Lab Exam 4

Question 1

main characteristics of phylum Echinodermata

Answer 1

-pentaradial symmetry
-dermal endoskeleton
-water vascular system
-all marine
-pincherlike pedicellariae
-dermal branchia
-lack a definitive head
-lack segmentation
-primitive nerve system with reduced sense organs

Question 2

what kind of symmetry do echinoderms have

Answer 2

pentaradial symmetry

Question 3

what kind of skeleton do echinoderms have

Answer 3

dermal endoskeleton

Question 4

what kind of vascular system do echinoderms have

Answer 4

water vascular system

Question 5

characteristics of echinoderm nerve system

Answer 5

reduced sense organs

Question 6

are echinoderms deuterostomes or protostomes

Answer 6

deuterostomes

Question 7

what characteristics do echinoderms, hemichordates, and chordates share

Answer 7

-deuterostomes
-enterocoelous coelom
-radial cleavage
-dermal endoskeleton
-bilateral symmetry (in larval stage)

Question 8

classes of echinoderms

Answer 8

Class Asteroidea, Class Ophiuroida, Class Echinoidea, Class Holothuroidea

Question 9

common name of class Asteroidea

Answer 9

sea stars

Question 10

where do sea stars commonly live

Answer 10

rocky coastlines

Question 11

what do sea stars feed on

Answer 11

snails, bivalves, crabs, corals, worms, and other echinoderms

Question 12

do sea stars have many predators

Answer 12

no

Question 13

symmetry of sea stars

Answer 13

pentaradial

Question 14

characteristics of sea star arm

Answer 14

contain ambulacral grooves with tube feet and pedicellariae

Question 15

characteristics of sea star tube feet

Answer 15

contain suction discs for gripping

Question 16

where are the anus and madreporite on a sea star

Answer 16

the aboral surface

Question 17

where is the sea star mouth

Answer 17

oral surface

Question 18

basic sea star reproductive characteristics

Answer 18

dioecious with a bilateral bipinnaria larva stage

Question 19

general sea star anatomy

Answer 19

central disc and 5 rays (arms)

Question 20

what is the sea star epidermis covered by

Answer 20

numerous spines protruding through the skin from the endoskeleton, and dermal branchia

Question 21

what are dermal branchia

Answer 21

skin gills

Question 22

pediellaria location and function on sea stars

Answer 22

-around the spines
-used to keep the arboreal surface clean

Question 23

sea star eyespot

Answer 23

located at the tip of each ray
-small, red

Question 24

what is the sea star mouth surrounded by

Answer 24

large moveable oral spines

Question 25

what is the madreporite used for in sea stars

Answer 25

to filter water into the water vascular system of echinoderms

Question 26

what are the dermal branchia used for in sea stars

Answer 26

to absorb oxygen from the water

Question 27

characteristics of coelomic cavity in sea stars

Answer 27

-inside the rays and central disc
-contains coelomic fluids which bathes the visceral organs

Question 28

where is the pyloric stomach in sea stars

Answer 28

in the central disc