Ls 1 Lecture May 15 Platyhelminthes And Lophophorates

Front 1

which phylum includes flatworms?

Back 1

platyhelminthes

Front 2

which phylum includes ribbonworms?

Back 2

nemertea

Front 3

which phylum includes roundworms?

Back 3

nematoda

Front 4

platyhelminthes are _________ symmetrical

Back 4

bilaterally

Front 5

true or false: platyhelminthes have eye spots

Back 5

true

Front 6

how many germ layers do platyhelminthes have?

Back 6

three, triploblastic

Front 7

platyhelminthes: acoelomate, coelomate, pseudocoelomate?

Back 7

acoelomate

Front 8

true or false: platyhelminthes have an anus

Back 8

false, incomplete gut (mouth, no anus)

Front 9

platyhelminthes: slow or fast food processing

Back 9

slow due to incomplete gut, can only do one thing at a time

Front 10

why are platyhelminthes small?

Back 10

they have no respiratory or circulatory organs

Front 11

protonephridia

Back 11

excretory organ (like a kidney) that regulates water balance

platyhelminthes are the first ones to have anything like this

Front 12

cnidarians have nerve nets, what do platyhelminthes have instead?

Back 12

a little itty-bitty brain and nerve cords

Front 13

the cilia and mesoderm in platyhelminthes allow for

Back 13

greater freedom of movement (mesoderm --> muscles)

Front 14

cephalization

Back 14

evolution of definite head and brain area

Front 15

cephalization requires ______ symmetry

Back 15

bilateral

Front 16

parendyma

Back 16

type of mesoderm, more loosely packed cells

Front 17

platyhelminthes: flattened _____________ dorsoventrally or laterally

Back 17

dorsoventrally

Front 18

why are flatworms flat?

Back 18

increase SA/V ratio, which helps in diffusive transport of gases and wastes

Front 19

what are the three classes of platyhelminthes?

Back 19

class turbellaria: only free-living (non-parasite) group
class cestoidea: parasitic tapeworms
class trematoda: parasitic flukes

Front 20

how does class turbellaria feed?

Back 20

carnivores and scavengers
they have a pharnyx coming out of their body with a mouth at the end to vacuum up food to eat

Front 21

how does class turbellaria reproduce?

Back 21

regeneration

cross-fertilizing hermaphrodites (maintain male & female parts until sex)

Front 22

hypodermic impregnation

Back 22

parmales actively place spermatophores on the body surface of females, in turbellaria's case, both are hermaphrodites

Front 23

parasitic tapeworms: phylum and class?

Back 23

phylum platyhelminthes
class cestoda

Front 24

tegument

Back 24

natural covering of a body

Front 25

true or false: class cestoda tapeworms have a ciliated tegument

Back 25

false, it is nonciliated

Front 26

proglottid

Back 26

One of the segments of a tapeworm, containing both male and female reproductive organs

Front 27

strobilation

Back 27

Asexual reproduction by division into body segments
Transverse fission

Front 28

how does class trematoda's complex lifestyle increase regeneration?

Back 28

primary host can eat the infected 2nd host

Front 29

what are the three lophophorate phyla?

Back 29

phylum ectoprocta (=bryozoa)
phylum brachiopoda
phylum phoronida

Front 30

how many species does phylum ectoprocta contain?

Back 30

4500 species

Front 31

how many species does phylum brachiopoda have?

Back 31

about 335 species

Front 32

how many species does phylum phoronida have?

Back 32

20 species

Front 33

When were there about 30,000 species of phylum brachiopoda?

Back 33

400 mya in the Paleozoic and Mesozoic

Front 34

Moss animals are in phylum...

Back 34

ectoprocta

Front 35

lampshells are in phylum...

Back 35

brachiopoda

Front 36

horseshoe worms are in phylum

Back 36

phoronida

Front 37

True or false: phylum brachiopoda has 2 shells dorsoventrally flattened

Back 37

true