Do Insects Have A True Coelom? A true coelom arises entirely within the mesoderm germ layer. Animals such as earthworms, snails, insects, starfish, and vertebrates are all eucoelomates. … Eucoelomates have a body cavity within the mesoderm, called a coelom, which is lined with mesoderm tissue. What type of coelom do flatworms have? Flatworms are
What Are Examples Of Coelomates? The protostome coelomates (acoelomates and pseudocoelomates are also protostomes) include the mollusks, annelids, arthropods, pogonophorans, apometamerans, tardigrades, onychophorans, phoronids, brachiopods, and bryozoans. Deuterostomes include the chaetognaths, echinoderms, hemichordates, and chordates. What are the are the 4 types of coelomates? Acoelomate: Coelom is absent. The blastocoel is completely occupied by mesoderm.