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Read on to find out why…Ī species frequently overlooked, once thought to be a plant, and one whose DNA sequences are present in every animal below and above the surface - the marine sponges (phylum Porifera) are one of the simplest, yet most fascinating organisms that I have come across in my biological studies! They arrived here from an ancient world, surviving the Precambrian seas (the earliest eon in the world's history). But these incredibly resilient creatures are under threat. Not only do sponges create homes for a variety of different organisms, but they also provide compounds for pharmaceuticals. Today we delve into their morphology, how they reproduce and what they eat. Groups of cells in the nerve net form nerve cords that may be essential for more rapid transmission.Marine sponges may not look like much, but these animals (yes, animals) are fascinating organisms. The function of the nerve cells is to carry signals from sensory cells and to contractile cells. The nervous system is primitive, with nerve cells scattered across the body in a network. However, organs and organ systems are not present in this phylum. There are differentiated cell types in each tissue layer, such as nerve cells, enzyme-secreting cells, and nutrient-absorbing cells, as well as intercellular connections between the cells. Between these two layers is a non-living, jelly-like mesoglea. The outer layer is called the epidermis, whereas the inner layer is called the gastrodermis and lines the digestive cavity. All cnidarians have two tissue layers, with a jelly-like mesoglea between them.Īll cnidarians have two tissue layers. \): Cnidarians have two distinct body plans, the (a) medusa and the (b) polyp.
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