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Mollusca
- mollis = soft
- 100k species
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main mollusc features
- muscular foot
- shell
- visceral mass
- radula
- mantle
- Ctenidium
- protostome cleavage
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mantle cavity
void in-between the body of a mollusk, and its mantle
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filament
rod-like structure to help maintain strength and rigitidy
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veliger
planktonic larva of many kinds of sea snails and freshwater snails, marine and freshwater gastropod molluscs
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girdle
strong but flexible structure that holds shell plates together
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ventricle
tube that collects and expells blood from atrium
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torsion
rotation of visceral mass
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efferent vs afferent vessel
- efferent vessel (from gill to excratory system)
- afferent vessel (to gill from excratory system)
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bipectinate vs. monopectanate gill
- bipectate - "two winged comb" gill
- monopectanate - "one winged combe" gill
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hemocyannin vs hemolymph vs. Hemoglobin
- henmocyannin - blue blood, copper based hemolymph
- hemolymph - clear fluid that surrounds organs and circ. system
- hemoglobin - red blood, iron based hemolymph
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palps
filtering large flap like folds
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exhalant/inhalant siphon
- water entering and exit sites
- inhalent - brings water into mantle cavity
- - more sensory tentacles
- exhalent- water and waste exits mantle cavity
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ligament
Horny elastic stucture or structures, joining the two valves of the shell
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ctenidium
- site of gas exchange cavity
- (gills)
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radula
scrapping organ used to obtain food
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pericardium
sac that contains the heart
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Auricle/atrium
blood receiver of the heart
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cephaliziation
head/face formation (eyes, mouth development feat)
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planospiral
having the shell coiled in one plane
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pallial line
The mark on the inside of a bivalve shell left at the position of the attachment of the mantle lobes
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adductor muscles
Muscle connecting the two valves of the shell
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esthes
light sensing organs that are derived from the mantle of the organism
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tetra-neury
having 4 nerve cords
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siphon/funnel
openings in bivalves
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branchial heart
accessory pumps in cephelapods
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mantle
Fleshy or membranous outgrowth of the body wall which secretes the shell
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central axis
an imaginary axis along the length of a shell
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odontophore
the tongue of flesh underlying the radular membrane
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pallial groove
groove-shaped mantle cavity, where the gills are located
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assymetrical helical coiling
coiling of the mantel and shell in a assymetrical coil not completely overlapping each other
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lemellibranch
sheep gill - maximizes surface area and minimizes size (smile with teeth look)
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Open circulatory system
pump blood into a hemocoel with the blood diffusing back to the circulatory system between cells. Blood is pumped by a heart into the body cavities, where tissues are surrounded by the blood.
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crystaline style
aids in digestion and mucus clean up
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Molluscan cross
radial alignment of cells during development
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systemic heart
main pump heart
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camera eye
a lens projecting an image onto a retina (no blind spot)
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visceral mass
- internal mass covered by mantle
- secretes shell
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Mulluscan classes
- aplacophora "no plate bearer"
- monoplacophora "one plate bearer"
- polyplacophora "many plate bearer"
- gastropoda "stomach foot"
- bivalvia "2 shell" / pelecypoda " hatchet foot"
- scaphopoda "spade foot"
- cephalopoda "head foot"
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Polyplacophora
- chitons
- dorsal ventrical compressed body
- shell divided to 8 plates
- marine organisms
- no developed head
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Gastropoda
- "stomach foot"
- snails and slugs
- marine, freshwater, terrestrial
- D-V elongation of the body
- coiling of the body and shell
- tortion
- oblique shift of the body and shell
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Gastropoda types
- prosobranch "gill in front" - torsion and shelled
- opsthobranch "gill in rear" - gill loss detorsion, lost of shell
- pulmonate "lung" - terrestrial, lost gills
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Aplacophora
- "no plate bearer"
- Neomania
- no shell
- oldest mollusc
- burrowing, crawling
- marine based
- fleshy body
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Monoplacophora
- "one-plate bearer"
- Neopelina
- one shell
- reflects general ancestor
- large satome
- deep sea animal
- large shell
- foot
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Bivalvia/pelecypoda
- "two-shell / hatchet foot"
- mussels and clams
- Lateral compression of body and foot
- dorsally hinged shell
- decephalization
- lost radula
- crystaline style
- marine and freshwater
- burrowing or anchored
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Scaphopoda
- "spade foot"
- Dentallium
- small group
- deposit feeders
- no ctenidium-perculum-circ.system
- burrowing org.
- one way current function
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Cephalopoda
- "head foot"
- squid, octopi
- carnivores
- shell reduction
- high metabolic rate
- ink gland
- cognitive thinking
- strictly marine, swimming
- beaks
- concurrent gas exchange
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