Aschelminthes Flashcards
(45 cards)
name
`nematodes - the round worms
nematode means
pointed ends
general information
bilateral symmetry
triploblastic
pseudocoelom`
unsegmented
body cavity is
pseudocoelom /false coelom
body cavity is
pseudocoelom /false coelom
body cavity is derived from
blastocoel - the fluid filled cavity of blastula
does mesoderm give rise to body cavity
no it doesnt, it give rise to body cavity in coelomates
fluid is present or not
it is present
where
in between body wall and alimentary canal
Digestive system
parasitic round worms- simplifeid digestive system
two openings
which have simplified digestive system
parasitic platyhelminthes and parasitic aschelmenthis
type of digestive system
- tube within a tube-like structure
- anus and a mouth
- anterior mouth and posterior anus
type of digestive system
- tube within a tube-like structure
- anus and a mouth
- anterior mouth and posterior anus
4.
structure of organism
tapering at both ends
type of digestive system
- tube within a tube-like structure
- anus and a mouth
- anterior mouth and posterior anus
4.
do they contain nephridie, metanephridia , protonephridia or none
protonephridia
type of digestive system
- tube within a tube-like structure
- anus and a mouth
- anterior mouth and posterior anus
4.
describe excretory system
two longitudinal canals that join at the anterior end to form a single canal tha opens into exterior through an extrernal opening present on the ventral side of the organism.
they have protonephridia
respiratory system
lack- occurs through body surface
nervous system
- nerve ring
- papillae
- special sensory organs
what is nerve ring
nerve ring of nerve tissue and ganglia is present around the pharynx and give rise to dorsal, lateral, and ventral nerve cords that are connected with transverse cords
are there transverse cords
yes- nbf
are there specialized sense organs in the anterior region of the organism
no, they are present in platyhelmenthis though
