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INVERTEBRATE ANIMALS 20 AINHOA, medusas, patricio, araña, bob esponja,…
IN
VERTEBRATE ANIMALS 20 AINHOA
What is an invertebrate animal?
Invertebrates do not have an internal skeleton made up of bones, so they do not have backbone.Most invertebrates are oviparous
Clasificaton
Arthropods
Worms
Echinoderms
Sponges
Cnidarians
Molluscs
Cnidarians
They have poisous tentacles to catch their prey
They are acuatic
Cnidarians have soft bodies
Some can move about; others are attached to surfaces beneath the sea
Enchinoderms
They have an internal skeleton made up of plates
Many enchinoderms have spines
Enchinoderms are marine animals
Anthropods
They include;
Insects
Insects are the most abundant arthropods. They have got six legs and most have got 2 antennae. Their bodies are divided into three parts: The head, thorax and abdomen
Arachinids
Arachinids have 8 legs. They havent got antennae. Spiders and scorpions are arachinids
Crustacean
s
Crustaceans have a hard exoskeleton. They have got antennae and many have got ten legs. Most crustaceans are marine animals but also there are freshwater and terrestrial crustaceans. Crabs, Shrimps, Pown and pill bugs are crustaceans.
Myriapods
Myriapods have long bodies made up of many identical segments. Each segments has got 1 or 2 pairs of legs. They have also got a pair of antennae. Centipeds and millipeds are myriapods
Anthropods have an external skeleton, joined legs and segmented body
Molluscs
Many molluscs have a hard external shell
Most molluscs are aquatic, but some live on land
Molluscs have soft bodies
Sponges
They live attached to surfaces beneath the sea
They filter seawater throught tiny holes to obtain food
Sponges are aquatic
Worms
They do not have legs
Some worms are terrestrial and some aquetic
Worms have long, soft bodies
