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BIO II
chordates
32
Biology
Undergraduate 4
04/25/2010

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Term
Chordate characteristics
Definition
notocord
dorsal nerve cord
pharyngeal pouches
post-anal tail
Term
notocord
Definition
stiff but flexible rod that extends the length of the body and provides an attachment site for muscles
Term
chordate subphyla
Definition
urochordata
cephalochordata
myxini
vertebrata
Term
urochordata
Definition
tunicates, sea squirts, invertebrate, filter feeder, immobile adult, mobile larvae, larvae have chordate characteristics
Term
cephalochordata
Definition
lancelets, gill slitted pharynx, a simple brain/nerve cord, segmented muscles, filter feeders
Term
myxini
Definition
hagfish, jawless, cranium made of cartilage plates, no bones, nearly blind, sensory tentacles to find food, mucus producer
Term
vertebrata
Definition
verterbral column, skeleton = bone or cartilage, jaws, chamber for the brain, gills, modified heart
Term
oviparous
Definition
lay eggs
Term
ovoviparous
Definition
yolk sac
Term
viviparous
Definition
live birth
Term
endotherimc
Definition
warm blooded
Term
ectothermic
Definition
cold blooded
Term
torpor
Definition
DAILY slugishness where metabolic rate slows
Term
estivation
Definition
SEASONAL hibernation usually in summer
Term
2 chambered heart
Definition
fish, gill capillaries--> body
Term
3 chambered heart
Definition
amphibians, RA + LA empty into one ventricle where oxygenated + deoxygenated blood mix together --> body
Term
4 chambered
Definition
mammals, RA --> RV --> lungs --> LA --> LV --> body
Term
7 classes
Definition
petromyxontiformes
chondrichthyes
osteichthyes
amphibia
reptilia
aves
mammalia
Term
petromyzontiformes
Definition
lampreys, true vertebrates, freshwater and marine, jawless, some parasitic
Term
chondrichthyes
Definition
cartilagenous fish (sharks), cartilage skeleton, 5-7 gill slits, 2CH, leathery skin
Term
sharks
Definition
ampulla of Lorinzini detect E energy, Lateral line system - detect change in water pressure, very strong sense of smell, sophisticated immune system
Term
osteichthyes
Definition
bony fish, most diverse group, swim bladder, 2CH, operculum, all separate sexes (external fertilization)
Term
ray finned fishes
Definition
95% of all fishes
Term
lobe finned fishes
Definition
coelecanths, ancestors to amphibians
Term
amphibia
Definition
double life, metamorphosis, 3CH, lungs replaced gills in adults, skin = respiratory organ, external fertilization (int salamanders), bony skeleton c limbs
Term
salamanders
Definition
aquatic have external gills, summer estivation (frogs = winter), terrestrial develop lungs
Term
reptilia
Definition
snakes, lizards, turtles, alligators, crocodiles, internal fertilization, lay eggs (amniotoc eggs), 3CH, ectothermic, continued skeletal development, snakes = pelvic girdles, jacobson's organ = taste air, lungs more developed
Term
aves
Definition
birds, distinguished by feathers, adapted for flight, hollow bones, some bones absent, shelled egg, feathered wings, endothermic, high metabolic rate, efficient lungs, elastic air sacs, 4CH, advanced nervous system, flightless birds almost always on islands
Term
mammalia
Definition
animals with hair, females secrete milk from glands, skull = larger brain and teeth, care for their young, 3 groups montremes, marsupials and placental mammals
Term
montremes
Definition
lay amniotic eggs, young lick up milk secreted from sweat glands
Term
marsupials
Definition
kangaroos, koala bears, opossum, young are born immature, crawl to a pouch, attach to a nipple
Term
placental mammals
Definition
dominate/diverse group, placenta, long term dependancy, every continent but antarctica
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