Term
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Definition
| growth through constant skeletal extension |
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Term
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Definition
| growth through molting (shedding skeleton) |
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Term
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Definition
| "Tuft-bearer" Ciliated tentacles functioning in filter (i.e., suspension) feeding |
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Term
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Definition
| Larva with a ring of cilia around its middle |
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Term
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Definition
| Bilaterrally symmetric, triploblastic, pseudocoelomic protostomes. Dependent on Corona for movement and feeding. |
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Term
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Definition
| "flatworms" Bilaterrally symmetric, triploblastic, acoelomic protostomes. |
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Term
| 3 classes of Platyhelminthes |
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Definition
Turbellarians: free-living, blind gut
Cestodes: tapeworms (endo-parasitic), direct absorption (no mouth)
Trematodes: flukes (endo-parasitic), ex: Schistosoma, blind gut. |
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Term
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Definition
| "Segmented Worms" - Bilaterally symmetric, triploblastic, coelomic, protostomes. |
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Term
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Definition
(“many bristles”) Feed by deposit feeding, suspension feeding, or predation
Move by hydrostatic skeleton & chaetae (or setae) on parapodia
Reproduction is sexual or asexual |
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Term
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Definition
(“few bristles”) Deposit feeders
Move via hydrostatic skeleton
Reproduction is sexual with internal fertilization (hermaphroditic) |
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Term
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Definition
(leeches) Parasites, predators, and/or scavengers
Named for hirudin – an anticoagulant protein
Move by undulating using hydrostatic skeleton
Reproduce by internal fertilization (hermaphroditic) |
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Term
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Definition
| Bilaterally symmetric, triploblastic, coelomic protostomes. |
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Term
| 3 body part components of Mollusks |
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Definition
Muscular foot – movement (reduced coelom)
Visceral mass – internal organs and gills
Mantle – often secretes CaCO3 shell |
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Term
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Definition
(clams, mussels, scallops, oysters) 2 hinged shells made of CaCO3. Most extensive fossil record for any macroscopic lineage.
Suspension feeders-
Gills function in feeding and respiration,
Current produced by siphon,
Only mollusk group to lack a radula.
Movement-
Clams burrow with their muscular foot,
Scallops swim,
Mobile trochophore larvae.
Sexual reproduction (external fertilization). |
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Term
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Definition
(snails, slugs, nudibranchs) “Belly-foot”: Named for muscular foot on ventral side
Except for snails, lack a shell
Feed via radula (Rasp covered with chitin “teeth”)
Undulating contractions = move by gliding
Sexual reproduction with internal fertilization |
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Term
| 4 major classes of mollusks |
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Definition
Bivalves (clams, mussels)
Gastropods (snails, slugs)
Polyplacophorids (chitons)
Cephalopods (squid, octopus) |
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Term
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Definition
(chitons) “Many-plate-bearing”: all chitons have 8 dorsal CaCO3 plates.
Feed by using radula to scrape algae.
Move by gliding on muscular foot.
Sexual reproduction with external fertilization. |
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Term
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Definition
(squid, nautilus, octopus) “Head foot”: well developed head & foot modified into tentacles,
Shells are reduced or absent (except nautilus),
Very large brains and image forming eyes.
Predators-
Hunt by sight,
Use radula and beak to bite,
Squid and octopus inject poison.
Swim via undulation or jet propulsion.
Sexual reproduction with internal fertilization. |
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Term
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Definition
Lophotrochozoa-
Rotifers
Platyhelminthes
Annelids
Mollusks
Ecdysozoa-
Nematodes
Arthropods |
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Term
| 4 features of protostomes |
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Definition
| Mouth first development. triploblastic. bilaterally symmetric. Acoelomic, Pseudocoelomic, or Coelomic. |
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Term
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Definition
| all share one common ancestor that had that trait |
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Term
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Definition
| no single common ancestor has that trait (Rotifers & Nematodes pseudocoelom, Annelids & Arthropods & Chordatas segmentation, Platyhelminthes aceolom. |
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