Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
Clickable Guide
Moths Butterflies Flies Caterpillars Flies Dragonflies Flies Mantids Cockroaches Bees and Wasps Walkingsticks Earwigs Ants Termites Hoppers and Kin Hoppers and Kin Beetles True Bugs Fleas Grasshoppers and Kin Ticks Spiders Scorpions Centipedes Millipedes

Upcoming Events

Photos of insects and people from the 2015 gathering in Wisconsin, July 10-12

Photos of insects and people from the 2014 gathering in Virginia, June 4-7.

Photos of insects and people from the 2013 gathering in Arizona, July 25-28

Photos of insects and people from the 2012 gathering in Alabama

Photos of insects and people from the 2011 gathering in Iowa

Photos from the 2010 Workshop in Grinnell, Iowa

Photos from the 2009 gathering in Washington

unknown shiny black thorn backed spider

unknown shiny black thorn backed spider
Davie, Broward County, Florida, USA
May 20, 2011
very tiny...on my tomato plant

Moved from Spiders.

Coleosoma acutiventer
I think it's a Coleosoma acutiventer. Not sure which gender (the immature males look just like the females). I'd lean towards it being female, though, since there's a bulge in the area where the epigyne would be.
I just filled in some stuff on the genus page with links out to all the PDFs that have info on the 4 species. C. acutiventer and C. blandum are the only two choices for this one with the pointed abdomen... and since the abdomen is all black (no white patch on the side), I think it's acutiventer.

Coleosoma acutiventer
The description certainly matches. The only thing that doesn't match is the side view drawing of the female. In that Levi PDF image 6 on pg. 11? it shows the female having the abdomen projection pointing horizontally, even a little down instead of the upward projection seen in the spider above.

I have a copy of Levi 1972 that shows some Chrysso females with the projection pointing up, but none of them appear to be black.

shiny black pointed spider
Moved from ID Request.

It reminds me of Cyclosa. It's a great find. I'll have to do more research before making a final guess.

thanks...i hope you can find out...i've tried searching here & through google...i gave you think this is a baby & will change color?

looks mature
or nearly mature to me. I can see the palps are fairly well developed. That being said there are male spider that change drastically in their final molt.

Comment viewing options
Select your preferred way to display the comments and click 'Save settings' to activate your changes.