Ground Spider - Schizocosa ocreata

Moved

Moved from ID Request.
I'm relying on the brush extending to the basitarsus in distinguishing this from S. crassipes.

… Laura P., 10 May, 2014 - 9:23am

appears to be Schizocosa

male Schizocosa

… wolfpacksved, 8 May, 2014 - 11:43am

Thanks

Now we need to figure out if it is Schizocosa ocreata or crassipes.
It was found in leaf litter at the edge of a bottomland forest.
I will try and get a better picture of the palp later today.

… S Moorman, 8 May, 2014 - 12:15pm

crassipes vs. ocreata

“The main difference between
S. crassipes and S. ocreata must be discerned by the pedi-
palps. The former has a smooth prominence along the
retrolateral side of the paleal process, while the latter has
a rugose or wrinkled prominence.”

“Additions to the List of Schizocosa (Family Lycosidae) for Arkansas”
By Risa Parker and Peggy Rae Dorris
Department of Biology
Henderson State University
http://libinfo.uark.edu/aas/issues/1995v49/v49a26.pdf

… S Moorman, 8 May, 2014 - 12:22pm

Schizocosa ocreata

Leaning towards ocreata because of description of hair tufts on first set of legs-

S.crassipes
“Bristles on tibia of legs I black and dense"
S. ocreata
“Bristles on tibia and metatarsus of legs I black and
dense, bristles often extending to the basal portion of the tarsus “

from:
1997 The Journal of Arachnology 25 :84–9 2

“A NEW SPECIES OF SCHIZOCOSA FROM THE
SOUTHEASTERN USA (ARANEAE, LYCOSIDAE )”
Gail E. Stratton : Department of Biology, Rhodes College
Memphis, Tennessee http://www.americanarachnology.org/JoA_free/JoA_v25_n1/JoA_v25_p84.pdf

… S Moorman, 8 May, 2014 - 12:49pm

i can't say for certain

enjoying the pdf files-- bookmarked!

… wolfpacksved, 8 May, 2014 - 1:02pm

Added a picture of the front leg with tufts but couldn't get a sharper image of the pedipalp- it is just so tiny!

… S Moorman, 8 May, 2014 - 7:28pm

Palp

Is your palp image taken through a dissecting microscope? I found out that dissecting scopes were very useful in getting (somewhat) decent pictures of the palps.

… Chao "Jimmy" Wu, 8 May, 2014 - 8:07pm

No :/

No, I don't have a dissecting microscope, but thanks for the tip!

… S Moorman, 8 May, 2014 - 8:29pm

I actually...

...don't either. I just ask to use the ones within the science classrooms at my school. I'm sure you can ask the biology/entomology department of a local university to see whether you can get access. If you tell them it is for species research I am sure someone will be willing to let you use the scopes.

… Chao "Jimmy" Wu, 8 May, 2014 - 9:10pm