Lavrov and Kosevich (2016) took this to the next level when they mechanically separated sponge cells and saw them reaggregate again before their very eyes! One of the craziest things about sponges is that they are an aggregation of cells in space and time at that moment, they are part of that sponge, but they could be part of another sponge at a different time. Sponges don’t exactly have any true tissues or organs what they do have is a mesohyl (a gelatinous matrix that resembles a type of connective tissue) sandwiched between two thin layers of cells (more on the different types of cells soon). Porifera is estimated to contain around 15,000 species of sponge, many of which have not even been described yet (Degnan et al., 2015). Porifera are the first group of marine invertebrates I will be chatting about over the next few weeks, so move over megafauna cause the little guys are in town! Description Yes, they are animals, albeit they are the most primitive of all multicellular creatures as they were the first to separate from the common ancestor of animals, but animals nonetheless (Feuda et al., 2017 Giribet, 2016). Phylum Porifera, better known as the sponges, are an interesting group of animals.
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