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Paleontology > Echinoderms > Flashcards

Echinoderms Flashcards

1
Q

To which class do sea urchins belong? Range?

A

Echinoidea (Ord-Rec)

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2
Q

To which class do sea cucumbers belong? Range?

A

Holothuroidea (Ord-Rec)

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3
Q

Top surface of sea urchin?

A

aboral or adapical

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4
Q

Bottom surface of sea urchin?

A

adoral

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5
Q

Main body of sea urchin?

A

test

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6
Q

Central part on aboral surface?

A

apical disc

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7
Q

Aboral hole that surround anus?

A

periproct

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8
Q

Surrounds mouth on adoral surface?

A

peristome

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9
Q

The 5 narrower segments radiating from the apical disc?

A

ambulacra (connect to ocular plates)

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10
Q

The 5 broader segments radiating from the apical disc?

A

interambulacra (connect to genital plates)

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11
Q

The edge of the test viewed from above?

A

ambitus

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12
Q

The exit from the water vascular system?

A

madreporite

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13
Q

Socket that articulates with a tubercle?

A

spine base

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14
Q

Inflatable sac at base of tube-foot?

A

ampulla

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15
Q

5 strong jaws, each with a single tooth?

A

Aristotle’s lantern

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16
Q

Sand dollars belong to this order?

A

Order Clypeasteroida

17
Q

Heart urchins belong to this order?

A

Order Spatangoida

18
Q

Globular sea urchins belong to this order?

A

Order Camarodonta

19
Q

Sea stars belong to this Subphylum?

A

Asterozoa, Class Stelleroidea

20
Q

Brittle/basket stars belong to this subclass?

A

Ophiuroidea

21
Q

Short-lived subclass of sea stars?

A

Somasteroidea

22
Q

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

A

Ambulacra plates, 3 pairs

23
Q

Between ambulacra plates

A

Per radial suture

24
Q

Looks like star fish wrapped around a rock.

2 examples

A

Edrioasteroidea
Stromatocystites
Isorophus

25
Q

Asteroidea of Asteroza

Example

A

Sea Stars

STENASTER

26
Q

Ophiuroidea

A

Brittle stars etc

Unchanged since Ordovician

27
Q

Crinoid body

A

Theca

28
Q

Crinoid branches made of

A

Pinnules

29
Q

Earliest true crinoid

A

Cupulocrinus, Ord

30
Q

Example is camerate crinoid

A

Scyphocrinites

Paleontology (2 decks)

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