Overview L47


snail radula w.m. L51 Fig 7.12; T219 Fig 12.4

mussel glochidia w.m. T267 Fig 12.47f; R65

clam gill c.s. T246 Fig 12.29; R65


external anatomy of:

chiton  L52 & 53 Fig 7.2(e)7.7; T221 Fig 12.6c mouth, pallial groove (= mantle cavity), foot, shell valves, gill

snail  L54 Fig 7.13; T226 Fig 12.10; T232 Fig 12.15 – tentacles, eye, foot, mouth, pneumostome (outside opening of the gas exchange structure in pulmonate snails and slugs)

freshwater mussel  L55 & 56 Fig 7.14 & 7.18 – umbo, right valve, left valve, hinge, ligament, anterior, posterior, dorsal, ventral

squid  L58 Fig 7;31; T258 Fig 12.39a – dorsal, ventral, anterior, posterior, arm, tentacle, jaw, eye, mantle, fin, siphon (= funnel)


internal anatomy of:

squid L58 Fig 7.287.30; T258 & 259 Fig 12.39(b-c) tentacles, funnel, mantle, brain, beak, gill, pen, stomach, ink sac, gonad

Questions for your lab notebook:

The body of molluscs is divided into two main regions called the _____________ and the_____________.


Briefly explain coiling in a gastropod. What is its significance?



How is a pearl formed?



What is an example of convergent evolution between a squid and a human?



What are 3 ways that cephalopods differ from the other molluscan classes?



Is a glochidium a free living or a parasitic stage?