The Annelids

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Flashcards about Annelids

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16 Terms

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Annelids

Segmented worms

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Polychaeta

Marine worms

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Oligochaeta

Earthworms

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Hirudinea

Leeches

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Annelida Synapomorphies

Epidermal, paired setae

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Polychaeta Synapomorphies

Parapodia

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Clitellata Synapomorphies

Clitellum

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Metamerism

Segmental arrangement of body parts.

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Tagmatization

Specialization of specific body regions

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Class Polychaeta

Largest annelid class, mostly marine, cephalization in most, parapodia, well developed setae.

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Parapodia

Fleshy projection from the body wall

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Setae

Chitinous bristles that increase traction

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Class Clitellata

Earthworms, leeches, clitellum, no parapodia, few or no setae.

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Subclass Oligochaeta

Earthworms, primarily terrestrial or freshwater, few setae, no distinct head, no parapodia, primarily scavengers.

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Subclass Hirudinea

Leeches, freshwater, marine, terrestrial, body 34 segments, setae reduced or absent, dorso ventrally flattened.

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Palolo Worm

Samoan delicacy worm