Concept explainers
(a) A quahog clam, cless Bavalvia
(b) A chlton, class Polyplacophora
(c) A snail, class Gastropoda
(d) A nudbranch, class Gastropoda
(e) A blue-ringed octopus, class Cephalopodan
Figure 34.12 Mollusks. (a) A bivalve shell, class Bivalvia, with growth rings. This quahog clam (Mercenaria mercenaria) can live over 20 years. (b) A chiton (Tonicella lineata), a polyplacophoran with a shell made up of eight separate plates. (c) A gastropod, the tree snail, Liguus fasciatus, from the Florida Everglades showing its characteristic coiled shell. (d) A nudibranch (Phyllidia ocellata). The nudibranchs are a gastropod subclass whose members have lost their shell altogether. (e) The highly poisonous blue-ringed octopus (Hapalochlaena lunulata), a cephalopod.
Core Skill: Connections Refer back to Figure 34.12. Which types of antipredator adaptations are possessed by mollusks?
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