PHYLUM PHYLUM ANNELIDAANNELIDAPHYLUM PHYLUM ANNELIDAANNELIDA

AnnelidsAnnelidsAnnelidsAnnelids

Segmented wormsSegmented worms Made up of somites/segments/metameresMade up of somites/segments/metameres Bilaterally symmetricalBilaterally symmetrical TripoblasticTripoblastic Eucoelomates - have a true coelomEucoelomates - have a true coelom

Body cavity lined with peritoneumBody cavity lined with peritoneum Mouth is Mouth is anteroventralanteroventral Anus is Anus is posterodorsalposterodorsal NERVOUS SYSTEMNERVOUS SYSTEM with brain and with brain and

gangliaganglia May be monoecious or dioeciousMay be monoecious or dioecious

Segmented wormsSegmented worms Made up of somites/segments/metameresMade up of somites/segments/metameres Bilaterally symmetricalBilaterally symmetrical TripoblasticTripoblastic Eucoelomates - have a true coelomEucoelomates - have a true coelom

Body cavity lined with peritoneumBody cavity lined with peritoneum Mouth is Mouth is anteroventralanteroventral Anus is Anus is posterodorsalposterodorsal NERVOUS SYSTEMNERVOUS SYSTEM with brain and with brain and

gangliaganglia May be monoecious or dioeciousMay be monoecious or dioecious

Class PolychaetaClass Polychaeta

Mostly marineMostly marine Have most primitive membersHave most primitive members Segments have parapodia with setaeSegments have parapodia with setae Head has well developed eyes and Head has well developed eyes and

tentaclestentacles

Class OligochaetaClass Oligochaeta

Head not well developedHead not well developed Body without parapodia but with Body without parapodia but with

setaesetae Have a glandular citellum (special Have a glandular citellum (special

segment)segment)

Class HirudineaClass Hirudinea

LeechesLeeches Fixed number of segmentsFixed number of segments Segmentation incomplete; externally Segmentation incomplete; externally

divided by divided by annuliannuli Have anterior and posterior suckersHave anterior and posterior suckers HermaphroditicHermaphroditic Citellum at segments 9 and 10Citellum at segments 9 and 10 Genital pore in segment 11Genital pore in segment 11

Nereis ( clamworm)- Nereis ( clamworm)- Class PolychaetaClass Polychaeta

Nereis ( clamworm)- Nereis ( clamworm)- Class PolychaetaClass Polychaeta

NereisNereis (clamworm) (clamworm)NereisNereis (clamworm) (clamworm)Dorsum

VenterVenter

SabellaSabella (fan worm/ feather duster (fan worm/ feather duster worms) worms) Class PolychaetaClass Polychaeta

SabellaSabella (fan worm/ feather duster (fan worm/ feather duster worms) worms) Class PolychaetaClass Polychaeta

radioles

Aphrodita Aphrodita (sea mouse)- (sea mouse)- Class PolychaetaClass Polychaeta

Aphrodita Aphrodita (sea mouse)- (sea mouse)- Class PolychaetaClass Polychaeta

Pheretima (earthworm)Pheretima (earthworm)- - Class OligochaetaClass Oligochaeta

Pheretima (earthworm)Pheretima (earthworm)- - Class OligochaetaClass Oligochaeta

Life cycle of EarthwormLife cycle of EarthwormLife cycle of EarthwormLife cycle of Earthworm

LumbricusLumbricus (earthworm)- (earthworm)- Class OligochaetaClass Oligochaeta

LumbricusLumbricus (earthworm)- (earthworm)- Class OligochaetaClass Oligochaeta

Parts of Parts of LumbricusLumbricusParts of Parts of LumbricusLumbricus

Hirudo Hirudo (Leech)(Leech)- - Class HirudineaClass HirudineaHirudo Hirudo (Leech)(Leech)- - Class HirudineaClass Hirudinea

Anatomy of LeechAnatomy of LeechAnatomy of LeechAnatomy of Leech

MacrobdellaMacrobdella- - Class HirudineaClass HirudineaMacrobdellaMacrobdella- - Class HirudineaClass Hirudinea

KiitosKiitos KiitosKiitos