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Crustaceans and Echinoderms

Invertebrates
by

Evelyn Kytan

on 26 April 2010

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Transcript of Crustaceans and Echinoderms

Crustaceans and Echnioderms
Scientific name: Crustacea
General Information
Invertebrate
Hard outer shell used for protection
Jointed legs and segmented bodies
Live in the sea or fresh water
A few species have adapted to live on land



Examples Shrimp
Crabs
Lobsters
Prawns
Barnacles
Woodlice Food Web People, whales, fish and birds eat crustaceans
They feed on dead creatures, scraps and plants Eat at night and hide during the day
They take water over their filters and then use their apendages to filter the food out of the water Crustaceans create disturbance through predation on commercial harvests, attacks on macroalgae, introductions as exotic species, and interference competition. Amphipods are also affected by disturbance events, both man-made and natural. Anthropogenic disturbance includes environmental alteration by toxins, oil, organic enrichment, acidification, salinity alteration, and ships' wakes. Current Environmental Concerns Respiratory System A Echinoderm uses some of the bumps or spines on its surface to take in oxygen. It has a gill structure to take in the oxygen. It has a poorly developed respiratory system. Nervous System A Echinoderm has eyespots which can detect light. Their eyespots are not as sharp as human eyes. It generally has a poorly developed nervous system. Echinoderms Examples include Feather Stars, Starfish, Sea Urchins, Brittle Stars, Sea Cucumbers, Sand Dollars and Sea Lilies Their bodies have more than two cell layers, tissues and organs. But, their nervous system includes a circum-esophageal ring. They also have a water vascular system, which hydraulically operates the tube feet or feeding tentacles. They do not have excretory organs. They normally possess a sub-epidermal system of calcareous plates. Reproduction occurs sexually. They feed on fine particles in the water, detritus or other animals. All Echinodermata live in the marine environments.
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