CHM 2045 Lecture Notes - Lecture 3: Cerata, Coleoidea, Cephalopod
The structure that is used for locomotion and has great variety among Molluscs is: foot
The structure that is used for ingestion that tears and grates food items is: radula
The part of a mollusc that contains the internal organs is the: visceral mass
The structure that produces the shell in molluscs is the: chromatophore
The larval stage common to all Molluscs is the: trochophore
The structure that supplies the muscles of the foot with nerve impulses for movement is the:
pedal cord
The structure that plugs the opening to a snail's shell is the: operculum
The class of molluscs that contain the slugs,whelks, and snails is the: Gastropoda
The class of molluscs that contain the clams and oysters is the: Bivalvia
The class of molluscs that contain octopi and squid is the: Cephalopoda
The class of molluscs that lack cephalization and are filter feeders is the: Bivalvia
The class of molluscs that contain the chitons is the: Polyplacophora
What animal is an example of an errant polychaete?: bearded fireworm
Chitons, scaphopods, gastropods, bivalves, and cephalopods all belong to the phylum:: Mollusca
Animals covered by eight overlapping plates on their dorsal surface are: chitons
Which layer of the molluscan shell is secreted continuously? (Responsible for forming pearls):
nacreous layer
_______ possess a soft body covered with a mantle: Molluscs
Nudibranchs belong to the class___ of the phylum Mollusca: Gastropoda
Molluscs that do not possess a radula: Bivalves
What is the class for the scaphopods?: Scaphopoda
The visceral mass of molluscs does not contain the: head-foot
The outermost layer of the molluscan shell that is composed of the protein conchiolin?:
periostracum
The most common marine annelids are: polychaetes
Nudibranchs have ____ on their surface for gas exchange.: cerata
Bivalves can be soft-bottom burrowers. Another name for soft-bottom burrowers is: infauna
Nautiloids and coleoids are apart of which class?: Cephalopoda
In nautiloids, shelled cephalopods, the structure where food is temporarily stored is called?: crop
How do molluscs move?: fin undulation, Using tentacles to crawl, and jet propulsion
Ecological role of molluscs: food for humans and animals, hosts to parasites, and break down
wood in marine ecosystem
Solitary benthic worms that live in burrows are called?: sipunculids
Compartment contained fluidproviding support to annelid worm body is called?: hydrostatic
skeleton
All of the following are types of annelids except? polychaetes, ribbon worms, echiurans,
pogonophorans: ribbon worms
Which type of polychaete is sessile?: sedentary polychaetes
What type of organism are fish?: Vertebrates
Name the class of jawless fish: Mixini
What structure helps identify a MALE shark?: claspers
Hagfish are also known as?: Slime eels
Most bony fish have which specialized structure for buoyancy?: swim bladder
The earliest fish are represented today by?: hagfish and lamprey
Sharks obtain neutral buoyancy by producing an oil called?: squalene
