Nematodes are triploblastic

meaning that they

have three layers : the

ectoderm, the endoderm, and

the mesoderm.

Germ layers

Nematodes

are

bilaterally

symmetrical

Symmetry

Nematodes are pseudocoelomates, which means that the body cavities are lined with endodermis tissue and mesodermis tissues.

Coelom

Nemotodes have a complete digestive tract which means that they have two openings: a

mouth and a anus

Digestive tract

Nemotodes have a well developed nervous system which consists of 4 nerve ganglia and 6 longitudinal nerves that branch off of it which extend towards the mouth.

A.K.A ganglial nervous system

Cephalization

Nematodes are different than many other different types of worms due to their lack of segmentation.

Segmentation

Nematodes lack a skeletal system but instead have a tough outer layer called the cuticle. It maybe strong, but it is also flexible and sheds a few times while maturing into an adult.

Because of the lack of skeleton, nematods do not have any paired appendages.

Skeleton & appendages

Nematodes do not have a working circulatory system, but instead are able to circulate fluid, located in the pseudocoelom, by their body movements

Circulatory system

Nematodes also lack a functioning respiratory system, they instead rely on diffusion for the continuous supply of new oxidized air.

Respiratory system

Nematodes reproduce sexually, and have a six stage life process.

Males can be distinguished from the females because they are slightly smaller and have a hooked tail.

Reproduction

Their are two main types of nematodes. Parasitic nematodes can be found in and on almost any type of plant or animal.

They thrive mainly in soil, but can withstand almost any climate due to cryptobiosis. Cryptobiosis is the ability to suspend their lives

until they find their way into more favorable conditions.

Habitat