The Roundworms. Triploblastic Pseudocoelomate Three tissue layers False Body Cavity No Mesentery...
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Transcript of The Roundworms. Triploblastic Pseudocoelomate Three tissue layers False Body Cavity No Mesentery...
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NEMATODAThe Roundworms
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BASIC CHARACTERISTICS Triploblastic
PseudocoelomateThree tissue
layersFalse Body Cavity
No Mesentery (thin connective tissue) to support the organs)
Fluid filled and acts as a hydrostatic skeleton, provides for circulation, aids in digestion
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BASIC CHARACTERISTICS (CONTINUED) Complete
Digestive System (mouth to anus)
Most are microscopic
Bilateral Symmetry
Unsegmented Most dioecious
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INTEGUMENTARY SYSTEM Epidermis is covered by an
external cuticle that is often molted for growth
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EXCRETORY SYSTEM Glandular in
aquatic species
Tubular in parasitic species
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NERVOUS SYSTEM Cerebral
ganglion-around the pharynx
Two longitudinal nerve cords
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FEEDING AND DIGESTION Free living roundworms can be
carnivorous or herbivorous, usually soil dwellers feeding on small or microscopic organisms
Parasitic roundworms feed off of their host tissues and fluids
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CIRCULATION AND RESPIRATION No circulatory system
Pseudocoel fluid serves to circulate some nutrients and wastes
No respiratory systemGas exchange across skin-diffusion
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REPRODUCTIVE SYSTEM Dioecious Often dimorphic
Males and females are different sizes
Method of reproduction varies by species
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PARASITIC NEMATODES Ascaris
lumbricoidesGiant intestinal
roundworm Enterobious
vermicularisHuman pinworm
Necator americanusNew world
hookworm
Trichinella spiralisPorkworm
Wuchereria sp.Filarial worms
(elephantiasis)
Dirofilaria immitisDog heartworm
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OTHER PSEUDOCOELOMATES (ASCHELMINTHS) Rotifers-usually
water dwellers
Gordian (horsehair) worms-live in running or standing water