Lab 3 - Mollusca Flashcards
What makes up the basic body plan of the mollusk?
Head (occasionally), visceral mass, foot, and mantle
What does the head contain?
Mouth, tentacles, and eyes
What does the visceral mass contain?
Heart, gonads, intestines, kidneys, disgestive system
What kind of coleom do Mollusks have?
Eucoleoms (coleomate)
What is the function of the foot?
Anchorage and movement
What is the function of the mantle?
Secreting the shell and gas exchange
Mantle cavity houses…
Houses the gills
Pericardia
Coleomic chambers where the heart, gonads, and kidneys are stored
What kind of circulatory system do they have and what features does it have?
All except cephalopodia have open circulatory systems, with the “heart” being the hemocel
Clades within Mollusca
Aculifera and Conchifera
Taxa within Aculifera
Polyplacophora
Taxa within Conchifera
Gastropodia, Cephalopodia, Schaphopodia, Bivalvia
Characteristics of Gastropodia
Spiraling, torsion, anus above head
Cephalopodia Synapomorphy
Loss or lack of the shell, Lobed foot, highly developed head
Scaphopodia Synapomorphy
Ventral valve fusion, used for gas exchange, no gills
Bivalvia Synapomorphy
Dorsal hinge and two valves (shells)
Polyplacophora synapomorphy
Eight valved/plated shell
What is radula?
Structure with teeth on the odontophore (cartilage) that move due to odontophore and radula protractor and retractor muscles that is used for feeding, scraping
Which class has specialized and well developed eyes?
Gastropoda
Ctendia
the gills of bivalvia, used for filter feeding
Captacula
Long tentacles covered by cilia and mucus in Scaphopoda
What is the beak made of in cephalopodia
Keratin
Function of the pen
Provides support to squid, reminant of shell
Special charactaristics of squid
Siphon to push out water and ink, one systemic heart and two branchial hearts,
