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Fig. 13-12, p. 268
An immature female specimen of the squid researchers are calling Mesonychoteuthis hamiltoni the "colossal squid". (April 2003)
Cephalopod Mollusks
• Pelagic = squid, cuttlefish, chambered nautilus
• (benthic = octopus)
• Foot modified into tentacles
• Active predators
• Highly evolved nervous system
• Largest of the invertebrates (59 ft squid)
Vertebrates:Cartilaginous Fish –
• Skeletons made of cartilage• skates, rays
– more benthic
– Dorsoventrally flattened
• sharks – More pelagic
– Torpedo shaped and streamlined
Cartilaginous Fish
• skeletons made of tough elastic cartilage
• negatively buoyant– Use fins for lift– Store oil in liver
• Gill slits are visible
• some of the active sharks must swim to breathe
Marine Reptiles
• ectothermic
• covered with scales
• breathe air with lungs,
• have specialized salt glands to excrete excess salt taken in from seawater
Vertebrates: Marine Birds
• Albatrosses, pelicans, gulls, terns, puffins and penguins
• are endotherms
• have feathers
• also have salt secreting glands