Use the diagram below to label the anatomy of a sponge.
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1 Name Chapter 33 - Invertebrates - As yu read, fcus n the trends, the increasing cmplexity f the rganisms and the adaptatins t their envirnment. Use the infrmatin frm P. Prifera as a sample fr the - type f infrmatin yu are lking fr fr each f the - Paraza n real tissues fllwing animals. G t yur bk t find P. Prifera spnges characteristics fr each f the fllwing grups. Cmplete this BEFORE lecture! Sessile; n nerves r muscles Water flws in thru pres and int the spngcel (central cavity) then ut thru the sculum (large pening) Filter-feeder chancytes (cllar cells) trap fd particles and ingest by phagcytsis; they line the spngcel Hermaphrdites can crss fertilize with water currents Zygte swimming larva sessile adult Regeneratin Symmetry -- Use the diagram belw t label the anatmy f a spnge. - Eumetaza TRUE TISSUE Radiata radial symmetry; diplblastic P. Cnidaria Ex. pening 1
2 2 frms: Nervus system Cnidcytes Nematcysts 1. What is the difference between a plyp and a medusa? Label the diagram belw representing the life cycle f Obelia. P. Ctenphra cmb jellies Lcmtin Tentacles and cllblasts Bilateria bilateral symmetry; triplblastic Recall: Prtstmes (characteristics) Deuterstmes (characteristics) Prtstmes 1. Lphtrchza have a lphphre (Definitin ) 2
3 P. Platyhelminthes Ex. Symmetry Number f tissue layers Digestive system yes r n Number f penings Gastrulatin (prtstme r Deuterstme) Circulatry system Yes r n Open r clsed Gastrvascular cavity with pening Cephalizatin eyespts vs. lateral flaps Nervus system Reprductin P. Rtifera Ex. Pseudcelmates Have rgan systems and a cmplete digestive tract (muth and anus) draws water int muth Parthengenesis Other types f eggs develp int males, but nly lng enugh t make sperm zygte drmant during unfavrable cnditins P. Mllusca Ex. Sft-bdied; mst prtected by a Bdy plan 3 main parts Fig pg. 656 Symmetry Number f tissue layers Digestive system yes r n Number f penings 3
4 Gastrulatin (prtstme r Deuterstme) Circulatry system Yes r n Open r clsed Radula Bth sexes; sme hermaphrdite Trchphre Celmates; pen circulatry system Ft acts as a C. Gastrpda Ex. Grazers and predatrs Sme are terrestrial with and withut shells (snail vs. slugs) C. Bivalvia Ex. Ft Mantle 4
5 N distinct head, n radula Path f water C. Cephalpda Ex. Built fr Carnivres; inject = immbilizatin Chambered nautiluses Mve using ; can pint in different directins Giant squid Clsed circulatry system; will-develped nervus system with cmplex brain; well develped eyes P. Annelida Ex. Symmetry Number f tissue layers Digestive system yes r n Number f penings Gastrulatin (prtstme r Deuterstme) Circulatry system Yes r n Open r clsed Nervus system Respiratry rgan = (diffusin) Metanephridia Regeneratin 5
6 3 classes: C. Oligchaeta Ex. Undigested fd exits thru anus Helps till the land head N parapdia (almst-feet lcmtin) C. Plychaeta Has setae (bristles) and parapdia Marine; crawl/ burrw n cean flr Tw well-adapted develpments in annelids: Ecdysza Definitin P. Nematda Ex. Symmetry Number f tissue layers Digestive system yes r n Number f penings 6
7 Gastrulatin (prtstme r Deuterstme) Circulatry system Yes r n Open r clsed Nn-segmented; pseudcelmates Exskeletn Reprductin/ Fertilizatin Imprtant in and Phylum. Arthrpda Ex. MOST SUCCESSFUL OF ALL ANIMAL PHYLA Symmetry Number f tissue layers Digestive system yes r n Number f penings Gastrulatin (prtstme r Deuterstme) Circulatry system Yes r n Open r clsed Exskeletn Jinted appendages Cephalizatin; well-develped sensry rgans Hemlymph Organs specialized fr gas exchange: Aquatic = Terrestrial = 4 main grups: Grups can be classified as phyla, subphyla, r classes depending n the scheme 7
8 Much segmentatin as arthrpds evlved, segments fused and number f segments decreased Chelicerates Ex. Chelicerae Cephalthrax and abdmen Class Arachnida Ex. One r tw main parts pairs f appendages: 1 pair 1 pair 4 pairs Gas exchange Spin silk webs Catches flying insects Spinning web = inherited trait 3. Uniramians Ex. 1 pair 1 pair appendages Class Diplpda Ex. pairs f legs per segment Class Chilpda Ex. pair f legs per segment Class Insecta Ex. Nw divided int several insect classes Mst diverse class Entmlgy pairs f wings (n thrax) 8
9 Wings Early functin f wings = Usually mate per lifetime Insects: HELPFUL HARMFUL 4. Crustaceans Ex. Mainly aquatic pair cmpund eyes Only arthrpds with 2 pairs f antennae Gas exchange Circulatry system Separate sexes Larval stages Several grups f crustaceans Hw many times did segmentatin evlve in animals??? - Still present (ex. vertebrae in backbne) - 3 theries: rigins f segmentatin Fig pg. 672 rigins f segmentatin rigin f segmentatin 9
10 Up t this pint.prtstmes nw. Deuterstmia P. Echindermata Usually center with spkes (sea stars) Thin skin cvers Water vascular system Reprductin Lk radial, but actually have symmetry All are marine C. Asteridea Ex. 5 r mre arms with tube feet n the underside (lcmtin, suctin, grasping prey) Digestive System 10
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