Activity 19:Activity 19:Phylum NematodaPhylum Nematoda

Pre-lab DiscussionPre-lab Discussion

NEMATODESNEMATODES

Unsegmented roundwormsUnsegmented roundworms

Most successful among wormsMost successful among worms

HABITATSHABITATS

Live in all kinds of habitatsLive in all kinds of habitats SeawaterSeawater Fresh waterFresh water terrestrialterrestrial

MODES OF LIVINGMODES OF LIVINGFREE LIVINGFREE LIVING ( (Turbatrix aceti -Turbatrix aceti - vinegar vinegar eel) - these free-living roundworms exist eel) - these free-living roundworms exist by feeding on bacteria and fungi found in by feeding on bacteria and fungi found in the sediments of nonpasteurized vinegar the sediments of nonpasteurized vinegar

PARASTITICPARASTITIC

FREE LIVINGFREE LIVING ( (Turbatrix aceti -Turbatrix aceti - vinegar vinegar eel) - these free-living roundworms exist eel) - these free-living roundworms exist by feeding on bacteria and fungi found in by feeding on bacteria and fungi found in the sediments of nonpasteurized vinegar the sediments of nonpasteurized vinegar

PARASTITICPARASTITICVinegar eels in vinegarVinegar eels in vinegar

MODE OF NUTRITIONMODE OF NUTRITIONMODE OF NUTRITIONMODE OF NUTRITION

some can subsist in organic detritussome can subsist in organic detritus

others are scavengersothers are scavengers

some can subsist in organic detritussome can subsist in organic detritus

others are scavengersothers are scavengers

BASIC BODY PLANBASIC BODY PLANBASIC BODY PLANBASIC BODY PLANBody is covered by Body is covered by nonliving cuticlenonliving cuticle

Lack cilia or flagellaLack cilia or flagella

(+) (+) pseucocoelompseucocoelom – – lacks peritoneal lininglacks peritoneal lining

(+) COMPLETE (+) COMPLETE digestive tractdigestive tract

Mostly Mostly dioeciousdioecious

Males usually smaller Males usually smaller than femalesthan females

Body is covered by Body is covered by nonliving cuticlenonliving cuticle

Lack cilia or flagellaLack cilia or flagella

(+) (+) pseucocoelompseucocoelom – – lacks peritoneal lininglacks peritoneal lining

(+) COMPLETE (+) COMPLETE digestive tractdigestive tract

Mostly Mostly dioeciousdioecious

Males usually smaller Males usually smaller than femalesthan females

PARASITIC SPECIES THAT ARE PARASITIC SPECIES THAT ARE IMPORTANT TO MANIMPORTANT TO MAN

PARASITIC SPECIES THAT ARE PARASITIC SPECIES THAT ARE IMPORTANT TO MANIMPORTANT TO MAN

AscarisAscarisAscarisAscaris

PARASITIC SPECIES THAT ARE PARASITIC SPECIES THAT ARE IMPORTANT TO MANIMPORTANT TO MAN

PARASITIC SPECIES THAT ARE PARASITIC SPECIES THAT ARE IMPORTANT TO MANIMPORTANT TO MAN

HookwormsHookwormsHookwormsHookworms

bursa

mouth

Cutting plates

PARASITIC SPECIES THAT ARE PARASITIC SPECIES THAT ARE IMPORTANT TO MANIMPORTANT TO MAN

PARASITIC SPECIES THAT ARE PARASITIC SPECIES THAT ARE IMPORTANT TO MANIMPORTANT TO MAN

PinwormsPinwormsPinwormsPinworms

Head with cephalic alae

A. vermicularis in sigmoid colon

PARASITIC SPECIES THAT ARE PARASITIC SPECIES THAT ARE IMPORTANT TO MANIMPORTANT TO MAN

PARASITIC SPECIES THAT ARE PARASITIC SPECIES THAT ARE IMPORTANT TO MANIMPORTANT TO MAN

Trichina wormsTrichina wormsTrichina wormsTrichina worms

Trichinella spiralisEncysted larva

Trichuris trichiuria

CLASSIFICATIONCLASSIFICATIONCLASSIFICATIONCLASSIFICATION

Class Aphasmida Class Aphasmida – – without without PHASMIDSPHASMIDS Trichuris Trichuris (whipworm)(whipworm) Trichinella Trichinella (trichina worm)(trichina worm)

Class PhasmidaClass Phasmida – – with with PHASMIDSPHASMIDS and and AMPHIDSAMPHIDS Ascaris Ascaris (intestinal roundworm)(intestinal roundworm) Enterobius (pinworm/seatworm)Enterobius (pinworm/seatworm) AncylostomeAncylostome (hookworm) (hookworm)

Class Aphasmida Class Aphasmida – – without without PHASMIDSPHASMIDS Trichuris Trichuris (whipworm)(whipworm) Trichinella Trichinella (trichina worm)(trichina worm)

Class PhasmidaClass Phasmida – – with with PHASMIDSPHASMIDS and and AMPHIDSAMPHIDS Ascaris Ascaris (intestinal roundworm)(intestinal roundworm) Enterobius (pinworm/seatworm)Enterobius (pinworm/seatworm) AncylostomeAncylostome (hookworm) (hookworm)

STUDY THE FOLLOWING STUDY THE FOLLOWING SPECIMEN:SPECIMEN:

STUDY THE FOLLOWING STUDY THE FOLLOWING SPECIMEN:SPECIMEN:

Preserved Preserved AscarisAscaris

AncylostomaAncylostoma

EnterobiusEnterobius

TrichiurisTrichiuris

Trichinella Trichinella

Preserved Preserved AscarisAscaris

AncylostomaAncylostoma

EnterobiusEnterobius

TrichiurisTrichiuris

Trichinella Trichinella