Chapter 16 - Echinoderms - Test 3

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22 Terms

1

characteristics

  1. Pentaradiate symmetry

  2. water vascular system

  3. endoskeleton plates (ossicles)

  4. Dermal brachiae

  5. pedicellariae

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2

function of aboral madreporite

water intake and exit to control volume in water vascular system

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3

dermal branchaiae

cutaneous respiratory structures

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4

pedicellariae

structure that clear debris from the skins surface

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5

components of the endoskeleton and how does form follow function here

  1. ossicles connected by “catch collagen” which is mutable (solid to liquid)

  2. maintain posture with no additional effort

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6

what are function of the water-vascular system

  1. excretion

  2. respiration

  3. feeding

    1. locomotion’’

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7

sea stars eat?

carnivores; clams

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8

unusual about the stomach

evert part of stomach into prey

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9

reproduction

  1. dioceous

  2. external fertilization

  3. asexual

  4. cleavage of central disc

  5. regeneration

  6. autonomy (defense mechanism)

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10

able to regenerate lost parts

yes

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11

autonomy

losing body part as defensive mechanism

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12

how are arms of the brittle stars different than those of asteroids

all organs found in central disc

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13

unusual about some soft tested urchins?

brightly colored; not boney; deliver poisons

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14

Aristotles lantern?

part of sand dollar; has teeth and muscles

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15

primary diet of sea urchins

scrape off food; graziers

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16

characteristic distribution of tube feet in some species of sea cucumbers

sole (well-developed); locomotion

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17

how do sea cucumbers feede

tentacles come out, nutrients trapped; filter-feeding

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18

unusual defense mechanism of sea cucumber

self - evisceration = respiratory trees come out so predators ear that then reproduce them

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19

sea cucumbers involved in commensalism?

animals live inside cloaca (fish)

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20

how is their life history different than most echinoderms (feather stars)

sessile and stalked dyring metamorphisis; free-moving adults

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21

feeding method of feather stars

passive filter feeders

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22

how is the water vascular system different in feather stars

multiple madreporic pores instead of just one

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