What Is Meaning Of Acoelomate?
The meaning of the term acoelomate is that it is an invertebrate lacking a coelom especially, one belonging to the group comprising the flatworms and nemerteans and characterized by bilateral symmetry and a digestive cavity that is the only internal cavity.
In simpler words, we can also define the term acoelomate as it is an animal that does not possess a body cavity. The specific example of the acoelomate animal is a flatworm and the parasitic tapeworm.
True body cavities form only in multicellular organisms with true tissues. Within this group, the eumetozoa, there are organisms like coral and jellyfish, which consists of only 2 basic tissues. There are various types of acoelomates such as Pork tapeworm, Lion’s mane jellyfish, Portuguese man o’ war, Moon jelly, Turritopsis nutricula, Echinococcus granulosus, Taenia saginata, etc.
The acoelomate phyla are Placozoa, Porifera, Cnidaria, Ctenophora, Platyhelminthes, Mensozoa, Nemertina, and Gnathostomulida. In a simpler definition, acoelomate is the simplest form of animals that have 3 true tissues namely, endoderm, mesoderm, and ectoderm, in that order from inside to out. In an acoelomate, these tissues touch each other back-to-back, without any space in between them. The organs are surrounded by mesoderm, where the ectoderm is the skin, while the endoderm forms the digestive tract.