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This
started as a place to collect spider pictures as I moved them from the
RICKUBISCAM. As I got more pictures of spiders, I started putting them
here. Over time, I got
enough of them to be able to split off separate
pages. The links to the other pages are above. To get the most information,
it might be best to browse them in order. I
recommend a book I've bought
to anyone who is interested in spiders (maybe I'd recommmend it to people
who aren't interested in spiders. The title is:
Biology of Spiders,
by Rainer F. Foelix, published in 1996. This has a lot of information on
spider biology. It is not an identification guide, but is filled with detail
on how
spiders do what they do(Since they're "spiders" do they "spide"?
Is what spiders do called "spiding"? Probably not. It's just another mystery
of the English language.).
In fact, if you read the book, I'd be surprised
if you didn't develop an interest in spiders.
August 22 and 29, 2010
While I was looking through the gardens at the Nature Center (looking for
Praying Mantids), I discovered a pair of large Green Lynx Spiders (Peucetia
Viridans).
I took some pictures of them and then continued my mantis search.
Male spiders often have the ends of the pedipalps (the "short" pair legs
in front of the jaws) enlarged, so I think one was
female and one was male.
The top set of pictures is from August 22nd.
----------------------
MALE
AND FEMALE ON OPPOSITE LEAVES
FEMALE WITH QUARTER
MALE WITH QUARTER
The
next week, I found them again.The pictures below are from August 29th.
Then, someone else told me where another one in the next garden had caught
a bee. So, more pictures. As I
mention on in an older post on this
page these spiders have been observed "spraying their venom from their
fangs" when the spider is stressed--such as by pulling a leg with tweezers.
The
Green Lynx will turn towards the annoyance and spray. I'm curious about
how
this "spray" works. Does it increase fluid pressure until the venom is
forced out from the fang openings? What??
I'll repeat the link I put on
the other page here--to one report. Click
here for the pdf. I've also found another reference (with
a few picture showing spray patterns on glass) on page 27 in this book:
Secret Weapons--Defenses of Insects, Spiders, Scorpions, and Other Many
Legged Creatures by Eisner, Eisner, and Siegler (C)2005 I'll see
if I can investigate this further by watching the spiders.
As I posted
somewhere else recently--if some giant pulled one of my legs, then I'd
spray, too....just not from my fangs.
-------
GREEN
LYNX WITH CAPTURED BEE
GREEN LYNX WITH CAPTURED BEE CLOSER
GREEN LYNX PEEKING UNDER A LEAF
October
06, 2002The
image below left (NOT A GOOD DAY. below) is just our tarantula in the Nature
Center enjoying a meal. I guess there are a few lessons here: ONE,
that no matter how bad
your day is, it would be far worse if you were being
eaten by a spider and TWO, that a meal can be a cause of great satisfaction
*and* great dissatisfaction, depending on which side of the jaws you're
on.
-------
-------------------------------------
NOT A GOOD DAY?
September
08, 2002The
picture below(GREEN LYNX) shows a "Green Lynx Spider" (Peucetia viridens),
with a quarter. For those who haven't figured it out, the various coinage
that appears in my nature
pictures is for scale, and NOT because I have
to pay any of these animals to pose, and not because they need the money.
The
Green Lynx Spider doesn't make a web to live in (like the various orb weavers
do), but instead it likes to skulk about in vegetation, pouncing out on
any prey that might happen by. As I was searching the
internet for
information on this spider, I discovered an interesting fact. These spiders
spit poison! (Oh, no...not another venom-spitting arthropod!) Click here
to see a .pdf file that gives this information. The
spitting in this species
appears to be a defensive behavior. There is another spider that spits
a mixture of poison and sticky glue to catch prey (family Scytodidae,genus
Scytodes), by actually squeezing its
prosoma (cephalothorax) using internal
muscle contraction and squirting out this mixture in a zigzag pattern that
sticks its prey to the ground and paralyzes it. However, the Green
Lynx spider apparently only
spits venom when attacked. (Note--In
studies that I've found since I wrote this, and direct communication with
Dr. R.B. Suter; there is increasing evidence that there is no toxic component
in the "spit" of
scytodes. It
has been shown that the spit can actually contract so that besides gluing
down the target organism there is also a tightening effect. This could
cause the limbs of the prey to contract and give the
illusion that the
prey was "curling up" and dying. Look for these studies online:
Spitting performance parameters and their
biomechanical implications in the spitting spider, Scytodes thoracica.
Suter RB,
Stratton GE and Clements R, Li D. 2005. Regulation and
non-toxicity of the spit from the pale spitting spider Scytodes pallida
R. Dashnau 09/02/2010 Try this link for the first
study.
----
GREEN LYNX
THE USUAL LEVEL
MORNING AFTER FAY
Some
of you may be aware that tropical storm Fay briefly threatened my home.
While there was some flooding of nearby areas, it was not as bad as the
damage that Allison wrought last year. A friend of
mine happened
to live in Galveston, though, and she got to watch as the water steadily
got higher Friday night. I went out there Saturday, and the water
was still a bit higher than usual. The two pictures above
show the change.
