Chap 27 Flashcards
Which mollusks have a closed circulatory system?
Cephalopods. (Octopi and Squid)
Class Gastropoda.
Most move by means of a muscular foot. (Snails and land slug)
Class Bivalvia.
2 shells that are hinged together at the back. (Clams, Oysters, and Scallops.
Class Cephalopoda.
Head is attached to its foot. (Cuttlefish, nautiluses)
Phylum Annelida.
Earthworms. Coelom. Closed circulatory system.
Nervous system of Annelids?
Dorsal brain, ventral nerve cord, segmented nerves, pair of ganglia
Annelid excretion?
A pair of nephridia in each segment get rid of nitrogenous waste.
Prostomium.
Upper lip of Annelids that pushes food into the mouth.
What characteristics so many mollusks and Annelids have in common?
Trochophore larvae.
What is found in mollusks and Annelids but not in round worms?
A circulatory system and a excretory system.
Which mollusks have an open circulatory system?
Bivalves and Gastropoda.
