122 Invertebrates_ Molluscs.txt

• mollis = soft
• 100k species

• muscular foot
• shell
• visceral mass
• radula
• mantle
• Ctenidium
• protostome cleavage

void in-between the body of a mollusk, and its mantle

rod-like structure to help maintain strength and rigitidy

planktonic larva of many kinds of sea snails and freshwater snails, marine and freshwater gastropod molluscs

strong but flexible structure that holds shell plates together

tube that collects and expells blood from atrium

rotation of visceral mass

• efferent vessel (from gill to excratory system)
• afferent vessel (to gill from excratory system)

• bipectate - "two winged comb" gill
• monopectanate - "one winged combe" gill

• henmocyannin - blue blood, copper based hemolymph
• hemolymph - clear fluid that surrounds organs and circ. system
• hemoglobin -  red blood, iron based hemolymph

filtering large flap like folds

• water entering and exit sites
• inhalent -  brings water into mantle cavity
•             - more sensory tentacles
• exhalent- water and waste exits mantle cavity

Horny elastic stucture or structures, joining the two valves of the shell

• site of gas exchange cavity
• (gills)

scrapping organ used to obtain food

sac that contains the heart

blood receiver of the heart

head/face formation (eyes, mouth development feat)

having the shell coiled in one plane

The mark on the inside of a bivalve shell left at the position of the attachment of the mantle lobes

Muscle connecting the two valves of the shell

 light sensing organs that are derived from the mantle of the organism

having 4 nerve cords

openings in bivalves

 accessory pumps in cephelapods

Fleshy or membranous outgrowth of the body wall which secretes the shell

an imaginary axis along the length of a shell

the tongue of flesh underlying the radular membrane

groove-shaped mantle cavity, where the gills are located

coiling of the mantel and shell in a assymetrical coil not completely overlapping each other

sheep gill -  maximizes surface area and minimizes size (smile with teeth look)

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.

aids in digestion and mucus clean up

radial alignment of cells during development

main pump heart

a lens projecting an image onto a retina (no blind spot)

locomotion

protective shield

• internal mass covered by mantle
• secretes shell

• 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"

• chitons
• dorsal ventrical compressed body
• shell divided to 8 plates
• marine organisms
• no developed head

• "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

• prosobranch "gill in front" - torsion and shelled
• opsthobranch "gill in rear" - gill loss detorsion, lost of shell
• pulmonate "lung" - terrestrial, lost gills

• "no plate bearer"
• Neomania
• no shell
• oldest mollusc
• burrowing, crawling
• marine based
• fleshy body

• "one-plate bearer"
• Neopelina
• one shell
• reflects general ancestor
• large satome
• deep sea animal
• large shell
• foot

• "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

• "spade foot"
• Dentallium
• small group
• deposit feeders
• no ctenidium-perculum-circ.system
• burrowing org.
• one way current function

• "head foot"
• squid, octopi
• carnivores
• shell reduction
• high metabolic rate
• ink gland
• cognitive thinking
• strictly marine, swimming
• beaks
• concurrent gas exchange