Biology Quiz: Protostomal Coelomates

Diploblastic animals form two germ layers during early development: the ectoderm and the endoderm.

The mesoglea is a non-cellular or cellular region found between the ectoderm and endoderm in diploblastic animals.

The blastopore is the opening in the gastrula, which is the early stage of an embryo, that connects the internal cavity to the outside.

Triploblastic animals develop three germ layers: ectoderm, mesoderm, and endoderm.

Triploblastic animals are characterized by the formation of three embryonic layers: ectoderm, mesoderm, and endoderm. These layers give rise to specialized tissues, organs, and systems.

A fluid-filled internal space within the body of some animals, allowing for independent growth and movement of organs.

Animals that lack a true coelom. The space between their outer body wall and digestive system is filled with a specialized tissue called mesenchyme.

Animals with a coelom, meaning they possess a true body cavity that separates the body wall from the digestive system.

Animals with a false body cavity. The space between the body wall and digestive system is derived from the blastocoel, not a splitting of the mesoderm.

The fluid-filled space that exists in Pseudocoelomates. It develops from the blastocoel of the embryo, not from a splitting of the mesoderm.

The peritoneum is a membrane lining the coelom in eucoelomates. It separates the body wall from the visceral organs.

Schizocoely is the formation of a coelom by splitting of the mesoderm. Enterocoely happens when coelomic pockets form by evagination of the archenteron.

Animals with bilateral symmetry, a ventral nerve cord, and a mouth that forms from the blastopore. Their segmentation is spiral and determinate, and their coelom is formed by schizocoel.

A group of animals within Protostomal Coelomates including annelids, mollusks, and arthropods. Their defining feature is a ventral nerve cord located on the bottom side of their body.

The primary opening in the gastrula, the early stage of an embryo. In Protostomes, the blastopore develops into the mouth.

The process of forming a coelom by splitting of mesoderm tissue. Protostomes develop their coelom this way.

The type of segmentation in Protostomes where cell fates are predetermined during development.