EEMB 3: Animals - Echinoderms Flashcards

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1
Q

T/F: Echinoderms are also found on land

A

false, marine only

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2
Q

What type of skeleton do echinoderms have

A

a calcified internal skeleton

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3
Q

What type of vascular system do echinoderms have?

A

Water vascular system

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4
Q

Describe the water vascular system

A

fluid filled canals

control the tube feet

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5
Q

What symmetry do echinoderms have?

A

biradial

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6
Q

What symmetry do echinoderm larvae have?

A

bilateral

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7
Q

echinoderms have a poorly developed ____ and very basic body plans. The water vascular system is pretty much the main thing running.

A

nervous system

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8
Q

Where does the calcium carbonate shell come from?

A

specialized shells that originate from the embryonic mesoderm

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9
Q

What links the WVS to the seawater

A

sieve plate

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10
Q

___ canal connects to the ring canal and _____ radiate from the ring canal

A

stone

radial

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11
Q

____ are connected to all tube feet

A

bulbs

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12
Q

____ protrude between the sieve plates and are retracted by _____ muscles

A

tube feet

longitudinal

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13
Q

Two subphyla of the echinoderms

A

Pelmatozoa -crinoids

Eleutherozoa - the rest

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14
Q

What are the crinoids? What is their type of locomotion?

A

sea lillies and feather stars

sessile organisms

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15
Q

Describe the feeding in crinoids

A

tube feet used for filtering and then conveyor-belt the food to the mouth using cilia

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16
Q

echinozoans include

A

sea urchins, sand dollars, cucumbers

17
Q

Asterozoans include

A

sea and brittle stars

18
Q

echinozoans are ____ and the key feeding structure is the ____

A

grazers

aristotles lantern

19
Q

Sea cucumbers are what class?

A

Holothuroidea (worm shaped, no cephalization_

20
Q

Key function of sea cucumbers (class holothuroidea) and their organs

A

evisceration of everything

21
Q

Describe the feeding of sea stars

A

stick tube feet into the muscle to pull it apart
eviscerates stomach and digests externally
absorbs everything back in