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Invertebrates Part 2

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by

Robert Williford

on 14 April 2015

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Transcript of Invertebrates Part 2

Invertebrates - continued
Arthropoda
Characteristics:
Jointed Limbs:
Characteristics
Brain -

arthropods have a developed brain that gives them different senses including advanced eyesight and bristles that sense pressure, vibration and chemicals.
Characteristics
Centipedes and Millipedes
Crustaceans include shrimp, barnacles, crabs and lobsters. All have mandibles and two pair of antennae. Double antennae sets this group apart from all other arthropods.
Crustaceans
Arachnids
Insects are the largest group of arthropods. All the insects in the world weigh more than all the other animals put together. Insect bodies have three main segments. They also have three pairs of legs and 3 pairs of mouthparts. All insects change forms during their development from egg to adult. This is called

metamorphosis.
Insects
Echinoderms
Echinoderms
have a system unique to themselves. The water vascular system uses water pumps to help the animal move, eat, breathe, and sense its environment.

Water Vascular System
In this section we will continue to discuss the different groups of invertebrates and the characteristics that make each group unique. We will cover arthropods and echinoderms in this section.
They have been around for hundreds of millions of years. They can live in all environments. You can find millions of them in one acre of land. 75% of all animal species are arthropods.
Segmented bodies -
arthropods bodies are separated into segments that have specialized functions.
Mandibles -
a single pair of antennae that are jaws.
Spiders, scorpions, mites, ticks, and daddy long-legs. Arachnids have two main body parts, no antennae, and 8 legs. They have no mandibles and instead have chelicerae that are fangs or pincers. They also do not have compound eyes. Instead they have eight separate simple eyes.
These are marine animals that include sea stars, sea urchins, sea lillies, sea cucumbers, brittle stars, and sand dollars. They live on the sea floor and scavenge for food. Some hunt shellfish and some eat algae. They are spiny skinned from an endoskeleton that is inside them much like our skeleton. Their larvae is bilateral but as adults they have radial symmetry.
Arthro means joint. This group of organisms is named after their segmented limbs that move at joints.
Exoskeleton
- a hard external skeleton made of chitin that allows the organism to live outside of water without drying out. Also functions as a suit of armor protecting the organisms organs.
Antennae -
feelers that respond to touch, taste, and smell.
Centipedes have one pair of legs per segment. Millipedes have two pairs of legs per segment.
Spiders do not carry diseases and are usually harmless to humans. They kill lots of insects for us. Ticks live in rural areas and forests and do carry diseases that can be very harmful to humans.
Endoskeleton
- an internal skeleton that supports the animal's body.
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