Unit 5 Vocab

Front

tube feet

Back

Small, flexible, sucker-tipped appendages connected to the water vascular system, used for movement, clinging to surfaces, and manipulating objects.

Front

ossicles

Back

Calcium carbonate plates that make up the endoskeleton; in sea urchins, these plates are fused into a rigid shell called a 'test'.

Front

pentaradial symmetry

Back

Radial symmetry in which the body is arranged in five parts around a central axis; echinoderm larvae are bilaterally symmetrical.

Front

exoskeleton

Back

A hard, external skeleton made of chitin providing protection and structural support; it does not grow and must be shed periodically.

Front

molting

Back

The process of shedding the old exoskeleton to allow for a new, larger one to form; also known as ecdysis.

Front

antennae

Back

Sensory appendages used to detect chemical signals, touch, air currents, and vibrations.

Front

jointed appendages

Back

Segmented limbs that allow for flexible movement, including legs, antennae, and mouthparts.

Front

mandibles

Back

Paired, jaw-like mouthparts used for biting, chewing, and grinding food.

Front

chelicerae

Back

Fang- or pincer-like mouthparts; in many spiders, they are hollow and connected to venom glands.

Front

metamorphosis

Back

The process of physical change during development.