Invertebrates part 2

Flatworms

Belong to the phylum Platyhelminthes and have bilateral symmetry.

Three tissue layers of flatworms

Ectoderm, mesoderm, and endoderm.

Ganglia in flatworms

Control center of the nervous system, similar to a brain.

Body symmetry of annelids

Bilateral symmetry.

Phylum of roundworms

Nematoda.

Roundworms' mode of movement

Whip-like motion facilitated by muscles along their body.

Circulatory system of annelids

Closed circulatory system with hearts (aortic arches) that pump blood.

Parts of mollusks

Foot, visceral mass, mantle, and shell.

Radula

A tongue-like structure used for scraping food.

Three classes of mollusks

Gastropoda, Bivalvia, and Cephalopoda.

Phylum of arthropods

Arthropoda.

Three characteristics of arthropods

Exoskeleton made of chitin, segmented body, and jointed appendages.

Types of metamorphosis in insects

Incomplete metamorphosis and complete metamorphosis.

Type of symmetry in echinoderms

Echinoderm larvae have bilateral symmetry; adults have radial symmetry.

Water vascular system in echinoderms

A network of fluid-filled canals used for locomotion, feeding, and gas exchange.

Tube feet in echinoderms

Used for movement and feeding.