These above-mentioned characters show that they are all living organisms that belong to Phylum Porifera. Their digestion is all intracellular and, no respiratory or excretory organs are present.Īll sponges are hermaphrodite (having both male and female sex organs in one body) but, cross-fertilization is the only rule of sexual reproduction. One or more water exits called oscula are present. Their body wall contains pores (ostia) that leads to canals and chambers that serve for the flow of water through it. ![]() Taking about histology, their body wall is differentiated into outer pinacoderm (dermal epithelium), inner choanoderm (gastral epithelium), and gelatinous non-cellular mesenchyme in between. All of them are sessile and fixed living in nature. They are 99% marine, a few freshwater species, and all aquatic in nature. Moreover, the majority of sponges are marine in nature. Sponges are all multicellular organisms with only the cellular level of body organization, with no distinct tissues or organs. You won’t find any such phylum named “Porifera” under the plant kingdom classification. Yes, sponges belong to phylum Porifera and Infrakingdom Parazoa of the Animal Kingdom. Sponges in Caribbean Sea, Cayman Islands Why Are Sponges Considered Animals? Here are the prominent reasons you should consider… #1. They are sessile, variously branched, have no apparent way of capturing food or eliminating waste, and show little response to stimuli. Sponges have managed to hide their true animal nature for several centuries. But, there are various strong pieces of evidence to consider them under the animals. There’s is no such strong evidence to consider it under the plants and so, it is not classified in any way under the Plant Kingdom. Moreover, they are diploblastic and have glycogen as the reserved food materials thus, they are called animals. Why Are Sponges Considered Animals? A sponge is an animal and not a plant because it is classified under Phylum Porifera of the Animal Kingdom, they are holozoic in nature and so capture food to eat, they don’t have cell walls, their life cycle includes larval stages. ![]() We’ll discuss them all in this article so just keep reading. Like plants, they remain adhered to one place at the bottom of the seawater or at the coral reefs.īut wait, there are some reasons to consider them as animals and not plants. ![]() This misconception is due to some of the characteristics of the sponges that make them seem like a plant. ![]() People often think and consider sponges as plants, rather than considering them as animals.
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