1.3 Classifying Animals by Dale Hill by Dale Hill

Echinoderms - complex invertebrate

dale_hill — 2014-06-23 10:32:40 UTC

These are a little tricky because they have an endoskeleton, like a vertebrate, but here's the difference: the vertebrate pokes out of their skin!

Arthropods - complex invertebrates

dale_hill — 2014-06-23 10:36:50 UTC

There are more arthropods than any other kind of animal. There bodies are efficient with hard exoskeletons for protection and paired legs for speed. They also have a simple nervous system that works very well.

Cnidarians-simple invertebrate

dale_hill — 2014-06-23 11:13:27 UTC

These guys look gentle with their soft bodies, but they have stinger cells that poison and hold their prey until they finish eating.

Worms- simple invertebrates

dale_hill — 2014-06-23 11:45:20 UTC

All worms have bilateral symmetry. There are 3 different kinds of worms: flatworms, roundworms, and segmented worms.

Vertebrates- All vertebrates have bilateral symmetry and endoskeletons. Vertebrate subclasses include mammals, birds, reptiles, amphibians, and fish.

dale_hill — 2014-06-23 12:12:34 UTC

Fish

dale_hill — 2014-06-23 17:28:20 UTC

All fish are cold-blooded, but there are 3 different types of fish all with different inner structures.

1. Jawless fish have a flexible nerve cord with no covering.

2. Cartilaginous fish have a nerve cord covered with cartilage instead of bones.

3. Bony fish have a nerve cord covered by bone.

So I know what you're wondering: Why is a jawless fish a vertebrate then? Check out this dissection of a lamprey and we'll discuss it.

Amphibians

dale_hill — 2014-06-23 17:42:31 UTC

This includes frogs, toads, and salamanders. All amphibians are cold-blooded and are adapted to spend part of their lives on land and part in water.

For a great video on the differences between toads and frogs

Reptiles

dale_hill — 2014-06-23 17:50:54 UTC

These guys are cold-blooded and have thick, scaly, waterproof skin (even though they're land animals with lungs.) Reptiles include lizards, snakes, alligators, crocodiles, and turtles. Ever wonder what the differences between tortoises and turtles are? Check this out.

Mammals

dale_hill — 2014-06-24 14:16:50 UTC

All mammals have hair or fur, milk to feed their young, and large brains. They're also warm-blooded. There are 3 subclasses of mammals: monotremes, marsupials, and placental mammals. Monotremes lay eggs, marsupials carry babies in a pouch, and placental mammals carry babies inside the mother.

Birth of a kangaroo:

Invertebrates all have some type of exoskeleton. Invertebrate subclasses include worms, cnidarians, sponges, mollusks, arthropods, and echinoderms.

dale_hill — 2014-06-26 23:43:49 UTC

What is a Chordate? Are all Chordates vertebrates

dale_hill — 2014-08-30 21:50:56 UTC