Phylum Platyhelminthes Flashcards
Common name
Flatworms
Subphyla Catenulida
Chain worm
Low diversity
Subphyla Rhabditophora
Rod like
Most flatworms
Symmetry
Bilateral
First trophoblastic- endoderm, ectoderm, and mesoderm
Free living or parasitic?
Both
Organ systems
GVC with 1 opening and pharynx
No circulatory system
Nervous system with ganglia
Excretory system
Nutrition
GVC one opening with pharynx
Phagocytosis
Extracellular
Excretory system
Osmoregulation
2 tubules
Flame cells propel waste to be eliminated from mouth
Cephelization
Central nervous system with ganglia
Light sensitive eyespots
Auricles for touch, taste, and smell
Directional movement
Reproduction
Most Monoecious- sexual reproduction.
Regenerative ability
Class Turbellaria
“Hammerhead worm”
Free living
Most marine, some freshwater and terrestrial.
Class Monogenea
One specific species host fluke
Ectoparasites on fish gills
Class Trematoda
Endoparasitic: 2 host fluke
1) Intermediate host: mollusks
2) Terminal host: vertebrates
Complex life style
Class Cestoda
Tapeworm
Endoparasites on vertebrates
Immediate hosts: raw meat, intestines, fecal contamination
Parts:
1) scolex: attachment zones
2) neck: unsegmented
3) Proglottids: repetitive hemaphroditic sections
Flame cells
Water balance
Excretion
