GROUPS OF MOLLUSCS The three major classes of mollusks are - PowerPoint PPT Presentation

Nov 05, 2022 •386 likes •449 views

GROUPS OF MOLLUSCS The three major classes of mollusks are Gastropods Bivalves Cephalopods GASTROPODS Class Gastropoda Pond snails, land slugs, limpets, nudibranchs Shell-less or single-shelled Move by using a

GROUPS OF MOLLUSCS • The three major classes of mollusks are • Gastropods • Bivalves • Cephalopods
GASTROPODS • Class Gastropoda • Pond snails, land slugs, limpets, nudibranchs • Shell-less or single-shelled • Move by using a muscular foot located on the ventral side. • Many gastropods have a single shell that protects their bodies. • When threatened, they can pull completely into their shells. • Shell-less gastropods protect themselves in other ways • Releasing ink, chemicals, hiding
• Class Bivalvia BIVALVES • Bivalves have two shells that are held together by one or two powerful muscles. • Common bivalves include: • Clams • Burrow in mud or sand • oysters • Mussels • Attach to rocks • Scallops • Least sedentary • Move around rapidly by flapping shells
• Class Cephalopoda CEPHALOPODS • Octopi, squids, cuttlefish, nautiluses • Cephalopods • Soft-bodied mollusks • Head is attached to a single foot • The foot is divided into tentacles or arms • 8 or more tentacles equipped with sucking disks that grab and hold prey
• Cephalopods have complex sense organs • Detect and respond to external stimuli • Distinguish shapes by sight, texture by touch • Eyes are as complex as some vertebrates • Can be the size of a dinner plate • Can distinguish objects as small as 0.5 cm away

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