BIOL 1200: Protostomes Lecture - Dr. Susan McRae

These flashcards cover key concepts and vocabulary from the lecture on Protostomes as presented by Dr. Susan McRae in BIOL 1200.

Acoelomate

An animal that has no body cavity between the digestive tract and outer body wall.

Coelomate

An animal that possesses a body cavity (coelom) filled with fluid, completely lined with mesoderm-derived tissue.

Protostomes

A clade of coelomates where the mouth develops from the blastopore; includes mollusks, annelids, and arthropods.

Deuterostomes

A clade of coelomates where the anus develops from the blastopore; includes echinoderms and chordates.

Spiral cleavage

A type of embryonic development characteristic of many protostomes where the planes of cell division are diagonal to the vertical axis.

Radial cleavage

A type of embryonic development characteristic of deuterostomes where the cell divisions are parallel and perpendicular to the vertical axis.

Schizocoelous

A method of coelom formation in protostomes whereby the mesoderm splits to form the coelom.

Enterocoelous

A method of coelom formation in deuterostomes where mesoderm buds from the wall of the archenteron.

Lophophore

A horseshoe-shaped circular fold of the body wall bearing ciliated tentacles surrounding the mouth, characteristic of certain lophophorate phyla.

Trochophore larva

A type of larvae with a distinctive body structure found in marine annelids and mollusks, undergoing metamorphosis into adult forms.

Parthenogenesis

A form of asexual reproduction where embryos develop from unfertilized eggs, producing females without fertilization.

Platyhelminthes

The phylum that includes flatworms, which can be free-living or parasitic, characterized by a flattened body.

Cestoidea

Class of flatworms known as tapeworms, which are parasitic and absorb nutrients across their body surface.

Annelida

The phylum of segmented worms, which have bodies divided into compartments and include earthworms and leeches.

Metanephridia

Paired excretory tubes in segmented worms that remove nitrogenous wastes from blood and coelomic fluid.

Oligochaeta

Class of annelids that includes earthworms, characterized by a simple body structure and is primarily terrestrial.

Polychaeta

Class of annelids mostly comprising marine segmented worms, often with specialized structures for locomotion and feeding.

Hirudinea

Class of annelids that includes leeches, some of which are blood-feeding parasites, possessing adaptations for a parasitic lifestyle.