Helminth Comparison
Characters
Common Name
Symmetry
Germ Layers
Coelom
Digestive
Circulatory
Excretory
Musculature
Reproduction
Larvae
Classes
Platyhelminthes
Nemertea
Nematoda
Annelida
Pogonophora (annelid)
flatworms
bilateral
triploblastic
acoelom
incomplete (lack anus)
primitive
protonephrida (flame)
circular/longitudinal
mostly monoecious/dioecious
miracidium/redia/cercaria
TTC (Tiny Tim’s Christmas)
Turbellaria
Trematoda (flukes)
Cestoda (tapeworms)
ribbon worms
bilateral
triploblastic
acoelom
complete
true
protonephrida (flame)
circular/longitudinal
dioecious
pilidium
Not important
roundworms
bilateral
triploblastic
pseudocoelom
complete
none
renette cells??
only longitudinal
mostly dioecious
direct to juveniles
Not important
But need to know
general names like
trichinella
pinworms
hookworms
Intestinal worms
heart worms
eye worms
filarial worms
(elephantiasis)
dracuncloids
guinea worm
(caduceus:
symbol of medicine)
segmented worms
bilateral
triploblastic
eucoelom (true)
complete
true & advanced
metanephridia
circular/longitudinal
dioecious/monoecious
trochophore
POH
(Point of Hallucenation)
Polychaeta
Oligochaeta
Hirudinea (leeches)
bearded worms
bilateral
triploblastic
eucoelom
no gut
true & advanced
???
circular/longitudinal
Dioecious
trochophore
Not important