Flatworms

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

segmented worms have a closed circulatory system.in a closed circulatory system,

blood moves only within a connected network of tubes called blood vessels.

(it would be false to say that all flatworms are parasitic--the idiot that wrote that wasn't so smart, so I had to change that-- because the PLANARIAN-for example, is flatworm and that is a harmless little critter)

~round worms are ROUND

~flat worms are FLAT

~Round worms have 2 body openings (mouth & anus)

*random fact: 1/2 of all roundworms are PARASITIC, and 50 species affect humans**

# Flatworms can glide over surfaces, or the underside of a surface film of water, using small body hairs for movement. # The stomach is like a sack. The food goes into the sack through the mouth. Once the food is taken into the body, the rest is thrown back out of the mouth. (They have no anus). # They reproduce sexually (having both male and female organs) and asexually by splitting. Each piece that is split off becomes a separate worm. # They also reproduce by regeneration. They do this by producing a new worm from a broken piece.

idk what it is

flatworm

spines

whorm are douch

they eat foof

yes! they have both male and female functions for reproduction

No. Arthropod literally means jointed leg, and worms don´t even have legs ;) Arthropods are animals like insects, spiders and crustaceans. Tape worms are flatworms or Platyhelminthes.