Classification of Animals

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Presentation transcript:

Classification of Animals Kingdom Phylum Class Order Family Genus Species Classification of Animals Chapter 6.3 page 217

Key Terms Endothermic Ectothermic Exoskeleton Endoskeleton Animals that can generate their own heat and are able to control their body temperature Animals whose regulation of body temperature depends on external sources, such as sunlight or a heated rock surface. (cold-blooded) Endoskeleton Exoskeleton A skeleton inside the body A skeleton on the outside of the body

radial symmetry bilateral symmetry Body parts are arranged around a central axis – cut in any direction will result in two identical halves bilateral symmetry Only one way to cut into two equal parts

Animal's that don’t have a back bone Invertebrates Poriferans Cnidarians Echinoderms Annelids Nematodes Platyhelminths Molluscs Arthropods Animal's that don’t have a back bone

Poriferans live in the water and most are found in marine environments. They are commonly called sponges because they are full of holes (pores) through which water passes, carrying their food. They filter the food out of the water, and for this reason they are known as filter feeders. The wastes along with water are pushed out through an opening at the top of the sponge.

Cnidarians have radial symmetry. Jellyfish, sea anemones and coral polyps belong to this phylum. They have only one body opening. Food goes into the body through this opening and waste comes out of the same opening. Cnidarians all have stinging cells, which they use to catch their food.

Echinoderms also live in the ocean, often near the coast. Starfish, brittlestars, sea urchins and sea cucumbers belong to this phylum. Starfish, brittlestars and sea urchins have a spiny skin The skin of sea cucumbers is leathery. One thing common to all Echinoderms is that they have radial symmetry.

Annelids are found in water and in damp places on land. The most familiar annelid is the earthworm. Others include leeches and ragworms (often used as bait for fishing). Annelids have rings along the length of its body. These rings are segments or divisions within the body, and give the group their common name of ‘segmented worms’. These animals have bilateral symmetry.

Nematodes are also called worms, but they do not have segments Nematodes are also called worms, but they do not have segments. They are ‘round worms’ They have bilateral symmetry like annelids, with long tapered bodies that are pointed at each end. They are commonly found in damp soil, in water, and as parasites in the bodies of other organisms. Heart worm, a common disease of dogs, is caused by a nematode. Even humans can be hosts to parasitic nematodes. Parasites are organisms that live on or in another organism, called a host. They get their food from the host, but the host gets nothing in return and may be harmed.

Platyhelminths also have worm as part of their common name—they are flat worms. They have bilateral symmetry with the body flattened top to bottom They live in water or very moist places There are over 12 000 species of platyhelminths. Some are scavengers, cleaning up the wastes in the oceans and waterways, some eat microscopic animals, but many are parasites.

Molluscs are members of the second largest phylum in the animal kingdom. All of them live in water or in very moist places. Snails, slugs and oysters belong to this group. They come in a wide variety of shapes and sizes, but all have bilateral symmetry, have well developed internal organs, and have a muscular foot which they can use to move along. Some molluscs have a shell for protection.

Arthropods are found everywhere—on land, in the air and in water. They are the largest animal phylum, with over one million species described. Arthropods are able to survive on dry land because they have a waterproof exoskeleton The skeleton does not bend, so the limbs of arthropods (legs and antennae) are jointed to allow the animals to move. Inside, the body is divided into segments. These are sometimes visible as lines across the exoskeleton.

Other examples of Arthropods include:

Animals with a backbone Fish Amphians Reptiles Aves Mammals Marsupials Placentals Monotremes Vertebrates Animals with a backbone

Eg: human, whale, dog, horse, seal Placentals are mammals in which the baby is nourished inside the mother’s body by a placenta and the baby is born at a more mature stage. Eg: human, whale, dog, horse, seal Marsupials give birth to a tiny undeveloped young that climbs into the pouch where it is fed on milk. The young marsupial grows and completes its development in the pouch. Eg: wombat, kangaroo, koala, possum Monotremes are mammals that lay eggs. Eg: echidna and platypus.