Echinoderm Biology Quiz

Echinoderms typically exhibit pentaradial symmetry, not bilateral symmetry.

The water vascular system in echinoderms functions primarily for locomotion through the movement of tube feet.

Asteroidea, or sea stars, are characterized by pentaradial symmetry.

Sea stars use Aristotle's lantern, a complex jaw-like feeding structure, to feed on prey.

Ophiuroidea, or brittle stars, have long, flexible arms that resemble a snake.

Pedicellariae serve as protective structures, preventing debris and deterring predators.

Sea urchins have a spherical body covered in protective spines.

Ampullae are the fluid-filled structures that aid in the extension and retraction of tube feet in echinoderms.

Echinoidea, or sea urchins, exhibit pentamerous radial symmetry.

Holothuroidea, or sea cucumbers, have a flattened, elongated body shape.

The madreporite filters water into the echinoderm's water vascular system.

Holothuroidea, or sea cucumbers, have a long, flexible body covered in a leathery skin.

Crinoidea, or sea lilies, are characterized by a plant-like appearance and are often attached to the seafloor.

The unique feeding structure in sea urchins is called Aristotle's lantern.

Ampullae assist in the locomotion of echinoderms by regulating the water flow in the tube feet.

Holothuroidea, or sea cucumbers, have a soft, elongated body with a reduced endoskeleton.