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DavidRS

East L.A. Trapdoor, Ése

This was collected near Cal State Los Angeles. I'm trying to get a location, but the collector is not giving any information. I'm going to up my bribe to get get more info.




cacoseraph

i should be able to see the pictures later today and maybe can guess.  What is probably your best bet, though


or you can try to do some figguring on your own... let me grab a state table that might help you


dude! idea!  we need to start going through the pics we have onteh forum to make an "illustrated" guide to the state table!  heck yeah!




cacoseraph wrote:
(please note that this is put together from a bunch of different sources from a bunch of different years and should in no way be taken as absolutely correct)
How To Distinguish Between The North American Familes:

Atypidae
Antrodiaetidae
Mecicobothriidae
Dipluridae
Cyrtaucheniidae
Ctenizidae
Nemesiidae
Barychelidae
Theraphosidae


In theory, once each Family has a different set of characteristics we have can make a key to Family Very Happy
Also, I am trying to find only naked eye morphological characteristics to make this as useful as possible in the field

a) 11 SCOPULATE (adult(?) females are scopulate on tarsi I-II) (0=no taxa member is scopulate, 1=some members are scopulate, 2=all members are scopulate)
b) 8 THORACIC FOVEA (0=open pit (sometimes longitudinal), 1=transverse, 2=very wide, 3=closed and longitudinal)
c) 12 CLAW TUFTS (0=absent, 1=present, 2=both states in taxa)
d) 16 CAPUT (0=low, 1=elevated)
e) 17 RASTELLUM (0=absent, 1=present, 2=both states in taxa)
f) 18 LEG SIZE DIFFERS(0=anterior and posterior legs approximately same size/length, 1=anterior legs shorter and more slender than posterior)
Code:

TAXA a) b) c) d) e) f)
Atyp 0  0  0  1  0  1
Antr 0  3  0  1  1* 0
Meci 0  0  0  0  0  0
Dipl 1? 1* 2  0* 0* 0
Cyrt 1  2* 0* 1* 1* 1
Cten 0? 2* 0* 1* 1  1*
Neme 1  1* 0* 0* 2  0*
Bary 1  1  1  0  0  0
Ther 2? 1  1* 0* 0* 0*
(*=not sure if this is the state for the whole taxa)
(the numbers after the character identifier is the character number from Goloboff)




(most information taken from Goloboff (1993) (9MB download))
What

David, set that up in a small deli surrounded by damp paper towels. It is super dehydrated.

Also, for a trapdoor of that size there are two things it could be, B. californicum or H. theveneti. If you grab a good picture of leg IV's tarsus it should be easy to ID.
josh_r

What wrote:
David, set that up in a small deli surrounded by damp paper towels. It is super dehydrated.

Also, for a trapdoor of that size there are two things it could be, B. californicum or H. theveneti. If you grab a good picture of leg IV's tarsus it should be easy to ID.


yes, that spider is very dehydrated. i would do as what said and let it chill for a couple days before messing with it.

what, i am curious to know the difference between B. californicum and H. theveneti. do they have similar ranges and habitat preferences???

-josh
josh_r

cacoseraph wrote:


dude! idea!  we need to start going through the pics we have onteh forum to make an "illustrated" guide to the state table!  heck yeah!






hey caco, that is a very good idea. i will be able to contribute photos after my trip at the end of this month. should have some very cool stuff. hopefully many species of aliatypus, calisoga theveneti, uroctonus grahami (cave scorpion) and a few other very cool inverts.

looks as i will not make it to san jacinto this comming weekend. my girlfriends birthday is that same weekend. so we will have to reschedule.

-josh
What

josh_r wrote:

what, i am curious to know the difference between B. californicum and H. theveneti. do they have similar ranges and habitat preferences???

-josh

Unfortunately I have not found a trap that I can confirm as H. theventi but, afaik the only taxonomic difference is B. californicum has a large dense patch of spines on leg IV's tarsus, and H. theveneti does not.

Spiders of North America: An Identification Manual Spiders of North America: An Identification Manual wrote:
http://i26.tinypic.com/16lxqmh.jpg
TheJackal

That is pretty cool david












-glad to be back online at last!  Wink

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