1Name all the classes from Phylum Mollusca?
Polyplacophora, Gastropoda, Bivalvia, Cephalopoda
2Describe the Class Polyplacophora's "shell"...
Chiton plates are partially or completely covered by the mantle in some species, shell is composed of 8 dorsal plates.
3Describe Polyplacophora respiration:
Numerous gills all along the sides in an elongate mantle cavity called the pallial groove.
4Describe Class Gastropoda:
Most have a coiled/whorled shell, formed through a developmental process called torsion. Some have no shell or flat shells.
5Shells with the aperature on the ____ (when apex up) are ____; if its on the ____, they're ____.
right, dextral, left, sinistral.
6Give an example of Class Gastropoda with flat shells, no shell?
Limpets and abalone, Slugs and nudibranchs.
7What do nudibranches do to cnidarians?
Many nudibranchs eat cnidarians and sequester the nematocysts for personal use.
8Name the 3 major groups of Class Gastropoda:
Prosobranch, Opisthobranch, Pulmonate
9Describe Prosobranchs...
Most of the marine snails, moon snails, conch, limpets, whelks, abalone.
10Describe Pulmonates...
Most of the terrestrial and freshwater snails, No gills, has a highly vascualar area of mantle that works as a lung.
11How do cone snails from Class Gastropoda hunt?
A large modified radula tooth shaped like a harpoon, is used to inject venom into prey.
12Describe class Bivalvia:
Clams, oysters, scallops, mussels, no head or radula, filter feeders
13Describe the anatomy of Class Bivalvia...
Umbo points anteriorly and is the oldest part of the shell, Foot is hatchet shaped and used for digging. Has 2 tubes called incurrent and excurrent siphons.
14Describe Class Cephalopoda...
Nautilus, Squid, Cuttlefish, Octopus, all marine and predatory.
15Describe the modified body form of the Cephalopod, specifically "Foot".
Dorsal part of foot forms several arms or tentacles. Ventral part of foot forms a siphon that drains the mantle cavity.
16Describe the modified body form of the Cephalopod, specifically "Mantle".
Mantle is muscular and used for propulsion by jetting water out the siphon.
17Describe the modified body form of the Cephalopod, specifically "Eye and Skin".
Have very complex eyes like vertebraes, convergent evolution. Have rapid control of chromatophores in skin to change color and patterns.
18Describe the modified body for of the Cephalopod, Specifically "Mouth".
Has beak-like, chitinous jaws for biting off pieces of food and delivering venom in some, Radula is present in most and used to chew.
19What is the name of the cephalopod with an external shell?
Nautilus
20How does a Nautilus control its buoyancy?
By changing the amounts of fluid and gas in their shell chambers via a siphuncle.
21Do cuttlefish have any form of shell?
Internal shell, Calcareous cuttle bone has many small chambers.
22How are cephalopods unique among molluscks?
Closed circulatory system.