Lab 10 Flashcards
What is the basic body plan of all mollusks
mantle, foot, and visceral mass
A space through which water or in some cases air circulates
mantle cavity
Vascularized filamentous projections derived from the mantle are housed within the mantle cavity and function as gills in aquatic species (respiratory structures)
Ctenidia
The reproductive, digestive, and excretory organs of mollusks
visceral mass
Most mollusks have a ___ that is secreted by the outer surface of the mantle
shell
A typical shell consists of two layers of _____ covered by an organic layer of the protein _____
calcium carbonate
conchin
The shell consists of three layers
Periostracum = conchin protein
Prismatic layer = calcium carbonate
Nacreous layer = mother of pearl
Protects the inner calcium-rich layers from erosion
Periostracum shell layer
The smooth mother-of-pearl, inner surface that is secreted continuously by the mantle
Nacreous shell layer
Between the periostracum and the nacreous layer lies the ___ which is made of densely packed crystals of calcium carbonate
Prismatic shell layer
Members of this class are commonly called Chitons, are grazing herbivores found primarily in shallow marine environments
Class Polyplacophora
A hard grooved surface that the animals use to scrape and grind algae off of rocks and other surfaces
Radula
The two jobs of the mantle are
To house and give rise to the resp tissues
To secrete the shell
This class includes clams, mussels, oysters and scallops
Class Bivalvia
A bump off to one side of the hinge of a clam, always on the anterior side
Umbo
Control the opening and closing of the clam shell
adductor muscles
Inside a clam the walls of the gill known as the ___ give the gill its ribbed appearance
lamellae
The muscular hatchet shaped structure near the anterior of the clam
Foot
Where the gills of the clam connect
suprabranchial chamber
Inside a clam, pairs of flaps that help direct food that was collected ion the gills toward the mouth
labial palps
This class includes limpets, snails, slugs, and nudibranchs
Class Gastropoda
Gastropods starts out as bilaterally symmetrical but during embryonic development they undergo ___ asymmetric growth that repositions the mantle cavity and anus
torsion
This class includes squid, octopus, cuttlefish, and nautilus
Class Cephalopoda
The foot of class Cephalopoda is unique in that it has developed into
a ring of arms and tentacles which are usually covered with suction cups
The squids body is spotted due to the presence of pigmented bodies called
chromatophores
The eight short appendages of the squid are ___ and the two long appendages are ____
arms
tentacles
At the base of each gill of the squid is a ____ tht pumps blood into the gills
branchial heart
In a squid, oxygenated blood returns to the ___ via the branchial vein
systemic heart
IN contrast to other mollusks cephalopods have a
closed circulatory system
If your squid specimen was female the most obvious feature was a pair of large white ___ located centrally in the mantle cavity
nidamental glands
