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
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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