Nematoda Flashcards
(25 cards)
The most important pseudocoelomate animals, both in abundance and impact on mankind
Nematoda
Habitat/s of Nematoda
Sea, Freshwater, Soil
Feeding on dead organic matter
Saprozoic
When a parasite passes the alimentary canal without infection or contaminant feces after release
Coprozoic
A nonliving outer layer secreted by the epidermis
Cuticle
Cuticle, must be molted via ____ because ____
Ecdysis; it restricts growth
When do Ecdysozoans, molt cuticles?
As they grow
Hormone that controls molting in insects and other arthropods
Ecdysone
Primitive type of cell that evolved to function as excretory cells
Protonephridia
The cuticle is an extracellular material of the ___
Hypodermis
Muscles of Nematodes are in ___ bands
Four
Skeleton of Nematodes
Hydrostatic
Paired lateral sensory structures at the anterior end of the worm
Amphids
Male has ____ to hold the female vulva open against ____
copulatory spicules; hydrostatic pressure
Causes Ascariasis in humans; found in the small intestine of humans
Ascaris lumbricoides
Ascaris found in intestines of horses
A. megalocephala
Ascaris found in pig intestines
A. suum
Female Ascaris may lay ____ eggs a day, which pass out in host’s ___
200,000; feces
Causes Trichinosis
Trichinella spiralis
Scratches the anal region and contaminates hands and bedclothes
Enterobius vermicularis
(Enterobius vermicularis) Adults live in the ____ ____ and ____
large intestine; cecum
___ species of filarial nematodes infect humans and some cause serious diseases
Eight
Cause inflammation and blockage of the lymphatic vessels
Filarial Worm
Explain how Lymphatic filariasis occurs
Females release live young, tiny microfilariae, into blood and lymph which mosquitoes ingest when they feed on infected animals. These develop to infective stage and move into another host when the mosquito feeds again
