Zoology Test 1d Flashcards Preview

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Flashcards in Zoology Test 1d Deck (12):
1

body plan of scyphozoa

- large
- horeshoe-shaped gonads
- oral arms
- no velum

2

cubozoa

chironex or box jellyfish

3

anthozoa

- coral reef (stony and soft)
- anemone

4

body plan of anthozoa

- unlike other classes, body is densely muscular polyp
- gastrovascular cavity divided by numerous septa
- nematocysts
- no medusa stage, not polymorphic
- motile stage, larvae

5

nematocysts

stinging threads

6

what are the two kinds of corals

- true or stony corals
- soft corals

7

stony corals

hexacorallians (6 tentacles)

8

soft coral

octacorallians (8 tentacles)

9

characteristics of stony coral

- polyp similar to miniature sea anemone
- secretes calcareous cup that, when in colonies, over the years develops into massive skeleton called coral rock
- gastrovascular cavities of different individuals connected

10

characteristics of soft coral

- most are colonial
- colonies of polyps connected via gastrovascular tubes
- octomerous symmetry with 8 tentacles
- skeleton of protein and spicules

11

generalizations about coral reefs

- among most productive of all ecosystems
- large formation sof calcium carbonate laid down by living organisms
- polyps and coralline algae are most responsible for precipitating calcium carbonate to form coral rock
- reef building corals require warmth, light and salinity of undiluted seawater
- zooxanthellae provide food via photosynthesis and enhance ability to secrete calcium carbonate

12

coral bleeching

ejection of zooxanthellae, when they leave, the coral reef dies