Lecture 11 - Protostome Animals (Lophotrochozoans & Ecdysozoans)

This set of flashcards covers the main vocabulary terms and concepts from the lecture on Protostome Animals, focusing on their classification, characteristics, and examples.

Protostome

A type of animal distinguished by embryonic development where the mouth forms before the anus during gastrulation.

Deuterostome

A group of animals characterized by embryonic development that forms the anus before the mouth.

Lophotrochozoa

A monophyletic group of protostomes encompassing animals such as annelids, mollusks, brachiopods, and rotifers.

Ecdysozoa

A major group of protostomes that grow by molting or shedding their exoskeleton.

Coelomate

An organism with a body cavity completely lined by mesoderm.

Acoelomate

An organism that lacks a body cavity.

Rotifera

A phylum of mostly tiny, coelomate suspension feeders with a cluster of cilia at their anterior end.

Platyhelminthes

A phylum of acoelomate organisms commonly known as flatworms.

Annelida

A phylum of coelomate, segmented worms with a complete digestive tract.

Mollusca

A diverse phylum of coelomate animals characterized by a body plan that includes a foot, visceral mass, and mantle.

Echinodermata

A phylum comprising marine animals characterized by a unique water vascular system.

Metamorphosis

A biological process by which an animal undergoes a transformation from larva to adult.

Nematoda

A phylum of unsegmented worms commonly known as roundworms.

Tardigrada

A phylum of microscopic animals known as water bears, capable of surviving extreme conditions.

Onychophora

A phylum of segmented worms also known as velvet worms, primarily found in moist habitats.

Chelicerata

A subphylum of arthropods including spiders and scorpions, characterized by the presence of chelicerae.

Crustacea

A diverse group within the Arthropoda, including crabs, lobsters, and shrimp, recognized by their two pairs of antennae.

Body Plan

The structural arrangement of the body, including segmentation, appendages, and exoskeleton.

Radula

A tongue-like structure with chitinous teeth used by mollusks to scrape food.

Ecdysis

The process of shedding the outer layer or exoskeleton in ecdysozoans.