acephalous
Acephalous is an adjective used in biology and zoology to describe organisms that lack a head. This term is often used to describe certain invertebrates, such as cnidarians (e.g., jellyfish, corals) and some flatworms (e.g., planarians). The absence of a head in these organisms is a result of their evolutionary history and adaptation to their specific environments.
The lack of a head in acephalous organisms does not imply a lack of sensory organs or
Acephalous organisms are an important part of many ecosystems, serving as both predators and prey. Their unique