PHYLUM NEMATODA (roundworm) Flashcards
(19 cards)
morphology
unsegmented, elongated, cylindrical worms
are they dioecious?
YES
Who is smaller?
Male –> curved or coiled posterior portion
the supporting body wall consist of what?
- cuticle (hyaline and non-cellular)
- subcuticular epithelium/ hypodermis
- somatic musculature
function of subcuticular epithelium/ hypodermis
responsible for the secretion of the cuticle
3 parts of the cuticle
- Cortical layer – outermost layer composed of collagen and cuticulin
- Homogenous matrix – the middle layer
- Fibrous layer
somatic musculature contains what?
layer pf muscle cells
platymyarian & coelomyarian
where does the digestive, excretory and reproductive system reside?
pseudocele/ pseudocoeleum
what is the fluid in the pseudocele called and what is it’s function?
hemolymph - fulfills the function of blood
digestive tract consist of?
mouth buccal cavity esophagus intestine rectum
located at the anterior end; maybe equipped with hooks,teeth, plates and other structures for the purpose of abrasion, attachment and sensory response
Mouth
tubular or funnel-shaped, which in some species is expanded for sucking purposes
Buccal cavity
types of esophagus
filariform rhabditiform sipuroid strongyllifrom stichosoma
simple, long and slender
filariform
ex. strongyloides
divided into distal corpus, an isthmus and esophageal bulb
rhabditiform
ex. enterobius
anterior portion muscular, posterior glandular
sipuroid
ex. filairal worms
short, muscular with a waist
strongyllifrom
ex. ancylostoma
long, thin, capillary-like lined with esophageal glands cells known as
stichocytes or stichosomes
stichosoma
ex. trichuris, trichinella and capillaria
absorbs nutrients and plays a role in excretion of nitrogenous waste
intestine/ midgut
