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Arachnology

Spiders and related organisms

This area has continues to be an interest of mine.  I am now receiving several dozen questions concerning spiders in our area and other parts of the state and continent.  Those from outside NY are much harder to ID since I have seldom had a physical sample in had that I could ID with a scope.  There are several sites on line now that have ample images which can allow you to get close to the ID of some spiders.  The following are examples I have found in my garden and back yard.

Opilione are arachnids but are not spiders.  They do not have venom. 

I was able to crop and enlarge one image of an opilione for a closer look at the body.  If you right click the above image and select view image, you will be able to see a larger version of this photo. 

image shows an Opilione

Spider

The spider to the left is in the family Pholcidae.  They have several common names such as daddy long legs and cellar spider.  Besides your cellar, you can find them in out of the way areas in the corners of rooms near the ceiling or near the floor.  They may have clumps of material in the web which is the remains of meals.


This is one of several common species of jumping spiders you can find on campus.

salticid spider common in our area


Peacock Spider Mating Dance

Funnel Web Spiders

The funnel web weaver produces a web sheet with a funnel at one end where it waits for prey to land on the sheet.  It then runs out to retrieve its prey.  The web is not sticky but it can tangle the feet of the prey.  It will then run back into its funnel to consume its prey out of site of predators.  If you tease this spider by touching its web, it will sometimes attack.funnel web spider in petri dish showing general shape and color paternSpider


This is a tiny spider that looks similar to a small ant.  I have only started noticing them in the area since 2015.  My first encounter was near an ant colony.  This one just did not look like the other ants in its movements.  When I took a closer look, I recognized the difference in body structure.  Now in2017, I am finding them in many locations around my home and campus as well as in the greenhouse.  A quick search indicates that there are only 3 species identified in the US at this time.  They are grouped with the jumping spider family.

spider that mimics ant in general morphology


 

Wolf Spiders

Wolf spiders are one of the largest spiders found in Livingston county.  The body can be 3/4 to 1 inch in length. With the legs extended, it could cover close to two inches.  There are several species and not all get to that size.  They are hunters which actively look for food instead of relying on a web.  

The female carries the eggs with her in a silk sphere.  As you can see, it is relatively large compared to the size of the spider. When the eggs hatch, they hitch a ride on the mother for several weeks - probably until the first molt.

SpiderSpiderSpider


Orb spider on web showing large female and small maleThere are two large, colorful orb spiders which can be found in this area. The first one is Argiope trifasciata. Depending on where they place the web, it can be 2 feet or more across. Here you can see a male approaching the female.  I saw 6 males near two female webs during August.  This picture was taken 08/18/10.  A week later, after a heavy rain, all the males were gone.


SpiderThis is Argiope aurantia. I have only seen one of these in my yard in 2008.  Since then, A. trifasciata has dominated with 8 this year, 2010.


Updated 11/14/2017