nematodes Flashcards
estimated number of species of nematodes
500,000
general morphology of nematodes
nonsegmented
cylindrical
bilaterally symmetrical
tapered at both ends
covered by cuticle
complete digestive tract
no circulatory system
sexes are separate
majority are free living
tough protective covering made up of chitin
cuticle
t/f
females are smaller than males
f (males are smaller)
nematodes can be divided into two classes based on the presence of __
chemoreceptors
two classes of nematodes
class phasmidia
class aphasmidia
possesses caudal chemoreceptors
class phasmidia
lacks caudal chemoreceptors
class aphasmidia
anterior or cephalic sensory organs
amphids
esophagus is uniform throughout
filariform
esophagus expansion posteriorly into a bulb with a valve mechanism
rhabditiform
t/f
nematodes have longitudinally oriented muscles important for locomotion
t
three types of musculature of nematods
polymyarian
meromyarian
holomyarian
type of nematode with more than five rows of cells
polymyarian
type of nematode with two to five rows
meromyarian
type of nematode with less than two rows
holomyarian
female nematodes have __ , __ , __ , __
two cylindrical ovaries, uterine, vulva, vagina
male nematodes posess __ or __
a pair of copulatory spicules, thin-walled copulatory bursa
t/f
eggs does not vary
f (eggs vary in size and shape)
__ larva is the stage that hatches from the egg
rhabditiform
third stage larva
filariform
infective form of parasites
filariform larvae
nematodes MOT
ingestion
larva
skin penetration
inhalation
transmammary
vectors
nematodes transmitted through ingestion
a. lumbricoides
t. trichiura
e. vermicularis
