For the identification of insects and other fauna and flora of South Africa.
Showing posts with label spider identification. Show all posts
Showing posts with label spider identification. Show all posts

Sunday, December 4, 2011

Tropical Tent Web Spider (Cyrtophora citricola) family Araneidae

This female has made a huge web and in the middle are her egg sacks. She is about ½ and inch in length. The pictures are very difficult to get as they are all taken through the thick web which I could not coax her out of. The almost square abdomen and no-legs look made me think it looks like a beetle which I am sure it tries to imitate.







Sunday, April 17, 2011

Spider and moth - Hairy Field Spider (Neoscona blondeli) Araneidae

This beautiful spider had just caught the moth and had started to spin a web around it so that it could not fly off. During the course of my browsing around trying to find out more about spider eating habits, I came across this article published in 2008 by Patricia A. Michaels and thought it might be of interest. What do spiders eat Spiders, long considered carnivores, (although there might be exceptions to that rule), traditionally choose insects and other arachnids as their primary source of food. Arachnologists, scientists who study spiders, have long been intrigued by spider diets. One question they consider, "Are Spiders Picky Eaters", has been the subject of both observation and scientific experimentation. Like all scientists, when arachnologists conduct experiments on spider diets, they are trying to stay as objective as possible with respect to the potential answers. Objectivity in scientific experimentation often loosely translates into scientists trying to prove their thinking is wrong, rather than prove their thinking is correct. Scientifically, the process is known as testing the null hypothesis. A pair of arachnologists conducting experiments on the pickiness of spider eating habits, started with the hypothesis that spiders eat any insects that come their way. They conducted an experiment with an Araneidae species, an orb weaving spider (Micrathena Gracilis). Over an extended period of time, they counted the number and size of insects that flew into the web. They also recorded the number and size of the insects that the spider captured for dinner. Testing the null hypothesis meant that the researchers thought that the spider would eat all the insects that landed in the web, regardless of insect size. At the end of their experiment, they concluded that when given the choice between large and small insects caught in the web, the spider preferred larger insects. In scientific terms, they concluded there was a statistically significant relationship between spider diet and insect size. The hypothesis that spiders are picky eaters still stands. Information supplied by: http://greennature.com/article120.html

Monday, May 10, 2010

Spider and egg - Sheet Web Pisaurid Spider (Euprosthenops sp) Pisauridae

Going down to see one of the waterfalls with Gaelyn, We came across this small spider with its egg.
It is fairly small, probably less than 1/2" in diameter but it was very protective.
The egg would probably hold a 100 or so babies in it.

Wednesday, February 17, 2010

Black / Brown Widow (Button) Spider

Here is, for me, an interesting one on the Brown Widow (also known as Button spiders) Spider. This young lady made her nest in the gate at the office and I managed to get a few nice shots of her. What we discovered was that there are two varieties, the Black and the Brown Widow Spider. Of these two, the Brown Widow, pictured here, is the more dangerous of the two. But she is tiny, only about 4mm (less than half an inch) in diameter. Some of the species are very colorful and are not only black as I had previously thought.
Markings on the back....
and on the stomach.

Friday, October 9, 2009

Common Rain Spider (Palystes superciliosus) Sparassidae

I found this smallish Wolf Spider which had unfortunatley fallen into a drain full of Jeyes Fluid and the poor things was dying. I would like to have one as a pet but I so seldom find any. He was about 2-3 inches in length.
The Lycosidae or wolf spiders, as they are commonly called, are often seen dashing from under the grass trying to escape the lawn mower or doing freestyle in the pool. The family name and common name are derived from the Greek word "lycosa" meaning "wolf" due to the spiders' hunting method of ambushing and running down its prey. Research has shown that the Lycosidae are important in agriculture, as they are efficient controlling agents of insect pests. They are harmless to man.
Lycosids are often parasitised by wasps probably because they are free roaming and do not enjoy the protection of a web. The wasps will parasitise them in one of two ways. Depending on the wasp species, the spider will either be stung and immobilized, stocked into a prepared nest, have an egg laid on it and then sealed into the nest, there may be one or . The wasp larva then hatches and consumes its live prey that eventually dies as the larva pupates. Secondly, a female wasp will immobilize the spider and lay the egg directly onto it. The spider continues living a normal life with the wasp larva feeding on it until the spider becomes too weak and dies. This coincides with the maturation of the wasp larva that then pupates later to emerge as the adult wasp.

Thursday, August 27, 2009

Arboreal Huntsman Spider Olios correvoni Sparassidae

There is a very big avocado tree outside my door and over the weekend they were trimming some of the branches off.
I think he must have crawled off one of the cut-off branches as I found him on the paving.
He is very fast and scuttled away whenever I got the camera near, so I let him crawl onto my finger and put him in my tank to take pics.
He is tiny with a body length of less than half an inch but extremely hairy as you can see.

Friday, April 3, 2009

Food storage - False Button Spider (Theridion delicatum) Theridiidae

Over the weekend I was sorting out some old papers which were in a blue plastic trunk and when I took it outside to clean and turned it over I found this.......
Sitting nearby was a tiny False Button Spider........

I am not sure what these are but look like it might be crickets about to hatch.
and I am sure that this was her food supply for her babies when the are born.
I did a previous article on them, please click here to see it and read more on this interesting spider: Black / Brown Widow Spider

Monday, December 22, 2008