Marine Worms Flatworms Tapeworms Segmented Worms Roundworms and

Marine Worms (Flatworms, Tapeworms, Segmented Worms, Roundworms, and Giant Tube Worms)

General Stuff About Worms… • Worms are found pretty much everywhere in the ocean. • Most worms tend to live near the seafloor. • Some of the worms we will be discussing are parasitic. • There a number of different groups , or phylums, each having it’s own distinctive characteristics.

Worms, Worms!

Phylum- Platyhelminthes (aka: Flatworms) § Have flat bodies. § Found in both fresh and salt water. § Can range in size from microscopic to nearly 20 meters (60 feet!) § Have bilateral symmetry. § Move by contracting muscles and beating of cilia. § Have a very simple nervous system. § Have a very simple digestive system. § Reproduce asexually (regeneration) or sexually (hermaphrodite).

Flatworms

Flatworms http: //www. youtube. com/watch? v =o. Te. SIP_e. Pkw

Flatworms

Tapeworms § These worms are parasites. § They live in or on the body of a host organism. § They do not need digestive systems because the absorb nutrients directly from the host into their own bodies. § Some examples are: Blood fluke, Liver Fluke, Trematode.

Tapeworms

Let’s go to the Video!

That’s just Nasty!!! • http: //www. youtube. com/watch? v=8 FYg QFSr. ZDE&NR=l • http: //www. youtube. com/watch? v=ESSZ MF 578 Ig

Roundworms • These are the most common type of worm. • There about 10, 000 different species of roundworm! • They generally live at the bottoms of oceans, and burrow in sand mud. • They whip their bodies back and forth to move around. • Some can swim. • They belong to the phylum Nematoda. • There are two sexes, but some are still hermaphroditic.

Roundworms

Intestinal Roundworm Infestation

Segmented Worms • Typically found in moist soil or sand. • Belong to the Phylum “Annelida”. • There are more than 10, 000 species of segmented worms. • They have a well developed digestive, circulatory, and nervous system. • They breathe through their skin and have moist bodies. • Oxygen and Carbon Dioxide diffuse through the skin.

Segmented Worms