They do thisīy swishing their flagella which pulls water through the incurrent pore - water Color all the epithelialĬells (B) of the epidermis peach or pink.Ĭells (A) whose function is to circulate water through the sponge. The outer layer of the sponge is the epidermis which is made of flat cells called epithelial cells. The primitive structure of a sponge consists of only two layers of cells separatedīy a non-living jelly like substance. Sponges exhibit less specialization (adaptation of a cell for a particular function) of cells than most invertebrates. Instead, they are filter feeders, meaning they obtain their foodīy straining the water for small bits of food like bacteria, algae or protozoans. Since they cannot move, sponges cannot pursue Pores, a sponge can soak up and release water. Porifera in Latin means "pore-bearer"Īnd refers to the many pores or openings in these animals.
Sponges, like all animals, are eukaryotic - meaning Most (but not all) sponges are asymmetricalĪnd have no definite shape. This phylum is thought to represent the transition from unicellularĪnimals to multicellular animals. That sponges are simple, multicellular animals in the Kingdom Animalia, Phylum Is understandable why early biologists thought they were plants.
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