lecture 13

Question 1

What are Ecdysozoa

Answer 1

moulting animals

Question 2

moult

Answer 2

shed entire cuticle atleast once in life cycle

Question 3

cuticle

Answer 3

non living covering of epidermis

Question 4

what phylums are contained in Ecdysozoa

Answer 4

nematoda
namatomorpha
priapula

Question 5

what animals are considered nematoda

Answer 5

nematodes
roundworms
threadworms

Question 6

how many species of nematodes

Answer 6

27000 named species

Question 7

where do nematodes reside

Answer 7

freshwater, marine, terrestrial

Question 8

what type of digestive system do nematodes have

Answer 8

complete digestive system

Question 9

what type of respiratory or gas exchange systems do nematodes have

Answer 9

no circulatory or gas exchange systems

Question 10

what muscles do namatodes have

Answer 10

body wall muscles, exclusively longitudinal

Question 11

are nematodes diverse>

Answer 11

no, they have veru little morphological diversity

Question 12

do nematodes have coelom?

Answer 12

pseudocoelomates

Question 13

do nematodes have brain

Answer 13

no, but they have circumesophogeal connectives

Question 14

do nematodes have nerves?

Answer 14

they have 2 nerve chords
dorsal and ventral

Question 15

how are signals sent in muscle cells

Answer 15

muscle cells send projections to the locomotory nerves

Question 16

what sexes are nematoda

Answer 16

can have seperate sexes, or be hermaphroditic, or have a combonation of the two

Question 17

how is sperm transfered in nematoda

Answer 17

copulation

Question 18

what type of development do nematoda have

Answer 18

direct development

Question 19

what type of cleavage do nematodes have

Answer 19

determinate cleavage and eutely

Question 20

caenorhabditis elegens what are they known for

Answer 20

model nematode where every cell is known

Question 21

what do free living nematodes feed on?

Answer 21

small organic particles

Question 22

what is different about free living nematodes? why?

Answer 22

they have a strong pharynx
for sucking in liquides containing suspended particles

Question 23

what do nematodes eat

Answer 23

-free living mfs feed on organic particles
-some are predators
-and many are parasitic to plants and animals, and HUMAN

Question 24

what do entomopathogenic nematodes have

Answer 24

symbiotic bacteria

Question 25

entomopathogenic nematode life cycle

Answer 25

once host penetrated, nematode release symbiotic bacteria. bacteria kill host with toxins, and the nematodes feed on host.

Question 26

what is phylum nematomorpha

Answer 26

the horsehair worms

Question 27

how many species in phylum nematomorpha

Answer 27

365 named species

Question 28

what are some characteristics of phylum nematomorpha

Answer 28

the adults are extremely long
the cuticle is very thick

Question 29

do nematomorpha have muscles

Answer 29

they lack circular muscles, like nematoda

Question 30

does nematomorpha have coelom

Answer 30

they have filler material, no obvious pseudocoelum

Question 31

does nematomorpha have a gut

Answer 31

gut highly reduced or absent in adults because they dont feed

Question 32

nematomorpha larva
whatdo they look like and do

Answer 32

larva has spiny eversible head.
they paracitize terrestrial insect and induce the host to move to water

Question 33

what is phylum priapula

Answer 33

penis worms

Question 34

how many named species of priapula

Answer 34

22

Question 35

where do priapula live

Answer 35

they burrow in marine sediment

Question 36

what is the introvert of the priapula

Answer 36

it is a spiny eversible head used for burrowing

Question 37

do priapula have coelum

Answer 37

yes, they have pseudoceolum

Question 38

what type of development priapula

Answer 38

deuterostome style

Question 39

what do priapula eat

Answer 39

they are predatory, they evert toothed pharynx

Question 40

trace fossils priapula

Answer 40

high diversity during cambrian period