Invertebrates 2

Question 1

Flatworms

Answer 1

organ level
Cephalization
Bilateral Symmetry
Ladder-Type nervous system

Question 2

Turbellarians

Answer 2

free-living flatworms

Question 3

planaria

Answer 3

freshwater
Head is bluntly arrow shaped
 Auricles = sense organs
 Two light-sensitive eye spots 
 Three kinds of muscle layers:
 Outer circular layer 
 Inner longitudinal layer
 Diagonal layer

Excretory organ functions in osmotic regulation and water excretion
Asexual/Hermaphroditic

Question 4

parasitic flatworms types

Answer 4

flukes/trematodes

tapeworms/cestodes

Question 5

trematodes

Answer 5

Reproductive system well developed
Usually hermaphroditic
Complex life cycle

Question 6

cestodes

Answer 6

ant. region w/ modifications for attachment to intestinal host

body has long series of proglottids

self fertilize

complex life cycle

Question 7

each segment of cestode contains

Answer 7

full set of male and female sex organs

Question 8

Rotifers

Answer 8

named for crown of cilia resembling a rotating wheel (Corona)
  locomotion and digestion
mastax=pharynx
trophi=jaws
freshwater
pseudocoleomate

Question 9

nematodes

Answer 9

ubiquitous, abundant, habitat specific, host specific

Question 10

“If all the matter of the universe except the nematodes were swept away, out world would still be dimly recognizable, and if, as disembodied spirits, we could investigate it, we should find its mountains, hills, vales, rivers, lakes and oceans represented by a thin film of nematodes.”

Answer 10

N.A. Cobb. basically, they are super abundant

Question 11

Roundworms

Answer 11

Non-segmanted, generally colorless worms

larger ones are pseudocoleomate

parasitic roundworms infect humans, animals, plants
molt cuticle
eutely
only longitudinal muscles