Two Flies Sharing a Meal

July 4th, 2011 - 9:43 AM | Filed under Featured Photos | 2 Comments

January 21, 2011 | Finca La Isla, Limon Province, Costa Rica

These two flies are sharing a meal.

I can easily identify the larger one as a micropezid.

Micropezid

I’m not sure about the smaller one though.

Smaller fly

Another Micropezid

July 2nd, 2011 - 7:22 AM | Filed under Featured Photos | 2 Comments

13mm (body) | January 21, 2011 | Finca La Isla, Limon Province, Costa Rica

Here’s another micropezid, waving its front legs like they are apt to do.

Frontal view

Another Micropezid

June 20th, 2011 - 7:26 PM | Filed under Featured Photos | 1 Comment

January 21, 2011 | Finca La Isla, Limon Province, Costa Rica

This one looks a lot like the one I found ovipositing.

Micropezid, ovipositing

April 30th, 2011 - 10:27 AM | Filed under Easter Eggs, Featured Photos | 3 Comments

8mm | January 19, 2011 | Armonia Nature Preserve, Limon Province, Costa Rica

While recently reviewing my shots of this fly in the family Micropezidae, I was surprised to find that I unknowingly got a shot of her laying an egg. Here’s another shot for comparison, where she has concealed her ovipositor beneath her abdomen.

Ovipositor concealed

Here’s a crop from the first photo, showing the ovipositor and the egg.

Ovipositor and egg

Everything I’ve read indicates that most larvae develop in decomposing matter, so it seems strange she would be placing an egg on a leaf surface. Perhaps this is  just a method of random distribution, and the egg just falls where it may on the ground below.

I saw lots of micropezids, also called stilt-legged flies, during my stay. They are fairly easy to recognize with their long legs and curious behavior. I usually see them on leaf surfaces like this, walking around and waving their forelegs in front of them like antennae. This behavior combined with their overall form gives them the appearance of an ant or a wasp perhaps.

Frontal view