nematodes

Question 1

what are some features of phylum nematoda

Answer 1

1-2mm
highly abundant
lil worm fellas
cuticle molted at intervals
has a through gut
post anal tail
high hydrostatic pressure
moves via muscle contraction against pressure
muscular oesophageal region
oesophageal bulb to push down food
males have cloaca, females have anus
tails used to anchor in sediment

Question 2

what are some sexual dimorphic differences in nematodes

Answer 2

males have cloaca, and precloacal spine

Question 3

what information can be gained from buccal cavity

Answer 3

mode of life
reduced circumference of buccal cavity can be selective deposit feeders
wider buccal cavity no teeth are non selective deposit feeders
small fixed tooth can be epigrowth feeders
elaborate structures can be omnivores and predators

Question 4

what functions do the amphids serve

Answer 4

thought to be chemosensory

Question 5

how do nematodes move

Answer 5

serpentine

Question 6

what are some differences in cuticle of nematodes

Answer 6

can be homo or hetrogenous
can be smooth or have ornamentation
may be laterally differentiated

Question 7

what are the sensory organs of nematodes

Answer 7

papillae
setae - mechanosensory function
amphid - chemosensory - shape taxinomically important
cephalic setae have regular 6 + 6 + 4 arrangement

Question 8

what are some features of nematode reproduction

Answer 8

sexual, egg laying
male has cloaca and spicules
4 juvenile stages