Nematoda- round worms

Superphylum

ecdysozoa

What kind of exoskeleton do they have?

cuticle exoskeleton

Characteristic of cuticle exoskeleton

tough and flexible

In order for nematodes to grow, what must they do?

molt

What is their cuticle exoskeleton made out of?

collagen and chitin

Body plan?

bilateral

triploblastic or diploblastic?

triploblastic

acoelomate, pseudocoelomate or eucoelomate?

pseudocoelomate

Type of morphology?

cylindrical tubular

Protostome or deuterostome?

protostome

Types of round worms?

free-living or parasitic

Their simple cephalization consists of?

sensory papillae and bristles that provide sense of touch

What kind of digestive system?

complete digestive system

What does their mouths contain?

lips and teeth

digestion process?

mouth, pharynx, intestines

solid food waste exits where??

via anus

Do they have a circulatory/ respiratory?

no

since no circ, how do they process nutrients?

gases and nutrients diffuse throughout body

How does their excretory system work?

ammonia (their metabolic waste) is removed via diffusion

nervous system structure

simple “brain” from which 4 longitudinal nerve cords emerge

travel down length of body

what kind of nerves?

1 dorsal

2 lateral (on each side)

1 ventral

Which nerve cord is more developed?

ventral nerve cord

How does reproduction work for nematodes?

reproduction is species specific

Reproduction for dioecious species?

internal fertilization

Internal fertilization process

female lays eggs that develop for 2 wks and larvae undergo ecdysis