Eyes can be arranged differently in different species. Sometimes one pair is better developed than the rest. Some species have a pair less or are even without eyes. While several families of hunting spiders have good to excellent vision (Lycosidae and Salticidae), the members of most families of hunting spiders, most of the web weavers, and the spiders that lurk on flowers and other fixed locations waiting for some insect to come their way have very poor eyesight. Instead, these spiders hunt using their extreme sensitivity to vibrations.





Page1| Page 2



Unlike insects, spiders have no antennae (feelers). Instead, they have pedipalps, sometimes just called palps, which are two additional appendages next to their mouth parts that, besides having other functions, they use to help themselves manipulate the food that they eat. Spider haemolymph (the equivalent of blood) does not circulate through vessels, but just fills the body of the spider. This is called an open circulatory system. The spider's respiratory anatomy is based on a tracheal system, with each opening to the trachea as an extension of an outer pore reaching from the spider abdomen, protected by spiracles which are pores in the spider exoskeleton, composed of chitin.

Image Number 1 Comes From The N.R.C.S.
Images 2 Through 5 Comes From The U.S.F.W.S.
Images 6 Through 8 Come From N.O.A.A.



























Aligator
Dinosaur
Frog
Komodo Dragon
Lizard
Sea Turtle
Snake
Toad
Tortoise
Turtle
MORE...


Carp
Catfish
Crab
Crayfish
Eel
Largemouth Bass
Lobster
Minnow
Pike
Octopus
Perch
Salmon
Sea Horse
Starfish
Stingray
Sunfish
Trout
Tuna
MORE...









All text contained in Animaltrek.com is licensed to the public under the GNU Free Documentation License (GFDL). All Information is courtesy of Wikipedia.
Copyrights | Privacy Policy | © 2005 FUN GROUP INC.