The Deuterostomia Flashcards

1
Q

What are the main phyla within the deuterostomes?

A

Echinoderms

Hemichordates

Chordates

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2
Q

What are the commonalities of the Deutersotomes?

A
  • second hole in embryo forms mouth

- radial cleavage

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3
Q

What are the taxa within the Echinoderms?

A
  • Asteroids (starfish)
  • Ophiuroids (brittle stars)
  • Echinoids (sea urchins)
  • Holothurians (sea cucumbers)
  • Crinoids (sea lilies)
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4
Q

What is the basic anatomy of echinoderms?

A
  • pentaradial symmetry
    (imperfect due to medrapolite)
  • Oral end on bottom
    aboral end on top
  • water vascular system
  • endoskeleton (made of calcium carbonate ossicles)
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5
Q

How do Ophiuroids differ from asteroids?

A
  • movable arms
  • dirtirus feeders
  • no anus
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6
Q

How do Echnoids differ from asteroids?

A
  • spieks
  • Pedicellariea (small pincers)
  • inside dominated by aristotles lantern
    (ossicular and muscular feeding structure)
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7
Q

How do Holothurians differ from asteroids?

A
  • Defensive Cuvier tubes
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8
Q

What are the two defining classes of Hemichordates?

A
  • Euteropneusts

- Pterobrachs

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9
Q

What is the general structure of Chordates

A
  • Pharyngeal slits
  • Dorsal hollow nerve cord
  • Notochord
  • Endostyle
  • postanal tail
  • lateral muscles
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10
Q

What is a notochord?

A

Stiffened rod that runs underneath the nerve cord

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11
Q

How are chordates seperated?

A

Vertebrates

Invertebrates

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12
Q

What are the two main taxa of invertebrate chordates?

A

Tunicates

Ceohalochodates

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