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Animal Lab Exam
Lab 3
32
Biology
Undergraduate 2
04/03/2012

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Term
Mollusca Classes
Definition
Class Caudofoveata (worm-like)
Class Monoplacophora
Class Polyplacophora (chitons)
Class Scaphopoda
Class Gastropoda (snails, slugs, whelks)
Class Bivalvia (Oysters, mussels, clams)
Class Cephalopoda (squids, octopus, nautilus)
Term
Chitons Classification
Definition
Phylum Mollusca
Class Polyplacophora
Family Mopaliidae
Genus Chaetopleura (italics)
Term
Chiton shell consists of
Definition
8 overlapping dorsal plates secreted by mantle
Term
Function of chiton foot
Definition
locomotion and attachment
Term
Bivalves Classification
Definition
Phylum Mollusca
Class Bivalvia (two valves)
Order Schizodonta
Genus Anodonta
Term
Clam hinge ligament
Definition
attach the two valves of the shell
Term
umbo
Definition
oldest part of the shell
Term
periostracum
Definition
outer horny layer of the valve
Term
which side is the hinge on in clams?
Definition
dorsal side
Term
where are the siphons located on clams?
Definition
posterior end
Term
function of adductor muscles in clam
Definition
close the valves
Term
function of retractor muscles in clam
Definition
withdraw the foot
Term
function of protractor muscles in clam
Definition
compresses visceral mass to extend foot
Term
function of labial palps in clam
Definition
attached to anterior end of visceral mass
left and right labial palps join anteriorly to form a protective lip for the slitlike mouth
palps secrete a great amount of mucus and are ciliated to guide food trapped in the mucus towards the mouth
Term
clam respiration occurs in...
Definition
mantle cavity and gills
Term
Reproductive system of clams
Definition
gonads discharge gametes into suprabranchial chamber
spermatozoa carried into surrounding water and enter female with inhalant current and fertilize eggs in suprabranchial chamber
bivalved larval form = glochidium
Term
bivalved larva form of clam
Definition
glochidium larva
Term
Class Gastropoda
Definition
Phylum Mollusca
Class Gastropoda
Order Stylommatophora
Genus Helix (italics)
Term
to what part of the clam shell does the snail apex correspond?
Definition
umbo
Term
Dextral shell
Definition
right handed shell
apex of shell upward and aperture pointing you, aperture should be on right side
Term
Sinistral shell
Definition
left-handed shell
apex of shell upward and aperture pointing you, aperture should be on left side
Term
Three shell layers
Definition
1. outer periostracum
2. prismatic layer
3. nacre layer
Term
pneumostome
Definition
opening on shell
opens into highly vascular portion of the mantle cavity, important for respiration in terrestrial snails
Term
radula
Definition
series of teeth attached to ribbon-like organ that moves rapidly back and forth with a rasping action
Term
Squid Classification
Definition
Phylum Mollusca
Class Cephalopoda
Order Decapoda
Genus Loligo (italics)
Term
Ventral side of squid
Definition
head region with tentacles that represent modification of the foot
Term
function of muscular funnel/siphon in squid
Definition
water forced through funnel by muscual contraction of the mantle furnishes the power for "jet propulsion" locomotion
Term
Ctenidia
Definition
squid gills
Term
squid nidamental glands
Definition
found in the female
large white glands that secrete the outer capsules of egg masses
Term
Respiratory and circulatory systems of squid
Definition
branchial hearts at the base of each gill
blood from branchial hearts carried to gills by afferent branchial vein and returned by efferent branchial vein to the systemic (true) heart which lies between the branchial hearts
Term
Skeletal system of squid
Definition
chitinous pen lies ventral to the visceral organs
Term
Type of body cavity in Mollusca?
Definition
Coelom/pericardial cavity
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