Phylum Platyhelminthes
No description yet. This curated deck is ready for daily study.
Card preview (15)
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