Animal Development and Diversity

These flashcards detail essential vocabulary related to animal development and diversity, encompassing key terms and definitions discussed in the provided lecture notes.

Zygote

The fertilized egg cell, the initial stage of animal development.

Protostomes

Animals that undergo spiral cleavage and have determinate development.

Deuterostomes

Animals that undergo radial cleavage and have indeterminate development.

Lophophore

Hair-like structures that help certain aquatic invertebrates in feeding.

Trochophore

A small larval stage in some invertebrates that has a crown of cilia.

Cuticle

A protective layer that some animals shed throughout their lives, not acting as a skeleton.

Bilateral Symmetry

A body plan in which the left and right sides are mirror images.

Annelida

A phylum of segmented worms, such as earthworms.

Radula

A tongue-like organ of mollusks with rows of chitinous teeth used for scraping.

Ectotherm

Animals that depend on external sources to regulate their body temperature.