The phylum Nematoda
Aget - 10 centaurus
The nematodesor roundworms constitute the phylum Nematoda. They are a diverse animal phylum inhabiting a very broad range of environments. Nematode species can be difficult to distinguish, and although over 25,000 have been described half are parasitic. Unlike cnidarians and flatworms namtodes have a digestive system adn have openings at both end.
Characteristics of Nematoda:
1)Bilaterally symmetrical, and vermiform.
2)Body has more than two cell layers, tissues and organs.
3)Body cavity is a pseudocoel, body fluid under high pressure.
4)Body possesses a through gut with a subterminal anus.
5)Body covered in a complex cuticle.
6)Has a nervous system with pharyngeal nerve ring.
7)Has no circulatory system (no blood system)
8)Reproduction normally sexual and gonochoristic.
9)Feed on just about everything.
10)Live just about everywhere, many species are endoparasites.
Species of nematoda
Ascaris lumbricoides - giant roundworm
Ascaris lumbricoides is the giant roundworm of humans, growing to a length of up to 35 cm.It is one of several species ofAscaris. An ascarid nematode of the phylum Nematoda, it is the largest and most common parasitic worm in humans. This organism is responsible for the disease ascariasis
Resources
http://www.earthlife.net/inverts/nematoda.html
1)Bilaterally symmetrical, and vermiform.
2)Body has more than two cell layers, tissues and organs.
3)Body cavity is a pseudocoel, body fluid under high pressure.
4)Body possesses a through gut with a subterminal anus.
5)Body covered in a complex cuticle.
6)Has a nervous system with pharyngeal nerve ring.
7)Has no circulatory system (no blood system)
8)Reproduction normally sexual and gonochoristic.
9)Feed on just about everything.
10)Live just about everywhere, many species are endoparasites.
Species of nematoda
Ascaris lumbricoides - giant roundworm
Ascaris lumbricoides is the giant roundworm of humans, growing to a length of up to 35 cm.It is one of several species ofAscaris. An ascarid nematode of the phylum Nematoda, it is the largest and most common parasitic worm in humans. This organism is responsible for the disease ascariasis
Resources
http://www.earthlife.net/inverts/nematoda.html
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