Echinoderms

Question 1

To which class do sea urchins belong? Range?

Answer 1

Echinoidea (Ord-Rec)

Question 2

To which class do sea cucumbers belong? Range?

Answer 2

Holothuroidea (Ord-Rec)

Question 3

Top surface of sea urchin?

Answer 3

aboral or adapical

Question 4

Bottom surface of sea urchin?

Answer 4

adoral

Question 5

Main body of sea urchin?

Answer 5

test

Question 6

Central part on aboral surface?

Answer 6

apical disc

Question 7

Aboral hole that surround anus?

Answer 7

periproct

Question 8

Surrounds mouth on adoral surface?

Answer 8

peristome

Question 9

The 5 narrower segments radiating from the apical disc?

Answer 9

ambulacra (connect to ocular plates)

Question 10

The 5 broader segments radiating from the apical disc?

Answer 10

interambulacra (connect to genital plates)

Question 11

The edge of the test viewed from above?

Answer 11

ambitus

Question 12

The exit from the water vascular system?

Answer 12

madreporite

Question 13

Socket that articulates with a tubercle?

Answer 13

spine base

Question 14

Inflatable sac at base of tube-foot?

Answer 14

ampulla

Question 15

5 strong jaws, each with a single tooth?

Answer 15

Aristotle’s lantern

Question 16

Sand dollars belong to this order?

Answer 16

Order Clypeasteroida

Question 17

Heart urchins belong to this order?

Answer 17

Order Spatangoida

Question 18

Globular sea urchins belong to this order?

Answer 18

Order Camarodonta

Question 19

Sea stars belong to this Subphylum?

Answer 19

Asterozoa, Class Stelleroidea

Question 20

Brittle/basket stars belong to this subclass?

Answer 20

Ophiuroidea

Question 21

Short-lived subclass of sea stars?

Answer 21

Somasteroidea

Question 22

Where do the pore pairs occur, and how many per plate?

Answer 22

Ambulacra plates, 3 pairs

Question 23

Between ambulacra plates

Answer 23

Per radial suture

Question 24

Looks like star fish wrapped around a rock.

2 examples

Answer 24

Edrioasteroidea
Stromatocystites
Isorophus

Question 25

Asteroidea of Asteroza

Example

Answer 25

Sea Stars

STENASTER

Question 26

Ophiuroidea

Answer 26

Brittle stars etc

Unchanged since Ordovician

Question 27

Crinoid body

Answer 27

Theca

Question 28

Crinoid branches made of

Answer 28

Pinnules

Question 29

Earliest true crinoid

Answer 29

Cupulocrinus, Ord

Question 30

Example is camerate crinoid

Answer 30

Scyphocrinites