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Annelida. By: MICHELLE LAUTERBACH NATALIE CARDONA SAM MILLER. Germ Layers. Three Endoderm Mesoderm Ectoderm They are all triploblasts (3 primary germ layers). Symmetry. Bilaterally Symmetrical. Coelom. Yes, annelids have a coelom.
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Annelida By: MICHELLE LAUTERBACH NATALIE CARDONA SAM MILLER
Germ Layers • Three • Endoderm • Mesoderm • Ectoderm • They are all triploblasts (3 primary germ layers)
Symmetry Bilaterally Symmetrical
Coelom • Yes, annelids have a coelom. • Generally organized as a series of compartments divided by intersegmental septa • Locomotion can be maintained if the animal loses a segment
Digestive Tract Unsegmented gut that runs through the middle of the body from the mouth, located on the underside of the head, to the anus.
Cephalization Some annelids have a certain degree of cephalization.
Segmentation • Budding segmentation • Allows for flexibility and mobility • Can bend at segmented parts
Skeleton and Appendages • No skeleton • Compressed fluid makes for a water based skeleton (hydrostatic skeleton) • No limbs • But they do have muscles
Circulatory System Closed system of blood vessels – making pumping more efficient. Multiple hearts
Respiratory System • Occurs through diffusion. • No respiratory organ • Takes oxygen through skin • This is why it’s important it’s moist
Reproduction • Hermaphroditic • Reproduction occurs through exchange of sperm packets.
Habitat • Found in many terrestrial environments ranging from semiarid to moist, well vegetated areas • soil, leaves, under rocks and logs