of the Amazonas paper referenced above. Dr. Carvalho-Filho was kind enough to reply to my query regarding the identity of this fly as follows:

Dear Dr. Ted,

Thanks for the message. Congratulations, your photo is marvelous! Great macro. The best photo of a Neriidae that I have seen. Your webpage is very cool and has good pictures. In my opinion, the fly is a Nerius. It is difficult to determine the species, since they are separated based on the thorax color pattern.


My appreciation to Dr. Carhalho-Filho for his identification.


Carvalho-Filho, F. S. and M. C. Esposito.  2008.  Neriidae (Diptera: Schizophora) of the Brazilian Amazon: New records of genera and species, and key to species. Neotropical Entomology 37(1):58–62.

p.s. An early 2-pt lead in the new BitB Challenge series to whoever provides the most correct translation of the title – your prize for making it through the whole post!

Copyright © Ted C. MacRae 2011

19 thoughts on “Brazil Bugs #10 – A mosca mais legal que eu já vi!

  1. Ha! I have one of these in amongst my photos from Vanuatu, which I’d been calling the “little stalk legged fly with the funny head” up until now! I hadn’t spent as much time digging (or have as much skill) as you, so had only got as far as feeling it didn’t quite fit with the ‘feel’ of the sciomyzids I’ve seen about the place. Sure enough, the antennal arista is sitting right on the top of the antennae, so I’ll know what to call it.

    Desperate as I am to enter the next BitB challenge, I’m not even going to try an apply my highschool French into translating that Portuguese.

        • If you’re talking about mine, though it might look like Teleostylinus, as far as I can tell that genus is restricted to the Oriental and Australian Regions and the Pacific islands. The three genera I mention in the text seem to be the only ones found in Brazil (or all of South America for that matter).

  2. Translation: A pun depending on whether you put in the quotes or not:

    “The ‘Coolest Thing I’ve Ever Seen’ Fly” (new common name for the fly)
    “The coolest thing I’ve ever seen fly! (as opposed to the coolest thing I’ve ever seen walking)

  3. I’ve never seen one of these personally, though I’ve seen photos of cactus flies. That was my first thought when I saw it.

    Now I’ll have to figure out the appropriate Costa Rican Spanish way to say your title for when I post the coolest fly I’ve ever seen that happened while I was there last month.

  4. Tim: The pun doesn’t quit work, since “mosca” can’t be a verb.
    Your second meaning would be something like the following in Portuguese (with “thing” changed to “critter”, since it’s a living thing) : “o mais legal bichinho que eu vi voar” .

    Now here’s a groaningly punny response: Não deve ser legal ver tal coisa!

    (Unlike so many slang terms that come and go, “legal” as a slang term for cool, great, awesome has had good longevity in Brazil – not quite rivalling, but approaching that of cool in the US. It has been in common and constant use since well before I learned Portuguese back in the 1980s.)

  5. What a cool fly. Unusual indeed. That’s a good shot considering the circumstances.

    And I’m right there with you on wanting to identify stuff I see/photograph. Sometimes I can drive myself insane trying to put a name on something very unusual, but by golly I’m gonna give it my best shot. To make matters worse, I keep a list of anything I’ve posted that wasn’t identified because eventually I want to know what the heck it is.

  6. Well, I take Latin, and that means I should be decipher any Romance language that happens upon my lair!

    Now what’s this, Portuguese? Errrrr…

  7. Now this is what I like to see, not only flies, but Nerioids (or Micropezoids depending on your point of view :D)! Great shot Ted, and glad to see all the Diptera came out to give you a warm Brazilian welcome.


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