Invertebrates, Mollusks, Arthropods and Echinoderms

Science

Watch Lesson: Invertebrates, Mollusks, Arthropods and Echinoderms

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a feeler on the head of a crustacean or insect

A Feeler On The Head Of A Crustacean Or Insect.

Antenna

Antenna Simple Definition

the opening at the end of the digestive tract where waste leaves the body

The Opening At The End Of The Digestive Tract Where Waste Leaves The Body.

Anus

Anus Simple Definition

an invertebrate with an exoskeleton, jointed legs, and segmented body, like any insect, spider, crab etc

An Invertebrate With An Exoskeleton, Jointed Legs, And Segmented Body, Like Any Insect, Spider, Crab Etc.

Arthropod

Arthropod Simple Definition

body plan composed of two halves which are mirror images of each other

Body Plan Composed Of Two Halves Which Are Mirror Images Of Each Other.

Bilateral Symmetry

Bilateral Symmetry Simple Definition

a circulation system in which blood flows within a network of vessels

A Circulation System In Which Blood Flows Within A Network Of Vessels.

Closed Circulatory System

Closed Circulatory System Simple Definition

aquatic invertebrates with stinging cells, like a jellyfish

Aquatic Invertebrates With Stinging Cells, Like A Jellyfish.

Cnidarian

Cnidarian Simple Definition

a marine invertebrate with an internal skeleton and a water vascular system, like a starfish

A Marine Invertebrate With An Internal Skeleton And A Water Vascular System, Like A Starfish.

Echinoderm

Echinoderm Simple Definition

an internal skeleton, it is made of bone and/or cartilage

An Internal Skeleton, It Is Made Of Bone And/or Cartilage.

Endoskeleton

Endoskeleton Simple Definition

the hard outer covering that protects some animals, like spiders

The Hard Outer Covering That Protects Some Animals, Like Spiders.

Exoskeleton

Exoskeleton Simple Definition

an arthropod with three body segments, six legs, two antennae, and compound eyes

An Arthropod With Three Body Segments, Six Legs, Two Antennae, And Compound Eyes.

Insect

Insect Simple Definition

an animal without a backbone

An Animal Without A Backbone.

Invertebrate

Invertebrate Simple Definition

the immature form of an animal, it looks very different from the adult form

The Immature Form Of An Animal, It Looks Very Different From The Adult Form.

Larva

Larva Simple Definition

the respiratory organ that absorbs oxygen from the air and removes carbon dioxide from the blood

The Respiratory Organ That Absorbs Oxygen From The Air And Removes Carbon Dioxide From The Blood.

Lung

Lung Simple Definition

an umbrella-shaped free-swimming organism, like a jellyfish or hydra

An Umbrella-shaped Free-swimming Organism, Like A Jellyfish Or Hydra.

Medusa

Medusa Simple Definition

changes in form as an animal becomes an adult

Changes In Form As An Animal Becomes An Adult.

Metamorphosis

Metamorphosis Simple Definition

an animal with a soft body and a muscular foot, it may also have a shell, like a snail or squid

An Animal With A Soft Body And A Muscular Foot, It May Also Have A Shell, Like A Snail Or Squid.

Mollusk

Mollusk Simple Definition

the shedding and replacement of an exoskeleton, skin or feathers

The Shedding And Replacement Of An Exoskeleton, Skin Or Feathers.

Molting

Molting Simple Definition

a system in which blood moves through open spaces as well as vessels

A System In Which Blood Moves Through Open Spaces As Well As Vessels.

Open Circulatory System

Open Circulatory System Simple Definition

a tube-shaped organism usually attached to a surface, it is a life stage of a cnidarian

A Tube-shaped Organism Usually Attached To A Surface, It Is A Life Stage Of A Cnidarian.

Polyp

Polyp Simple Definition

body parts arranged in a circle around a central point

Body Parts Arranged In A Circle Around A Central Point.

Radial Symmetry

Radial Symmetry Simple Definition

a tonguelike organ with teeth in mollusks like snails

A Tonguelike Organ With Teeth In Mollusks Like Snails.

Radula

Radula Simple Definition

hollow tubes that end in suction cups, echinoderms use them to move and collect food

Hollow Tubes That End In Suction Cups, Echinoderms Use Them To Move And Collect Food.

Tube Feet

Tube Feet Simple Definition

a system of fluid-filled tubes in echinoderms like starfish

A System Of Fluid-filled Tubes In Echinoderms Like Starfish.

Water Vascular System

Water Vascular System Simple Definition

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