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How is this body design of flatworm different from the Cnidarian bauplan?
Flatworms exhibit a bilateral symmetry and aacoelomate body plan, meaning they lack a body cavity and have a simplified organization with three tissue layers. In contrast, cnidarians have a radial symmetry and a body plan characterized by a gelatinous mesoglea layer, with two main tissue layers: the ectoderm and endoderm, and a central gastrovascular cavity. Additionally, cnidarians possess specialized cells called cnidocytes for capturing prey, which flatworms lack. Overall, these fundamental differences in symmetry, body organization, and tissue structure distinguish flatworms from cnidarians.
What is the study of crustaceans?
Malacostracology (mala-"soft", costraca-"shell", -ology - "study of") is the formal branch of Zoology and Marine Science relating to the study of animals anatomically united by a bauplan, comprising of 20 body segments divided into head, thorax and abdomen regions, also known as "crustaceans". The focus of Malacostracology includes crab, lobster, shrimp, krill, crayfish, scuds, mantis shrimp, and false crustaceans - such as hermit crab, king crab, horseshoe crab and porcelain crab. The term "Malacostraca" refers to the same class of animals under biological taxonomy.
