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15 Cards in this Set

  • Front
  • Back
Describe acoelomates
-No body cavity except digestrive tract
-Region between gut(endoderm) and epidermis filled with mesenchyme and muscle.
-Simplest of triploblastic body form
What is the purpose of a coelom?
The coelom protects the reproductive organs and gut and it is used for storage. It is recruited as part of the hydrostatic skeleton and for movement.
Describe blastocoelomates
- Persistant blastocoel between gut and body wall
-Can store millions of eggs
Describe eucoelomates
-True coelom= mesodermal cavity
-Often used for movement and hydrostatic skeleton
Describe schizocoely
The formation of the coelom happens by splitting the mesoderm in half
Describe enterocoely
The formation of coelom happens by out pocketing of the gut.
What is a Reynolds Number and how does it affect invertebrates?
Quantifies the ratio of inertial force to viscous force. Life at low Reynolds numbers is very different from what we experience. Viscous force much stronger and more important.
What are some examples of locomotion and support?
-Ameboid locomotion:some larvae, amoebid cells in body
-Cillia & flagella: larval stage of everything but arthropods, comb jellies
-Hydrostatic skeleton: earthworms
-Rigid skeleton:
-Endoskeleton: sponges, invert chordates, starfish
-Exoskeleton: arthropods
Name some feeding strategies
-Suspension feeding: trapping particles suspended in fluid

-Deposit feeding: feeding on settled food particulate underneath the sediment
Name 3 types of life cycles in invertebrates
-Indirect development: different stages involving metamorphosis
-Direct Development: no metamorphosis and each stage looks like the others
Mixed development- young held inside and released after hatching
Describe the parasitic life cycles
Ectoparasite- living and feeding on outside
Endoparasite- feeding on inside
Mesoparasite- living in body cavity
What are the 2 theories of the origin of metazoa?
Syncytial theory and colonial theory
Describe the phylum porifera
-pore bearing
-Parazoan (lack true embryological germ layers)
- True tissues absent; multicellular but cells totipotent
-Sessile, suspension feeders with unique water canals
-Assymetrical or +/- radially symmetrical
-Unique water-collar cells: choanocytes
What are the type of spicules found in sponges?
-Calcium carbonate: Class Calcarea
-Silceous & 6-rayed: Class Hexactinellida(Marine only)
-If siliceous, not 6-rayed; or made of collagen(spongin): Class desmospongiae
What is unique about glass sponges?
The first light transducers. They allow light to travel down their spicules to bring light to otherwise dark cavities. This provides energy to photosynthetic symbionts.