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Chapter 10
n/a
41
Biology
Undergraduate 1
05/03/2015

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Term
How many living species in Mollusca
Definition
90,000
Term
Fossil species of mollusca
Definition
70,000
Term
Head-foot
Definition
Feeding, cephalic sensory and locomotor organs
Term
Visceral mass
Definition
contains digestive, circulatory, respiratory, and reproductive organs
Term
Mantle
Definition
Two folds of skin
Term
Mantle cavity
Definition
Space between mantle and body
Term
Mantile cavity houses the
Definition
Gills/lung
Term
Radula
Definition
Unique to molluscs; rasping, tongue like organ
Term
The radula is found in all molluscs except
Definition
Bivalves, some gastropods, and some solenogasters
Term
Exposed surface of mantle functions in
Definition
Gaseous exchange
Term
Shell
Definition
Secreted by mantle
Term
Periostracum
Definition
Outer organic layer composed of conchiolin
Term
Middle prismatic layer
Definition
Prisms of calcium carbonate
Term
Inner nacreous layer
Definition
Layer laid down in thin layers, secreted by mantle
Term
Most molluscs are ____, reproduction wise
Definition
Dioecious
Term
Regarding reproduction, some gastropods are:
Definition
Hermaphroditic
Term
Veliger
Definition
Intermediate larval stage
Term
Class Polyplacophora
Definition
Chitons
Term
Class Scaphopoda
Definition
Tusk/tooth like shells
Term
Class gastropoda
Definition
Snails, slugs, conches, sea slugs, periwinkles
Term
Operculum
Definition
Protects and prevents water loss
Term
Pneumostome
Definition
Small opening to which lungs open to
Term
Hinge ligament
Definition
Holds two shells/valves together
Term
Adductor muscles
Definition
Draws shells/valves together
Term
Valves are ______ when adductor muscles relax
Definition
Open
Term
Umbo
Definition
Oldest part of the shell
Term
Regarding reproduction, bivalva is usually
Definition
dioecious
Term
Spat
Definition
Larvae in bivalva
Term
Glochidia
Definition
Specialized veliger that attaches to gills of fish to live as a parasite
Term
Freshwater clams fertilize:
Definition
internally
Term
Class Cephalopoda
Definition
Squids, octopuses, nautiluses, and cuttlefish
Term
Cephalopod
Definition
Foot in the head
Term
Siphuncle
Definition
Cord of living tissue
Term
Pen
Definition
Squid shell
Term
Squid and cuttlefish have_______ (arms/tentacles)
Definition
8 arms with suckers, 2 tentacles
Term
Octopuses have ______ (arms/tentacles)
Definition
8 arms with suckers
Term
Most complex of any invertebrate
Definition
Cephalopod brain
Term
Chromatophores
Definition
Cells in the skin that expand and contract
Term
Ink sac
Definition
Empties into rectum and secretes
Term
Cephalopods swim by
Definition
Forcefully expelling water through siphon
Term
Cephalopods are, reproductively speaking
Definition
dioecious
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