lab quiz 4 Flashcards
gills have
many thin folded layers, cilia on surface, and two blood vessels going in opposite directions
mollusk basic parts
shell, mantle, mantle cavity, ventral foot, dorsal ventral mass, radula
shell
Composed of calcium carbonate; provides
protection for these soft bodied animals
mantle
thin layer of tissue covers the visceral mass on both
sides, lies between the visceral mass and the shell; it secretes the shell
mantle cavity
Space between visceral mass and mantle, in many molluscs the gills are suspended here
ventral foot
Muscular; used for locomotion in generalized mollusc
dorsal ventral mass
Location of digestive, reproductive, excretory organs—makes sense that these soft organs would be located dorsally under the shell for protection, mollusca means “soft bodied
radula
A toothed tongue; it scrapes food, like algae, off surfaces and/or shreds food into smaller pieces
hemoceol
main body cavity in mollusc and arthropods
coelom in mollusc
reduced to cavity just around the heart.
closed circulatory system
cephalopod circulatory system
open circulatory system
non cephalopod molluscs circulatory system and arthropod circulatory system
kidney
excretory system of molluscs
kidney steps
- unselective filtration of coelomic fluid 2. selective reabsorption 3. excretion
ammonia and uric acid
aquatic and terrestrial nitrogenous waste in molluscs
Polyplacophora
chitons
gastropoda
slugs and snails
bivalvia
clams, mussels, scallops, oysters
cephalopoda
squid, octopus, cuttlefish, nautilus
mollusc and arthropod digestive tract
complete digestive tract
bivalve feeding strategy
active suspension feeding
bivalve nervous system
less centralized and less cephalized
siphons
where water enters and exits the mantle cavity
movement of blood in cephalopods
veins with deoxygenated blood –> gill heart –> oxygenated gills –>systemic heart –> arteries with oxygenated blood
chromataphore
for cephalopod camouflage or communication
buccal bulb
houses the radula and beak in squids
squid nervous system
large brain, with sensory structures like eyes and tentacles to see and catch prey
torsion
occurs only in gastropods, and rotates the visceral mass and mantle and results so the mantle cavity is over the head and mouth so the gut and nervous system are twisted
pneumostome
opening on the right side of the mantle of a terrestrial slug
parts of gastropod protected by shell
it varies but probably mantle cavity and visceral mass
gastropod gas exchange
terrestrial no shell : pneumostome, aquatic : gills, terrestrial with shell: lungs
gastropod sensory structures
light sensing tentacles, and chemical sensing tentacles.
gastropod with no shell
slugs
gastropod with shell
snails
chitin habitat
intertidal zone
grazer
chitin feeding strategy
location of gills in chitins
contained within the mantle cavity of chitins
tugmata
functional groups formed by fused segments
exoskeleton
formed by cuticle in arthropods
cuticle
has a waxy layer on outside then the inner layer is hard and made of chitin
exoskeleton requirements
- hard enough for protection 2. light enough for mobility 3. versatile thickness and flexibility.
exoskeleton functions
shape and support, attachment for muscles for locomotion, protection, prevention of water loss, integral part of sensory receptors.
arthropod nervous system
ventral nerve cord with segmental ganglia
4 respiratory organs in arthropods
gills, booked gills, lungs, and trachea
spiricle
the external opening of the trachea
Chelicerata
horseshoe crab, spiders, scorpions, mite
crustatea
crayfish, crab, shrimp, barnacle
Myriapoda
centipedes and millipedes
hexapoda
grasshopper, cockroach, water bug, mealworm beetle, termite, walking stick
what causes size constraint in arthropods
molting and exoskeleton weight and strength
cheliped
in arthropods, one of the pair of appendages that have claws
carapace
hard shell covering back in crustations
chelicerea
first appendage: venomous fang of spider
pedipalps
second appendage: on spider used to hold onto prey
crustacea clade
includes crustacea and hexapods
complete metamorphosis advantage
animal ends up not having to share food source like they would in incomplete metamorphosis
