Sponges, or poriferans, are animals of the phylum Porifera. They are sessile, mostly marine, waterdwelling filter feeders, pumping water through their matrix and filtering out particulates of food matter. Sponges are among the simplest of animals, with partially differentiated tissues but without muscles, nerves, and internal organs. In some ways they are closer to being a cell colony than multicellular organisms. There are over 15000 modern species of sponges known, and more are being discovered every day. The fossil record of sponges dates back to the precambrian era. The structure of a sponge is simple: it is shaped like a tube, with the end stuck to a rock or other object. The open end is called the osculum, and the interior is the spongocoel. The walls are perforated with microscopic pores that allow water to flow through the spongocoel.













Page1| Page 2 | Page 3


Although animals, sponges may also be considered multi-cellular colonies. A sponge can be placed in a blender and the remaining living cells will reform themselves into another sponge. If multiple sponges are blended together, each species will recombine independently. It is thought that the earliest animal life on Earth resembled sponges. The earliest known multicelled animal fossils are sponges from China that are roughly 600,000,000 years old. Sponges have not been as extensively studied as some other phyla and there may be some surprises still to be found. For example, it has recently been shown that some sponges are not sessile and can move to more favorable locations as rapidly as few cm a day. Another sponge, the Venus Flower Basket has some newly discovered uses involving fiber optics.

Above Images Come From The NOAA





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.