Echinoderms- Asteroidea Flashcards Preview

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Flashcards in Echinoderms- Asteroidea Deck (32):
0

Class Asteroidea contains

Sea stars

1

Where is the mouth located in sea stars?

Central disk of the oral or ventral side

2

Aboral surface

The top or dorsal surface if an organism

3

Ambulacral groove

Grooves located on the oral surface and they hold tubes feet

4

Tubed feet are also called

Podia

5

Podia are guarded by what

Movable spines around the margins of the grooves

6

Tubed feet are used

For locomotion

7

Light sensitive eyespots which are small tentacles that contain pigments sensitive to light are locate where

At the tip of each arm

8

Sub-dermal spines and specialized pinchers are called

Pedicellariae

9

What is the function of Prdicellariae?

Capture small animals and carry them to the mouth

10

The outer layer of sea stars are covered by the

Epidermis

11

The epidermis is covered by

A cuticle

12

The epidermis has what

Neurosensory cells connected to mucus glands

13

What happens when detritus falls on the body

It is coated with mucus and the ciliates cells sweep the particles away

14

In sea stars how are ossicles joined together

By muscle fibers and connective tissues making it very flexible

15

Sea stars feed on

Snails, bivalves, crustaceans, polychates, coral and are all carnivorous

16

Sea stars digest how?

They every their stomachs out their mouths and externally digest

17

Sea stars have how many stomachs

2

18

The lower stomach is the

Cardiac stomach

19

The upper stomach is the

Pyloric stomach

20

Extra cellular digestion occurs where

Digestive ceca

21

Water enters the hydrovascular system where

The sieve plate (madreporite)

22

From the sieve plate water travels to the stone canal and from the stone canal water travels to the

Ring canal and out the arms through the radial canals

23

Ballon like structure on the internal side

Ampulla

24

Podia is

A hollow muscular tube and some species contain a sucker

25

Gas exchange occurs through

Diffusion through gills, through tubed feet, by water circulation

26

Excretion occurs through

Water flow or through membranes of the tubed feet

27

Their nervous system consists of

A nerve ring which contains branches of nerve that run down each arm

28

For regeneration how much of the nerve ring must be present

1/5

29

Sea stars are able to regenerate completely in about

A year

30

There is usually how many breeding seasons a year

1

31

One female can release how many eggs at once

2.5 million