General Characteristic Features of Phylum Nematoda 3. Rotifera (L., rota= wheel + ferre= to bear)Class 4. Characteristics of Platyhelminthes and Aschelminthes. Round worms are also free living and occur in fresh water, sea water and soil. •Size varies from microscopic to pencil-sized. Development may be direct or indirect. <>
•Covered with cuticle, having no external cilia. Aschelminths can be free-living or parasitic. Amphids are chemoreceptors (respond to chemicals). The dorsal lip has two double papillae, while each ventrolateral lip has one double papilla, one simple lateral papilla and a amphid. The organisms belonging to phylum Nematoda are multicellular, bilaterally symmetrical, unsegmented, triploblastic vermiform animals. Classification. When the infected Cyclops is taken in by man with water, the larvae escape from the Cyclops into the human intestine. Bilateral symmetry and Triploblastic. Invertebrate Zoology. History at your fingertips Biotechnology Cavities Nervous System Worms Diagram Animal Anatomy Science Spiders Genetics. Gastrotricha (L., gaster= stomach + trichos= hair)Class 5.

They are un-segmented. 14th Edition. they are sexually dimorphic and reproduce sexually. They cause serious agricultural, veterinary and human health problems. It causes a serious disease known as elephantiasis (= Filariasis) in the legs, arms, scrotum, etc.
It causes ancylostomiasis disease. �� � w !1AQaq"2�B���� #3R�br� Alimentary Canal: . Body having 3 layers of tissues with organs and organelles. Aschelminthes are pseudocoelomate, bilaterally symmetrical, triploblastic, unsegmented, vermiform, organ- system grade of construction with complete digestive tubes.

Its larvae enter the human body from moist soil by boring through the skin of the feet. Adult Trichinella spiralis is found in the small intestine of human beings and some other mammals like pigs, domestic animals and rodents, however, its encysted larvae are present in the striated muscles of the host. Aschelminthes .

-Male smaller and thinner than female.

There is no secondary host in the life cycle to this parasite. During indirect development a larva is present. Phylum Aschelminthes (Round Worm) – -Free living or parasitic, aquatic and terrestrial. animal reproductive system: Sponges, coelenterates, flatworms, and aschelminthesThe processes of sperm transfer and fertilization have been documented for only a few species of sponges. The pseudocoelomic fluid transports materials.

Adult Wuchereria bancrofti lives as an endoparasite in the lymphatic vessels and lymph nodes of human beings (primary host).

Get kids back-to-school ready with Expedition: Learn! Author of It lives in the caecum, appendix and colon of man, especially children. Examples: Ascaris (Giant intestinal round worm), Enterobius (Pm worm), Ancylostoma (Hook worm), Wuchereria (Filarial worm), etc. ��)��e4IJ�PԶBma�٫��|=�A:q Phasmidia: (i) Phasmids are present near hind end of body, (ii) Amphids are present near anterior end. Male genital ducts lead into the cloaca, female genital duct with a separate opening.Development is usually direct. Possesses a blind gut (i.e. Rhabditis maupasi lives in soil.

PHYLUM : NEMATODA –(Aschelminthes) CHARACTERISTICS •They are vermiform (worm-like), usually cylindrical in shape •Triploblastic and non-segmented, with bilateral symmetry. The classification here is based and modification from L. H. Hymann (1951) but Storer and Usinger (1971) have regarded different classification of Aschelminthes as separate phyla and rank Aschelminthes as superphylum.Aquatic or terrestrial, free-living or parasitic, elongated roundworm.Body wall with thick cuticle, cellular or syncytial epidermis and longitudinal muscles in four bands.Excretory system of glandular organs or canals or both.Nervous system with circumenteric ring and anterior and posterior nerves.Male with penial spicules and smaller than females.Gonads one or two.

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