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Mollusks, Arthropoda, and Echinoderms

Mollusks, Arthropoda, and Echinoderms . By: Amber Ulrich, Sam Walkowski, Ashley Brinson. Mollusk.

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Mollusks, Arthropoda, and Echinoderms

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  1. Mollusks, Arthropoda, and Echinoderms By: Amber Ulrich, Sam Walkowski, Ashley Brinson

  2. Mollusk The majority of mollusk species live in marine environments. Some are found on the sub tidal and continental shelf. They are also found throughout the water column of the ocean and some live near the hydrothermal vents. Not all mollusks are marine, some live on land. A number of the mollusk play an important role for humans as sea foods and decorative shells.

  3. Molluska Latin: soft Mollusks are soft bodied animals that usually have an internal or external shell Ancestors lived more than 550 million years ago. Include: snails, slugs, clams, squids, and octopi. Mostly all look different but share similar developmental stages.

  4. Groups: GASTROPOD- shell-less or single shelled mollusks that move by using a muscular foot located on the ventral side Examples: Snails, Slugs, Sea Hares BIVALVES- members of this class have two shells that are held together by one or two powerful muscles Examples: Clams, Oysters, Mussels, Scallops CEPHALOPODS- typically soft bodied mollusks in which the head is attached to a single foot Examples: Cuttlefish, Octopi, Squid

  5. The body plan if most mollusks has four parts: Foot-flat structures for crawling, spade shape structures for burrowing, and tentacles for capturing prey Mantle-a thin layer of tissue that covers most of the body Shell- made by glands in the mantle that securer that calcium carbonate Visceral Mass-internal organs

  6. Echinoderms

  7. characteristics • Echinoderms have calcified plates in their body wall which gives them a spinney skinned appearance. • They have tubular feet which are used to attach to objects for protection or to obtain food. • Almost all echinoderms have an internal skeleton to protect them • If they happen to lose a limb it will eventually grow back • They also have a water vascular system which may allow them to function without gills.

  8. Habitat • All echinoderms are marine animals that can be found in any ocean • They are more abundant in reefs but are also found on shallow shorelines. • Some examples are starfish, sea cucumbers, sea urchins, and sand dollars. • Most live on the ocean floor but some attach to rocks, logs, or floating debris. • Almost all echinoderms move around while some don’t and just stay in place.

  9. Arthropoda

  10. Quick Facts • Arthropods are the most successful group of animals • They are found in any environment • Insects are the most dominant group of animals on Earth • Insecta is the largest class of the arthropod phylum

  11. Classes of Arthropoda • Insecta- grasshoppers, bees, etc • Arachnida- spiders, ticks, mites, scorpions • Crustaceans- lobsters, crabs, crayfish • Chilopoda- centipedes • Diplopoda- milipedes

  12. Characteristics • Arthropodia- “jointed feet” • Moveable joints • Hard, chitinous exoskeleton • Dorsal Heart • Ventral nervous system • Special sense receptors • Open circulatory system Molting cicada

  13. Dangerous Arthropods • Many live as parasites • Transmit diseases -lime disease -typhus fever -malaria -west nile virus -bubonic plague Mosquitoes can carry many diseases

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