-
Characteristics
of Nematodes
- •Ubiquitous
- •Unsegmented
- •Hydrostatic skeleton
- •Cuticle which is molted
- •Specialized sensory organs
- •Primarily dioecious
- •Complete digestive tract
- •No respiratory/circulatory systems
- •Most parasitic
- •Sensory organs, including a simple
- brain
-
Human
Roundworm Parasites
- •Hookworm
- •Pinworm
- •*Intestinal Roundworm (Ascaris sp.)
- •Trichinella (causes trichinosis)
- •Whipworm
-
-
Characteristics
of Echinoderms
- •All marine
- •Sea stars, sea urchins, sea
- cucumbers
- •Calcareous skeleton
- •Spines
- •Water-vascular system
- •Appear radially symmetrical,
- however are descended
frombilateral ancestors, have bilateral- larvae
- •Most dioecious
-
The
Water-Vascular System
- •echinodermata Specialized, unique coelomic cavity
- •Fluid-filled, hydraulic canals
- –Locomotion
- –Respiration/excretion
- •Sieve plate – opening for water balance
- •Tube feet (podia) usually with
- suckers
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