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43 Cards in this Set
- Front
- Back
Molluscs are
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Lophotrochozoans
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There are roughly this many described species in the phylum Mollusca.
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100,000
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The study of similarities and differences in early development of animals is called...
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Comparitive embryology
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The entercocoel hypothesis suggests the coelom may have arisen...
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As outpocketings of the primitive gut
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The body of molluscs is divided into two main regions calls the...
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Head-foot and visceral mass
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The shell of a mollusc is secreted by the...
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Mantle
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The inner layer of the mollusc shell is the ________ layer.
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Nacreous
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The space between the mantle and foot in a mollusc is called the....
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Mantle cavity
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The rasping structure occurring in the mouth of most molluscs is the...
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Radula
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Snails, slugs, and limpets belong to the molluscan class...
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Gastropoda
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The 180 degree counter clockwise twisting of visceral mass, mantle, and mantle cavity of gastropods is called...
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Torsion
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In gastropods, food is trapped in mucus and incorporated into a rotating mucoid mass called the ___________, which extends to the stomach.
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Protostyle
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The class of molluscs that contains the most species is the class...
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Gastropoda
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The circulatory system of most molluscs is...
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Open.
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Among molluscs, extension of body stuctures such as tentacles is accomplished by...
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A hydraulic skeleton.
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In some gastropods, a(n) __________ is found on the dorsal, prosterior margin of the foot and when the foot is drawn into the shell, seals the opening.
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Operculum
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The primary excretory product of aquatic gastropods is...
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Ammonia
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The gastropod larval stage in which torsion occurs is called the....
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Veliger
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What is not a member of the class Bivalvia?
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Chitons
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The oldest part of the bivalve shell is the...
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Umbo
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Muscles responsible for closing the bivalve shell are...
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Adductors
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The adaptation of bivalves to sedentary, filter feeding life-styles involved loss of the ___________ and the radula.
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Head
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In the bivalves, gas exchange takes place through the...
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Gills
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In the bivalves, final digestion occurs...
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In the digestive gland
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The modified veliger of some freshwater bivalves is called the...
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Glochidium
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Squids, octopuses, cuttlefishes, and nautili belong to the molluscan class...
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Cephalopoda
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The most complex molluscs belong to the class...
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Cephalopoda
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The only Cephalopods that possess an external shell are the...
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Nautiloids
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Unlike other molluscs, the ___________ have a closed circulatory system.
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Cephalopods
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Cephalopods typically locate prey by...
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Sight
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The similarity of design between the eyes of vertebrates and the eyes of many cephalopods provides an excellent example of...
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Convergent evolution
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Pigment cells of cephalopods are called...
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Chromatophores
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Sperm packets of cephalpods are called...
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Spermatophores
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Tooth shells belong to the molluscan class..
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Scaphopoda
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Neopilina represents and molluscan class __________, that was known only from fossils until 1952.
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Monoplacophora
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Solenogasters are cylindrical molluscs that lack a shell; they belong to the class...
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Aplacophora
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Chitons belong to the molluscan class...
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Polyplacophora
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The lack of a ___________ in the molluscan class Aplacophora is thought to be a primitive characteristic.
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Shell
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The segmental arrangement of gills, excretory structures, and nervous elements in the __________, make them seem like a "missing link" between molluscs and the annelid-arthropod line.
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Monoplacophorans
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The diversity of body forms and life-styles in the phylum Mollusca is an excellent example of...
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Adaptive radiation
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The shell-secreting organ of bivalve mollusks is the...
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Mantle
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The tentacle of male cephalopods that is modified for spermatophore transfer is the...
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Hectocotylus
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Molluscs possess this type of skeleton.
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Hydraulic
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