THE USUAL LEVEL was taken last November. The MORNING AFTER FAY was taken
at about 10:30 am Saturday, Sept. 7th. The rest of the day was excellent.
September
4, 2002 Last Monday, Labor Day, I was
at the park, doing park things, when John drove up in one of the gators.
He told me about a large spider that he saw inside one of the water stations
on the
Spillway trail. Not long after that, Herb mentioned the same spider.
So, I
stopped by this water station, and looked inside. I did't see any
spider, and started to stick my head in, but then decided I might not like
a large, annoyed spider of indeterminate species jumping down
onto
the back of my neck. So, I carefully looked again, and then I found it.
With a little maneuvering I was able to get some pictures. One is below.
----------------------------------------------------
I suspected that this was another spider of the Dolomedes genus. So, I decided to ask the "high priestess of Dolomedes", Ms. Kelly Kissane.
Here
is part of my email to her:
....Here's my story. Yesterday, two people told me about this "big spider"
that was hiding in our little water station.
They knew I like to take pictures of them. So, I looked, and found it hiding
up against the ceiling. The picture with it
against the end of the board shows where I found it. That wood is about
1-3/8 inches to a side. I blew on the spider,
and it moved onto the wall, allowing me to get the other shot. I'm
reluctant to bother the animals too much, so that's
all I did. I was lucky to get the shots I did, considering I had to reach
inside the box while
holding the camera.
Am I right in guessing that this is a Dolomedes Tenebrosus? The body shape
and the "frowning face" eye
arrangement seems similar to our other friend's (D. Albineus). Also, that
pattern on the rear segment
(abdomen/opisthosoma) seems like what I can see in the guidebook. Since
I think it's a Dolomedes, I figured
you'd be the person to ask....
And here is her answer:
Rick,
That's definitely Dolomedes tenebrosus - a large female. The males
are less than 1/2 that size
(sometimes they're 1/4 the size of the female)....
Kelly
So, there's the story. I've been fortunate (some may not agree) to be able to see two different spiders in the genus Dolomedes.
August
18, 2002 I went to check on my Alligator
Gar's head. This is the same large gar that I've mentioned before. I'm
trying once again to clear the remaining decaying matter off of it. This
time, I'm using a
steel mesh cage that I made, and I placed this on an
ant's nest. I'd picked up the head, and inspected it, and when I
set it back down, I saw a large spider on top of the skull. At this point,
I think it's some type
of wolf spider, but I'll see if I can identify it.
Both pictures show the spider standing on the gar's skull. (see Wolf1 and
Wolf2, below. Wolf2 is pictured with a quarter.)
WOLF
1
WOLF 2
According
to my Audubon Society Field Guide to North American Insects and Spiders,
this is a wolf spider. Specifically, it's known as a Rabid Wolf
Spider (isn't that a nice name?), Lycosa Rabida. When
I searched
the internet, I found that this species has been renamed Rabidosa Rabida.
At
this point, I don't know much about spider classification, and for now
I'm putting the Latin names for animals on my
pages for both readers' and
my education. It will be a long time before I can remember all these names.
The key identification point seems to be the two lengthwise dark stripes
on the front section
(cephalothorax, sometimes called the "prosoma" on
spiders), and the dark stripe between two pale stripes on the abdomen (also
called the "opisthosoma" on spiders). The two main body parts are
joined
by a thin joint called the "pedicel" (Source for body part names:
Biology of Spiders-2nd edition, by Rainer F. Foelix.) Click the image
below to see these parts labeled on a real spider.
-------------------------------------------------------------
July
21-20, 2002 I guess we're moving into
our summer weather, although it hasn't broken 100 degrees F yet. The number
of visitors to the park has lessened somewhat. Today, July 21(Sunday),
I took a
few more pictures of some of our Golden Silk Spiders. This picture
shows a pretty big one (see HOW BIG?, above). I took two more pictures
of this one, with different objects to give a better idea of the
size.
(See CATCH MY NAME, and WITH A QUARTER above). These spiders are usually
harmless to humans, but it still gave me some heebie-jeebies to look through
the camera zoomed in as I moved
my hand closer to the spider. I'll
mention here that Ms. Kissane, in our early communication, pointed out
the there is a very poisonous, and aggressive spider from South America
also known as "Banana
Spider", because it has turned up in shipments of
bananas here in the U.S. Please don't start killing the spiders I've shown
here under the impression that these "Banana Spiders" are the same. They
aren't.
If you'd like to know more about the park follow these links:
Brazos Bend State Park The main page.
Brazos Bend State Park Volunteer's Page The volunteer's main page.
Click on this image to see a flv video movie (942kb) of a series of 9 11 x 14 posters I'm working on.
If you'd like to know more about spiders (besides what I have on my
pages), then go visit the:
THE ARACHNOLOGY HOME
PAGE
The Arachnological
Hub of the World Wide Web
There, you will find about 2000 more links to information on spiders on
the internet.
The webmaster there was kind enough to place a link to this page
there. The link to me is on this
page.
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