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Natural Sciences 360 Legacy of Life Lecture 07 Dr. Stuart S. Sumida

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Natural Sciences 360 Legacy of Life Lecture 07 Dr. Stuart S. Sumida. ANIMALIA (More Similar to Fungi than Plants). ANIMAL SIMILARITIES PLANTS FUNGI Cell Walls - Immobile - Often need - substrate - Heterotrophs - Not photosynthetic.

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slide1

Natural Sciences 360

Legacy of Life

Lecture 07

Dr. Stuart S. Sumida

ANIMALIA

(More Similar to Fungi than Plants)

slide2

ANIMAL SIMILARITIES

PLANTS FUNGI

Cell Walls -

Immobile -

Often need -

substrate

- Heterotrophs

- Not photosynthetic

slide4

Eumetazoa has:

Germ Layers

Endoderm

Ectoderm

Tissues

slide5

Segmentation: an example:

A simplified arthropod larva with multiple segments, each with appendages, or the genetic ability to develop appendages.

slide6

Different kinds of arthropods can elaborate upon different segments and appendages. This provides an enormous versatility.

slide7

Choanoflagella

Porifora

Placozoa

Ctenophora

Cnidaria

Protostomia

Pterobranchia

Echinodermata

Hemichordata

Chordata

Animalia

(What of this do I need

to know?!?)

slide9

Choanoflagellates have no fossil record. It is likely that choanoflagellates existed on the Earth since the Late Precambrian, because they are the closest living relatives of the sponges, the most primitive metazoans.

Choanoflagellates are almost identical in shape and function with the choanocytes or “collar cells” of sponges; these cells generate a current that draws water and food particles through the body of a sponge, and they filter out food particles.

slide10

Animalia

Multicellular heterotrophs

slide11

Choanoflagella

Porifora

Metazoa

slide12

Porifera (Sponges):

Known as far back as PreCambrian

600 million years ago.

slide14

Choanoflagella

Porifora

Placozoa

slide15

Placozoa: Only one species:

Trichoplax adhaerens

slide16

Choanoflagella

Porifora

Placozoa

Ctenophora

Cnidaria

Eumetazoa

slide17

Eumetazoa

Germ Layers

Endoderm

Ectoderm

Tissues

slide18

Ctenophores and Cnidarians

Two germ layers

Only one opening into gut.

slide19

Ctenophores and Cnidarians

Known as far back as PreCambrian “Ediacarian Faunas”.

slide22

Cnidaria:

Jelly fish

slide24

Choanoflagella

Porifora

Placozoa

Ctenophora

Cnidaria

Protostomia

Bilateralia

slide25

Bilateralia

Bilaterally symmetrical at some point during ontogeny

(“Ontogeny” = lifecycle from conception to death)

slide26

Bilateralia

Includes two great groups of animals:

Protostomia (means 1st mouth)

Deuterostomia (means 2nd mouth)

slide27

Protostomia includes many phyla, including:

  • Arthropoda
  • Mollusca
  • Annelida (segmented worms)
  • Many others
slide28

Choanoflagella

Porifora

Placozoa

Ctenophora

Cnidaria

Protostomia

Pterobranchia

Deuterostomia

(We’ll do these later.)

slide29

PROTOSTOMIA

Bilateralia – Part 1

slide30

Choanoflagella

Porifora

Placozoa

Ctenophora

Cnidaria

Protostomia

Pterobranchia

Echinodermata

Hemichordata

Chordata

Animalia

slide31

Recall : Bilateralia –Includes two great groups of animals:

Protostomia (means 1st mouth)

Deuterostomia (means 2nd mouth)

slide32

Protostomia includes many phyla, including:

  • Arthropoda
  • Mollusca
  • Annelida (segmented worms)
  • Many others
slide33

Ecdysozoa

Others

Platyhelminthes

Mollusca

Annelida

Lophotrochozoa

slide34

Ecdysozoa

Others

Platyhelminthes

Mollusca

Annelida

Lophotrochozoa

slide35

Platyhelminthes – flatworms thought to be a primitive member of this grouping.

Lack a “coelom” – a fluid-

filled space between gut tube

and body wall.

slide36

Ecdysozoa

Others

Platyhelminthes

Mollusca

Annelida

Lophotrochozoa

slide37

Annelid Worms:

Annelid-like organisms are known from PreCambrian (over 600 million years old) Edicarian Faunas.

Key Innovation: Segmentation

slide39

MOLLUSCA

  • Most groups known back to Cambrian or PreCambrian
  • Includes:
  • Polyplacophora (chitons)
  • Bilvavia
  • Cephalopoda
  • Gastropoda
slide40

Features of MOLLUSCA

  • Four key synapomorphies:
  • Shell
  • Mantle (secretes shell)
  • Radula (feeding appraratus)
  • Muscular foot
slide41

POLYPLACOPHORA

Chitions – Molluscs with segmented shells

slide43

Gastropods:

All gastropods have some degree of TORSION (twisting).

slide44

Cephalopoda – includes:

  • Nautiloids
  • Ammonoids*
  • Cuttlefish
  • Squid
  • Octopi
  • *found by Mary Anning
slide47

Ecdysozoa

Others

Platyhelminthes

Mollusca

Annelida

Lophotrochozoa