Term
| Annelida (segmented worms) |
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Definition
Representative Groups: polychaetes, oliochaetes, leeches
Distingishing Features: segmentation
General habitat: mostly benthic
Significance in the Marine Environment: predators, deposit feeders, passive suspension feders
Level of Organization: organ system
Symmetry:bilateral
Segmentation:yes
Body Cavity:celom
Digestive Tract:complete or absent
Respiratory Exchange:gills or body surface
Cirulatory System:closed
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Term
| Chaetognatha (arrow worms) |
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Definition
Representative Groups: arrow worms
Distingishing Features: transparent body with fins
General habitat: mostly pelagic
Significance in the Marine Environment: mostly pelagic
Level of Organization: organ system
Symmetry: bilateral
Segmentation:no
Body Cavity: coelom
Digestive Tract: complete
Respiratory Exchange: body surface
Cirulatory System:none
Representative Groups: turbellarians, flukes, tapeworms
Distingishing Features: flattened body
General habitat: mostly benthic, many parasitic
Significance in the Marine Environment: pretators, many parasitic
Level of Organization:organ system
Symmetry:bilateral
Segmentation: no
Body Cavity:none
Digestive Tract:incomplete or absent
Respiratory Exchange:body surface
Cirulatory System:none |
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Term
| Hmichordata (hemichordates) |
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Definition
Representative Groups:acorn worms
Distingishing Features: dorsal, hllow nerce cord, gill slits
General habitat: mostly benthic
Significance in the Marine Environment: deposit feeders
Level of Organization: organ system
Symmetry: bilateral
Segmentation:reduced
Body Cavity: coelom
Digestive Tract: complete
Respiratory Exchange: body urface
Cirulatory System:part closed, part open |
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Term
| Brachiopoda (lamp shells) |
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Definition
Representative Groups:lamp shells
Distingishing Features: lophophore, clam-like shells
General habitat: benthic
Significance in the Marine Environment: bethic
Level of Organization: organ system
Symmetry:bilateral
Segmentation:no
Body Cavity: coelom
Digestive Tract: complete
Respiratory Exchange: body surface
Cirulatory System: open |
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Term
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Definition
Representative Groups:peanut worms
Distingishing Features: long, retractable anterior end
General habitat: benthic
Significance in the Marine Environment: predators
Level of Organization: organ system
Symmetry:bilateral
Segmentation:no
Body Cavity: coelom
Digestive Tract: complete
Respiratory Exchange:body surface
Cirulatory System:none |
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Term
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Definition
Representative Groups: bryozoans
Distingishing Features: lophphre, colonial
General habitat:benthic
Significance in the Marine Environment: filter feeders
Level of Organization: organ system
Symmetry:bilateral
Segmentation:no
Body Cavity: coelom
Digestive Tract: complete
Respiratory Exchange: body surface
Cirulatory System:none |
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Term
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Definition
Representative Groups:echiurans
Distingishing Features: non-retractable probosics
General habitat:benthic
Significance in the Marine Environment: predators
Level of Organization: organ system
Symmetry:bilateral
Segmentation:no
Body Cavity: coelom
Digestive Tract: complete
Respiratory Exchange:body surface
Cirulatory System:closed |
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Term
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Definition
Representative Groups: snails, clams, oyters, octopuses, chitons
Distingishing Features: foot, mantle, radula (absent in some groups)
General habitat: bethic, pelagic
Significance in the Marine Environment: pedators, grazes, filter feeders, some parasitic
Level of Organization: organ system
Symmetry:bilateral
Segmentation:no
Body Cavity: coelom
Digestive Tract: complete
Respiratory Exchange: gills
Cirulatory System:open or closed |
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Term
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Definition
Representative Groups: sponges
Distingishing Features: collar cells (choanocytes)
General habitat: Benthic
Significance in the Marine Environment: filter feeders
Level of Organization:cellular
Symmetry:asymmetrical
Segmentation:no
Body Cavity:none
Digestive Tract:none
Respiratory Exchange: Body surface
Cirulatory System:none |
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Term
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Definition
Representative Groups: Jellyfishs, sea anemones, corals
Distingishing Features:nematocysts
General habitat: Benthic, pelagic
Significance in the Marine Environment: predators, passce suspension feeders; corals are important reef builders
Level of Organization: tissue
Symmetry: radial
Segmentation:no
Body Cavity:none
Digestive Tract: incomplete
Respiratory Exchange: body surface
Cirulatory System: None |
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Term
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Definition
Representative Groups:ribbon worms
Distingishing Features:long proboscis
General habitat:many benthic
Significance in the Marine Environment: predators
Level of Organization: organ system
Symmetry:bilateral
Segmentation:no
Body Cavity:probscis cavity
Digestive Tract:complete
Respiratory Exchange:body surface
Cirulatory System: closed |
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Term
| Ctenophora (comb jellies) |
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Definition
Representative Groups: comb jellies
Distingishing Features: ciliary combs, colloblasts
General habitat: mostly pelagic
Significance in the Marine Environment: predators
Level of Organization:tissue
Symmetry:radical
Segmentation:no
Body Cavity:none
Digestive Tract:incomplete
Respiratory Exchange:body surface
Cirulatory System:none |
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Term
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Definition
Representative Groups:phoronids
Distingishing Features:lophophore, worm-like body
General habitat: benthic
Significance in the Marine Environment:filter feeders
Level of Organization: organ system
Symmetry:bilateral
Segmentation:no
Body Cavity: coelom
Digestive Tract: complete
Respiratory Exchange:body surface
Cirulatory System:closed |
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Term
| Echinodermata (echinoderms) |
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Definition
Representative Groups: seastars, brittle strs, sea urchins, sea cucumbers
Distingishing Features: tube feet, 5-way radilsymetry, wate vascular system
General habitat: mostly benthic
Significance in the Marine Environment:predators, depsit feeders, passive suspension feeders
Level of Organization: organ system
Symmetry:radial (adults), bilateral (no)
Segmentation:no
Body Cavity: coelom
Digestive Tract: complete
Respiratory Exchange: body surface
Cirulatory System:no |
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Term
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Definition
Representative Groups: nematodes.roundworms
Distingishing Features: bdy round in cross section
General habitat:mostly benthic, many parasitic
Significance in the Marine Environment:many parasitic, deposit feeders
Level of Organization: organ system
Symmetry:bilateral
Segmentation:no
Body Cavity:pseudocoelom
Digestive Tract:complete
Respiratory Exchange:body surface
Cirulatory System:none |
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Term
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Definition
Representative Groups: tunicates, vertebrates (fishes, reptiles, birds, mammals)
Distingishing Features: dorsal, hollow nerve cod, gill slits, norochord
General habitat: benthic, pelagic
Significance in the Marine Environment:
Level of Organization: organ system
Symmetry: bilateral
Segmentation: reduced
Body Cavity: coelom
Digestive Tract: complete
Respiratory Exchange: gills, lungs
Cirulatory System:closed |
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Term
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Definition
Representative Groups: crustaceans (crabs, shrimps),insects
Distingishing Features: exoskeetons, jointed legs
General habitat: benthic, pelagic, some parasitic
Significance in the Marine Environment: predators, grazers, filter feeders, some parasitic
Level of Organization: organ system
Symmetry:bilateral
Segmentation:yes
Body Cavity: coelom
Digestive Tract: complete
Respiratory Exchange: gills (in many crustaceans)
Cirulatory System:open |
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