18 Questions
What is the function of the hinge ligament in bivalve shells?
To draw the valves together using adductor muscles
Where is the umbo located in a bivalve shell?
As the oldest part of the shell
Where are gland cells located that secrete mucus to entangle particles in bivalves?
On the labial palps
How do scallops and file shells move?
By creating a jet propulsion by clapping their valves
What is responsible for producing pearls in bivalves?
An irritant lodged between the shell and mantle
What is the function of the crystalline style in bivalve digestion?
To secrete digestive enzymes
In bivalves, how is food directed into the mouth for ingestion?
By sliding down food grooves at the edge of gills
Where does fertilization usually occur in bivalves?
In the suprabranchial chamber
What is the role of nephridial tubules in bivalve circulation?
Regulation of water balance
What is the purpose of the three-chambered heart in bivalves?
To pump blood to the gills
How do glochidium larvae complete their development?
By attaching to gills of passing fish
Where do juveniles of glochidium larvae usually detach and begin independent life?
On the substrate after encysting on a host
Which type of larval stage is hatched with the beginnings of a foot, shell, and mantle in many gastropods and bivalves?
Veliger larva
What class has over 70,000 living and more than 15,000 fossil species, including marine snails, limpets, slugs, whelks, and sea slugs?
Class Gastropoda
What is the characteristic feature of gastropod shells in terms of coiling formation?
Dextral (right-sided)
Which type of larvae do cephalopods, some freshwater bivalves, and snails lack?
Veliger larva
What is the smallest and oldest part of the whorl in a gastropod shell?
Apex
What is the function of the operculum in many snails in relation to the shell?
Covering shell aperture (entry)
Test your knowledge on Class Bivalvia and Bivalve Shells by answering questions about their characteristics, anatomy, and pearl production process.
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