Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
48 Cards in this Set
- Front
- Back
|
Another word for class Polyplacophora
|
Chitons
|
|
|
The five classes of Mollusca we're concerned with?
|
-Polyplacophora
-Gastropoda -Cephalopoda -Bivalvia -Scaphopoda |
|
Label/What is it?
|
a Hypothetical Ancestral Mollusca
(a.k.a. HAM) |
|
Label
|
|
|
|
outer layer of Molluscan shells?
|
periostracum
|
|
Label/What is it?
|
Trochophore larva
|
|
Label
|
|
|
|
Mollusca are _______ symmetrical animals.
|
bilaterally
|
|
Label/Class?
|
Polyplacophora - (chitons)
|
|
Label/Class?
|
Polyplacophora
|
|
Label/Class?
|
Polyplacophora
|
|
|
chemosensory organ of Mollusca?
Where is it located? |
osphradium
posteriorly |
|
Label/Class?
|
|
|
|
What class do clams belong to?
|
Bivalvia
|
|
Label
|
|
|
|
Elevated portion of a bivalve shell that indicates the origin from which the mantle began to produce the shell?
Which was is it oriented? |
Umbo
Pointed anteriorly. |
|
|
Foot of a bivalve is located on the _______ surface
|
ventral
|
|
|
Incurrent siphon is always located _____.
Excurrent siphon is always located ______. |
ventrally
dorsally |
|
|
The pallial line marks the former attachment of the ______ to the shell.
|
mantle
|
|
Label/Class
|
Bivalvia
|
|
|
What are the two pairs of gills (inner/outer) each called?
|
Demibranchs
|
|
|
3 Functions of the gills in Bivaliva
|
Reproduction
Respiration Food gathering |
|
Label/Class?
|
Bivalvia
|
|
Label/Class?
|
Bivalvia
|
|
|
The water from the excurrent siphon is the outflow of water from each of the four ________________.
|
suprabranchial chambers
|
|
Label/Class?
|
Cephalopoda
|
|
Label/Class?
|
Cephalopoda
|
|
|
In the squid, what structure is the remnant of the HAM shell?
|
the Pen
|
|
|
The heart of squid (cephalopoda) involved in pulmonary circulation
|
branchial heart
|
|
|
The heart of squid (cephalopoda) involved in systemic circulation?
|
systemic heart
|
|
|
How many arms surround the mouth of the squids?
|
10 (8 of similar length + 2 tentacles)
|
|
|
A modified tentacle for transferring sperm in squid?
|
hectocotylus
|
|
Label/Class?
|
Cephalopoda (Particularly squid)
|
|
|
The axis around which the whorls are wound in a Gastropoda?
|
The Columella
|
|
|
If the opening of a Gastropoda shell is situated on the right when facing you, it is _________ coiled.
|
Dextrally
|
|
|
If the opening of a Gastropoda shell is situated on the left when facing you, it is _________ coiled.
|
Sinestrally
|
|
|
The radula is applied to the ______, which helps the radula to contract.
|
odontophore
|
|
Label/Class?
|
Gastropoda
|
|
|
The twisting of the mantle cavity and its contents 180 degrees from the posterior of the animal to the anterior (Gastropoda)
|
Torsion
|
|
|
Define detorsion and in what animals it has occurred.
|
Torsion has taken place and then reverted 90 degrees. (slugs, freshwater snails, terrestrial snails)
|
|
|
How can we tell that detorsion has taken place?
|
The opening of the shell is on the right side of the animal.
|
|
|
Opening through which air can enter the mantle cavity of a snail (gastropoda)?
|
Pneumostome
|
|
|
Be careful! With detorsion, the _______ ends up ___________.
|
Right lung... on the left side
|
|
Label/Class?
|
Gastropoda
|
|
|
3 Major groups of snails? (Class?)
|
Pulmonates (Gastropoda)
Opisthobranchs Prosobranchs |
|
|
Characteristics of Pulmonate snails?
|
Land snails, slugs; freshwater snails
No gills; "lung" |
|
|
Characteristics of Opisthobranchs? (Class?)
|
(Gastropoda)
-Mostly marine; shallow water -Usually 2 pair of tentacles; shell reduced or absent -Sea slugs, sea hares; all monoecious |
|
|
Characteristics of Prosobranchs? (Class?)
|
(Gastropoda)
-Most marine snails;1pr of tentacles -Mantle cavity anterior as result of torsion -Frequently have operculum |
