Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
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 -Reaggregation |
|
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.
|