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Photo#424804
What is going on here? - Pycnoscelus surinamensis

What is going on here? - Pycnoscelus surinamensis
Kendale Lakes, Miami-Dade County, Florida, USA
July 11, 2010
Size: aprox. 15 mm (brown obj)
This morning I went out to look at the garden plantings I had done yesterday and found this little mystery on top of a table on my porch. It looks to me like a roach's abdomen (maybe one of those small roaches one commonly finds when digging around in the soil). What looks to me like a roach nymph was struggling to emerge from it. I have many questions going through my head: Like how did this end up on the table? Did a bird or lizard eat the front half of a pregnant roach? I was pretty sure roaches lay egg cases, could the egg case survive and come to maturity inside the dead abdomen? or is it something else perhaps a parasite or a strange egg case. (although I don't think so) Any thought and comments are welcomed. Don't know if any thing in the pic is actually IDable and once I get some thoughts on the mystery it may be frassed.

Images of this individual: tag all
What is going on here? - Pycnoscelus surinamensis What is going on here? - Pycnoscelus surinamensis

Moved
I am sufficiently convinced that this is a Surinam cockroach that I will move it to the species page. I have not identified any definitive physical characteristic ensuring that the identification is correct, but the live birth is striking enough that, with your geographic location and the general appearance matching, I am convinced. I've also added the image to the species guide page.

By the way, this image is of the ventral abdomen. In female cockroaches the last few ventral segments are fused to form a larger “subgenital plate.”


Moved from ID Request.

not-so-hard labor
quite a few roaches are viviparous; the mom must be in the Polyphagidae -- the newborn, too :)
spectacular series, Livan.

 
Live birth in cockroaches
What an interesting question! Ovoviviparity/viviparity occurs in all members of the family Blaberidae and several genera of Blatellidae. (The only truly viviparous cockroach is apparently Diploptera punctata, but the distinction between viviparity and ovoviparity is merely academic- as both result in the appearance of live birth.) None of these groups are native to Florida, but several species have become well established, such as the Surinam cockroach. I would guess this as the species, but will see if I can find any more definitive characters listed for the abdomen of females.

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