Flatworms

eye spots

they are consumer or predators and they are parasitic like tapeworms and flukes

one is segmented

They belong to any class that are under the phylum platyhelminthes.

Flat worms are cold blooded.

nephridia

In gereral, the more poorly differentiated (the fewer complex structures that have specific functions) an organism is, the greater its ability to live and re-grow after being cut apart. Worms have this ability to re-grow in entirety, as do lower organisms like amoebas and fungi. In flatworms, their cells have the ability to differentiate into any type of tissue that the worm might need. These types of cells are called stem cells, and are the subject of ongoing research in medicine as to their applications in humans. There is a limit, however. a tiny slice of flatworm would not be able to develop into another worm.

earth worms and other members of PHYLUM ANNELIDA are different from other worms in that they are SEGMENTED meaning that internaly, earthworms separated into segments by a thin membrane called the SEPTUM. Earth worms are also known for their barrel shaped CLITELLUM -----------=----

..............................................................................................^

.......................................................................................this thing

that usulally covers segments 32-37. one more thing... earth worms have a CLOSED circulatory system, while most other worms have OPEN circulatory systems. hope this helps

Flatworms and Roundworms have bilateral symmetry as a body type.

I think it is asexual.

Ascarids are not vertebrates; they are of the genus Ascaridae, parasitic nematodes generally thought of as intestinal roundworms. Parascaris equorum, the equine roundworm and probably the most common Ascarid, infects horses, donkeys, and zebras, but is not known to infect humans or other animals. Ascarids are usually species-specific -- Ascaris lumbricoides affects humans and causes the disease ascariasis while Ascaris suum infects pigs, but there is a possibility that these two species may cross-infect humans and pigs.

A planaria obtains food by using eyespots and special "smelling" cells to locate food. Then the planaria inserts a feeding tube and releases digestive chemicals. Then the planaria sucks up the half digested bits of food. Lovely, isn't it!

By eliminating it.

yes!

They belong to the Class Annelida subclass Hirundea - segmented worms.

No they don't molt *

*to molt it means to grow out of its skin

0 to 20 and more metars

"Movement in some flatworms is controlled by longitudinal, circular, and oblique layers of muscle. Others move along slime trails by the beating of epidermal cilia."

Citation:

Myers, P. 2002. "Platyhelminthes" (On-line), Animal Diversity Web. Accessed April 17, 2009 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Platyhelminthes.html.

There is a special reason that flatworms are flat.

Because of their flatness the area of their 'body' is bigger (so a bigger surface area). Through this characteristic, they are able to diffuse more in and out of their endosystem.

It seeks out and eats other organisms.

no

I wouldn't exactly say that they have a specific "niche".

They do play an important role in biochemical memory and stem cell research.

(Economical role)

They are VERY important for stem cell research because of their extreme rates of regeneration and their ability to regenerate even when cut up into shreds.

Hope this helps!

worms carry out gas exchange by absorbing air through their skin

Roundworms do not have hearts, skeletons, nor blood vessels. Roundworms belong to the phylum Nematoda. This group contains different types of animals like the hookworm and pinworm.

No, triploblastic.

Flatowrms have muscle cells, they are a triploblastic phylum. They have endo, meso and ectoderm layers

Sponges are Parazoa and lack any true tissue at all

Cnidaria are diploblastic, having only endoderm and ectoderm