BIO153!16!15 Invertebrates

8/17/2019 BIO153!16!15 Invertebrates

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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


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15: INVERTEBRATE DIVERSITY How can we interpret the evolution of the coelom?

How have invertebrates adapted to their environment?


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Public Domain, https: //commons.wikim edia.org/w/ind ex.php?curid=1779536

blue-blood b/c they never wentoutside and they were so whitetheir veins showed


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THE TRULY BLUE-BLOODED horse shoe crabs - bacteriaand ecoli tests


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CNIDARIANS ARE DIPLOBLASTIC AND RADIALLY SYMMETRIC

sessile and mobile for parts of their lives


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AND THEY HAVE AN AMAZING WEAPON

Public Domain, https:/ /en.wikipedia.o rg/w/index.php?c urid=3907134

-many new bodyplans evolved duringthe Cambrianexplosion-Cnidarians havebeen radially

symmetric anddiploblastic since560million years


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LOPHOTROCHOZOANS INCLUDE A WIDE RANGE OF BODY PLANS

Polyplacophora


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THEIR NAME COMES FROM A FEEDING STRUCTURE AND A LARVAL FORM


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AND THEY GOT A FEW TRICKS

squid flying with jet propulsion, swim5 times as fast than they would underwater

-one way of avoiding predators

-we actually have no idea why thishappens, what use it is for


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spiral follows Fibanachi sequence-producing these membranes a it grows, moves out-each of those membranes have pores, nautalus uses this for flamboyancyregulation, allows it to move it up and down (just like scuba divers do!)


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ECDYSOZOANS INCLUDE THE MOST SPECIES

Ecdysis = moulting = shedding a touch external coat (cuticle)


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HOW DID THE ARTHROPOD BODY PLAN ARISE?

velvet worms


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Vollrath, F. 1992. Sci. Am.

THERE ARE A VARIETY OF WEB FORMS

AND FUNCTIONS


15/20

SPIDER SILK IS A COMPOSITE MATERIAL

Vollrath, F. 1992. Sci. Am.


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A SPIDER CAN PRODUCE DIFFERENT TYPES OF SILK


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SPIDER WEBS ARE STORM-PROOF


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THE GARDEN SPIDER’S WEB IS A MECHANISM

bubble of liquid on theinside and on the insideyou have a cable drum


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HYBRID SILK OFFERS LOTS OF PROMISES


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NEXT LECTURE PERIOD

Tutorial 7

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BIO153!16!15 Invertebrates