Classification Information For Marine And Fresh Waters Essay
Classification information for Poriferans:
Poriferans, better known as sponges, consist of 5000 known species, all located primarily in marine and fresh waters (Myers, 2001a). They are multicellular, heterotrophic, invertebrates with an irregular shape and no distinct pattern of symmetry (Myers, 2001a). Overall, they are the simplest of animals; thus, lacking any true tissue and/or germ layers (Myers, 2001a). Furthermore, they are known to be highly sessile, and feed by collecting bacteria from the water that streams through their porous bodies (Myers, 2001a). Feeding is known to be distinct, as their flagellated cells called choanocytes, trap bacteria in mucus, which allows them to then engulf the food via phagocytosis (Myers, 2001a). All in all, poriferans are amazing animals, as even a small broken off fragment can allow regeneration of an entirely new sponge body (Myers, n.d.a).
There are three major groups of Poriferans including Demosponges, Hexactinellid sponges, and Calcareous sponges; all which are primarily known to differ specifically in the type of extracellular strengthening material that they are able to produce (Myers, 2001a).
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