BIO153!16!14 Animal Diversity

8/17/2019 BIO153!16!14 Animal Diversity

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THIS WEEK IN BIO153

! Tuesday: Lecture 14: Animal diversity

! Thursday: Lecture 15:

Invertebrate diversity

! Friday: Tutorial 7

! Readings: Chapters 32

& 33

! Lab 7: Invertebrates II

Session ID:l|c



14: ANIMAL DIVERSITY Animal diversity is based on a few body plans

There are still discussions about the phylogeny of some animal taxaWhat do such discussions mean for science?



http://wallpapers.free-review.net/15_~_Box_Jellyfish_underwater_Images.htm

toxin that can literallydissolve ...



https://www.worldwildlife.org/species/directory?

direction=desc&sort=extinction_status



F i s c h e t t i , M

. 2 0 1 6

. S c i , A m .

M a r c h : 7 6

very species weknow!!!!

light gray lines are only a few specieshave been identified and the darkerlines show that more species havebeen described



ANIMALS ARE …

multicellular, heterotrophic eukaryotes with tissues that develop from embryoniclayers



ALL ANIMALS CAN BE CHARACTERIZED BY A BODY PLAN

! Body symmetry

! Tissue layers

! Body cavities

! Embryonal development



WE CAN DISTINGUISH ANIMALS BY THEIR BODY CAVITIES

a coelom is a body cavity completely lined with mesoderm(lined with germ layers but to be specific it's the mesoderm)



WE DISTINGUISH ANIMALS

BY THEIR DEVELOPMENT



IT TOOK A FEW MILLION YEARS



WE CAN USE MORPHOLOGICAL INFORMATION TO CONSTRUCT A

PHYLOGENETIC TREE FOR ANIMALS

sister group to bilateria is ctenophora



WE ALSO HAVE MOLECULAR INFORMATION TO CONSTRUCT A

PHYLOGENETIC TREE FOR ANIMALS

Morphological data Molecular data

Acoela assumed to be

part of theplatyhelminthes b/cthey don't have aceolom



WE CAN AGREE ON THESE STATEMENTS (P. 711)

! All animals share a common ancestor

! Sponges are basal animals

! Eumetazoa is a clade of animals with true tissues

! Most animal phyla belong to the clade Bilateria

! Chordates and some other phyla belong to the clade

Deuterostomata

(are not the sister group)



BUT WHAT ABOUT ASSIGNMENT 2?

T e l f o r d , M

. J .

, L

. L

. M o r o z , a n d K

. M

. H a l a n y c h . 2

0 1 6

. A s i s t e r l y d i s p u t e . N a t u r e ( L o n d o n ) 5 2 9 : 2 8 6

– 2 8 7

.



HOW SHOULD WE INTERPRET THIS?

! What does this say about science?

! What would we need to conclude the debate?

! What about our textbook?



NEXT LECTURE PERIOD

Lecture 15: Invertebrate diversity

BIO153!16!14 Animal Diversity

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