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Flashcards in Invertebrates 2 Deck (11):
1

Flatworms

organ level
Cephalization
Bilateral Symmetry
Ladder-Type nervous system

2

Turbellarians

free-living flatworms

3

planaria

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

4

parasitic flatworms types

flukes/trematodes
tapeworms/cestodes

5

trematodes

Reproductive system well developed
Usually hermaphroditic
Complex life cycle

6

cestodes

ant. region w/ modifications for attachment to intestinal host

body has long series of proglottids

self fertilize

complex life cycle

7

each segment of cestode contains

full set of male and female sex organs

8

Rotifers

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

9

nematodes

ubiquitous, abundant, habitat specific, host specific

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.”

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

11

Roundworms

Non-segmanted, generally colorless worms

larger ones are pseudocoleomate

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