Phylum Hemichordata Flashcards
Phylum Hemichordata
Common name?
Acorn worms and Pterobranchs
Phylum Hemichordata
Germ layer
Triploblastic: coelomate
Phylum Hemichordata
Digestive tract?
Complete
Phylum Hemichordata
Respiratory structure?
Ciliated pharyngeal gill slits
Phylum Hemichordata
Feeding behavior?
Filter / Suspension feeding
Phylum Hemichordata
Excretory structures?
No specialized structures
Phylum Hemichordata
Skeleton type?
Hydrostatic skeleton
Phylum Hemichordata
Symmetry?
Bilateral symmetry
Phylum Hemichordata
Nervous system
Dorsal solid nerve cord
No ganglia
Phylum Hemichordata
Circulatory system?
Open circulatory system
1 or 2 contractile vessels
Phylum Hemichordata
What are the 3 body regions?
Proboscis
Collar
Trunk
Phylum Hemichordata
Acorn worm proboscis function?
Filter feeding
Phylum Hemichordata
Pterobranchs proboscis function?
Secretes a worm tube for protection
Phylum Hemichordata
Collar function?
Protect the mouth
Phylum Hemichordata
Trunk function?
Life’s processes
Phylum Hemichordata
Living environment?
Marine
Phylum Hemichordata
Supergroup?
Deuterostomia
Phylum Hemichordata
Class Enteropnuesta
Common name?
Acorn worms
Phylum Hemichordata
Class Enteropnuesta
Circulatory system?
Open
2 pumping structures
Phylum Hemichordata
Class Enteropnuesta
Dorsal pump structure pumps blood to?
Anterior circulation
Phylum Hemichordata
Class Enteropnuesta
Ventral pump structure pumps blood to?
Posterior circulation
Phylum Hemichordata Class Enteropnuesta Monoecious/Dioecious? Fertilization type? Larvae motility?
Dioecious
External fertilization
Motile larvae
Phylum Hemichordata
Class Pterobranchia
Common name?
Pterobranchs
Phylum Hemichordata
Class Pterobranchia
Feeding behavior?
Filter-feeding via tentacles + cilia
