Term
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Definition
Repeated body segments of ectoderm and mesoderm
Evolved from unsegmented ancestors |
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Term
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Definition
| Shared derived character trait |
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Term
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Definition
Annelida
Arthropoda
Chordata |
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Term
True segments
Symmetry
Tissue layers
Development |
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Definition
Metameric
Bilateral
Triploblastic
Protostome |
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Term
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Definition
Paired
Formed by schizocoely and trocophore larvae |
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Term
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Definition
Prostomium
Peristomium
Not metameric |
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Term
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Definition
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Term
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Definition
In mesoderm
Forms dorsal and ventral mesenteries |
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Term
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Definition
| Circular and longitudinal muscles |
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Term
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Definition
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Term
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Definition
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Term
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Definition
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Term
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Definition
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Term
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Definition
Peristaltic
Alternating muscular contractions
Fluid filled coelom compartments
Seta anchors |
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Term
TRADITIONAL Annelid Classification
(4) |
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Definition
Polychaeta (paraphyletic)
Oligochaeta (paraphyletic)
Hirudinida (leeches)
Phyla Echiura and Sipuncula (not segmented) |
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Term
MODERN Annelid Classification
(4) |
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Definition
Polychaeta (Class Errantia and Sedentaria(Order Echiura)) dioecious
Order Clitellata (Oligochaeta and Hirudinidea) monoecious
Phylum Sipuncula (outgroup) |
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Term
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Definition
Mostly marine, abundant
Sub-Class Sedentaria (tube-living)
Sub-Class Errantia (free-moving, burrowing, or crawling) |
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Term
Genus Eunice aphroditois
(4) |
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Definition
Genus name
"Barry" the Bobbit worm
4 ft long predatory polychaete
2009 Blue Reef Aquarium, Cornwall UK |
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Term
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Definition
Tentacular crowns to feed
Moves food from radioles to mouth by ciliary action
Sabella (suspension feeder) |
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Term
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Definition
Synchronized emergence's
Gamete filled epitokes that at dawn, release eggs and sperm
Lack permanent sex organs
Gametes shed into coelom, gonoducts, nephridia/rupturing of body |
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Term
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Definition
Order name
"Spoon worm"
Littoral zone in warm oceans
Not segmented
Spoon shaped proboscis |
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Term
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Definition
Trocophore
Lands on female proboscus
Parasitizes
Impregnates female |
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Term
Order Echiuridae no sex
(2) |
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Definition
Trocophore
Doesn't land on female proboscus |
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Term
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Definition
Monophyletic
Clitellum (mucus cocoon and reproduction) |
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Term
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Definition
Terrestrial, freshwater
Fewer setae than polychaeta
Hermaphroditic, cross fertilization |
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Term
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Definition
Internal segmentation reduced
Hermaphroditic
Clitellum during breeding season only |
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Term
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Definition
Outgroup
"Peanut worm"
Nonsegmented
Benthic marine water
Lack setae and no vascular blood system
Large coelom, u shaped gut
Trocophore larvae
Introvert head with crown of branched tentacles |
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