Complex Invertebrates Arthropods and Echinoderms

Complex Invertebrates

Arthropods and Echinoderms

15-3 Arthropods

Arthropods More than a million

have been identified

Main competition for food

Insects, Crustaceans, spiders, and scorpions

15-3 Arthropods

3 Main Characteristics Exoskeleton

Rigid covering Does not grow

Must be shed (molting)

15-3 Arthropods

3 Main Characteristics Segmented body Jointed appendages

15-3 Arthropods

Open Circulatory system Blood is not

contained in tubes From heart through

open spaces in body

Blood carried food but not oxygen

Reproduce sexually Stay males and

females

15-3 Arthropods

Crustaceans Crabs Lobsters Barnacles Shrimp

15-3 Arthropods

Crustaceans Body divided into

segments A pair of

appendages is attached to each segment

Claws, legs, or antennae

Can regenerate certain body parts

15-3 Arthropods

Crustaceans Most live in watery environments Breath through gills

15-3 Arthropods

Centipedes Have one pair of

legs in each segment of their body

Have claws that inject venom

Carnivores Live in moist

environments

15-3 Arthropods

Millipedes Have 2 pairs of

legs for each segment of their body

Herbivores Roll up in ball when

in danger Live under logs and

rocks

15-3 Arthropods

Arachnids Body divided into 2

parts Head and

abdomen 4 pairs of legs

Are attached to their head

15-3 Arthropods

Spiders Feed on insects or

small vertebrates Webs

Made of silk Secreted by

structures in abdomen

Most are remade every day

15-3 Arthropods

Funnel Web

15-3 Arthropods

Trapdoor Web

15-3 Arthropods

Spiders Injects venom in

prey through fangs Either kills or

paralyzes prey Preserves living

creatures

15-3 Arthropods

Spiders Have book lungs

Has several sheets of tissue

As oxygen passes over sheets it is removed

15-3 Arthropods

Scorpions Have large stingers Hold prey with

claws Live under rocks

and logs Nocturnal

15-3 Arthropods

Ticks and Mites Live on other

organisms Live off body fluids

Juices of plants Blood of animals

15-3 Arthropods

Insect Structure 3 Parts

Head Chest (Thorax) Abdomen

Has 3 pairs of legs attached to the chest

15-3 Arthropods

Insect Structure Many eyes

Compound eyes Contain many

lenses Detect

movement Simple eyes

Detect light and dark

15-3 Arthropods

Insect Structure Most have wings

Can have many pairs

Has series of tubes for carrying oxygen

Reproduce sexually

15-3 Arthropods

Growth and Development Grow rapidly

Must shed exoskeleton

Metamorphosis When an insect

changes their appearance during development

15-3 Arthropods

Metamorphosis Complete

4 stage process Egg Larva

Spends most of the time eating

Pupa Usually

covered in cocoon or chrysalis

Adult

15-3 Arthropods

Metamorphosis Incomplete

Egg Young

Nymphs Looks like adult

but doesn’t have all characteristics

Adult

15-3 Arthropods

Insect Behavior Most live solitary

lives Do not directly

compete for available food

Males must attract females

Buzzing Colors/lights Pheromones

Chemicals that attract opposite sex

5-3 Arthropods

Insect Behavior Social insects

Can not survive on their own

Form colonies or hives

Individuals perform specific jobs

15-3 Arthropods

Defense Mechanisms Mimics

Look like surroundings

Look like a predator

Weapons Stingers Bite Venom

15-3 Arthropods

Syrphid Fly

15-3 Arthropods

Walking Stick

15-3 Arthropods

Viceroy Butterfly

15-3 Arthropods

Owl Butterfly

11-3 Echinoderms: The “Spiny-Skinned” Animals

Echinoderms Spiny skin Internal skeleton

Bone like plates Made of calcium

5 part body

11-3 Echinoderms: The “Spiny-Skinned” Animals

Echinoderms Water vascular

system Fluid-filled

internal tubes that…

carry food and oxygen

Remove waste Help with

movement

11-3 Echinoderms: The “Spiny-Skinned” Animals

Echinoderms Tube feet

Suction-cuplike Use to walk Use to open

shells and catch food

11-3 Echinoderms: The “Spiny-Skinned” Animals

Starfish Have 5 or more

arms extending from a central body

Have hundreds of tube feet

Used to open clams

Regenerate

11-3 Echinoderms: The “Spiny-Skinned” Animals

Sea Lilies

11-3 Echinoderms: The “Spiny-Skinned” Animals

Feather Star

11-3 Echinoderms: The “Spiny-Skinned” Animals

Sea Cucumber

11-3 Echinoderms: The “Spiny-Skinned” Animals

Sea Urchins

11-3 Echinoderms: The “Spiny-Skinned” Animals

Sand Dollar

11-3 Echinoderms: The “Spiny-Skinned” Animals