Lect 8 (rotifera & nematoda)

Which physiological systems aren’t needed when organism is microscopic?

circulation, respiratory & excretory

what is this?

rotifera (“wheel-bearing”)

__ means to be born with a set of cell but instead of dividing for growth, they expand.

Eutely

__ state is a dormant state of extremely low metabolism. happens due to:

• environmental stress

• limited motility due to small size

cryptobiosis

what’s the synapomorphy for rotifera?

sticky toes & mastax (highly muscularized pharynx)

rotifera reproduces through __ where:

• females eggs are not fertilized but divide via mitosis

• some sexual reproduction as well

parthenogenesis

whats the synapomorphy for nematoda?

amphid (chemosensory organs on head)

what are those?

nematoda

where can you find nematodes?

everywhere (in vertebrates, plants, more)