Eucoelomates

Definition

Eucoelomates are animals with a true coelom, a body cavity completely lined by mesoderm tissue. This feature allows for the development of complex organs and organ systems.

5 Must Know Facts For Your Next Test

1. Eucoelomates possess a fully lined body cavity called a coelom, which differentiates them from pseudocoelomates and acoelomates.
2. The coelom in eucoelomates provides space for the development and suspension of internal organs, offering greater structural complexity.
3. Examples of eucoelomates include arthropods, mollusks, annelids, echinoderms, and chordates.
4. The presence of a true coelom is associated with more advanced levels of tissue specialization and organ development.
5. The formation of the coelom occurs during embryonic development through one of two processes: schizocoely or enterocoely.

Review Questions

• What distinguishes eucoelomates from pseudocoelomates and acoelomates?
• Why is the presence of a coelom significant for the structural complexity in eucoelomates?
• Can you list three examples of animals that are classified as eucoelomates?

Related terms

Pseudocoelomate: Animals having a body cavity partially lined with mesoderm tissue.

Acoelomate: Animals lacking a body cavity between the digestive tract and outer body wall.

Mesoderm: The middle layer of an embryo in early development that gives rise to muscles and most internal organs.