Download - Nematodes
Phylum Nematodes
By: Stephanie Pierce &Ryan Martinez
Examples
Round Worm
Roundworm Magnified
StructureThe fluid of the psuedocoel and the
pressure of the cuticule work together as a hydrostatic skeleton. Nematodes
are also uniform in sturcture which makes them extremely hard to
classify.
They are:
Body Symmetry•Cylindrical•Unsegmented•Bilaterally Symmetrical•Pseduocoelomate•With 4 openings
•Mouth•Anus•Vulva•Excretory Pore
LocomotionNematodes move through contractions of the typically
longitudinally oriented muscles.
Circulation
Nematodes don't have a circulatory system, fluids are dispersed into the
pesudocoelom.
RespirationNematodes have no respritory system for the uptake or distribution of oxygen.
They use repirations by diffusion.
ReproductionNematodes reproduce similarly to humans,
except males excreites his sperm through the anus.
And some nematodes have both male and female parts.
During mating the male inserts spiculas is inserted into the vagina of the female thus
forming a passageway for the sperm to travel.
FeedingThe feeding habits of Nematodes is very diverse depending on the type.
There are millions of different variations of Nematoda. In one handfull of soil there are thousands of variations.
Bacteria, Algee, Fungi, Plants, some Nematodes are even parasitic.
Nematoda Inhabitance
Represents 90% of all life on the sea floor
DigestionNematodes have whats like a tube at
both ends of there body. food is digested in the gut but is not
distributed by any special vascular system.
Excretion
Nutrients and wastes are distuibuted in the body cavity. Where the contents are regulated by an excritory canal along the
side of the body
2 Main Casses •Adenophorea
•Phasmides absent
•Secernentea•Phasmides present posterior to the anus
*Other variations are present including glands, sensory organs, ect.
~Phasmide: Unicellular sensilla in the lateral tail region.
The End.