Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
5 Cards in this Set
- Front
- Back
|
Nematodes form and function
|
Bilaterally symmetrical elongated, and tapered at both ends
Body covered with cuticle (noncellular)(secreted by eopidermis hypodermis). Cuticle shed 4 times during growth (ontogeny) Body wall has one complete layer of longitudinal muscle (not circular) Pseudocoel (body cavity derived from blastocoels Digestive system complete (mouth to anus) . Lumen of Pharyx/ Esopagus treradiate Secretory excretory system: Lateral canal ,ventral glands or both, which open near the anterior end through a ventral excretory pore. Sensory endings are modified cilia, |
|
|
Nematode reproduction
|
Most nematodes are dioecious
with great dimorphism: Females are usually larger, and the tail of males is more curled. The female reproductive system opens through a ventral vulva; the male system opens into a cloaca, together with the digestive system Some species are hermaphroditic Some parthenogenetic. Most are oviparous, but some are ovoviviparous. Adult nematodes vary in size from less than 1 mm, as in the genus Caenorhabditis, to more than 10 meters, as in Placentanema gigantisma. |
|
|
Nematode classification
|
Order Trichinellida Whipworms
Family Trichuridae: Trichuris trichiura FamilyTrichinellidae : Trichinella spp Order rhabditidae Superfamily: Strongiloidea Family Ancylostomatidae : Necator americanus Ascaridomorpha Family: Ascaridae : Ascaris lumbricoides Oxyuridomorpha, Enterobius vermicularis (Pinworm) Filarial worms Wuchereria bancrofti (elephantiasis) Onchocera volvulus (river blind disease) Loa loa Dracunculidae Dracunculus medinensis Guinea worms |
|
|
Nematode phylum
|
Phylum nematoda
|
|
|
Phylum: thorn-headed worms
|
Phylum: acanthocephala : thorn-headed worms (32)
From Wikipedica Acanthocephala (Greek ἄκανθος, akanthos, thorn + κεφαλή, kephale, head) is a phylum of parasitic worms known as acanthocephales, thorny-headed worms, or spiny-headed worms, characterized by the presence of an evertable proboscis, armed with spines, which it uses to pierce and hold the gut wall of its host. Considered part of rotifera phylum now. |
