zglavkari; rakovi
TRANSCRIPT
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Zglavkari
Ivana Damnjanović
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najrasprostranjenija grupa životinja člankovito telo; člankovite noge telo je zaštićeno kutikulom od hitina
glavagrudi
trbuh
glavenogrudni region
telo građeno od članaka spojenih u tri celine:
Glava
Grudi Trbuh
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Snažno razvijeni mišići Tokom rasta, zglavkari se presvlače (staru kutikulu zamenjuju novom
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Dobro razvijena čula (dodir, miris, toplota) na antenama Čulo sluha Složene oči
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Sistem organa za varenje
Analniotvor
Usni otvor
Prednje crevoSrednje crevo
Zadnjecrevo
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Otvoren krvni sistem Disanje: škrgama, plućima, trahejama (cevčice) Izlučivanje: posebne cevčice
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Polno razmnožavanje Odvojenih polova Kod nekih grupa je zastupljen stadijum larve
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ZGLAVKARI
Paukoliki zglavkari
Pauci
Škorpije
KrpeljiKosci
Rakovi Stonoge
Insekti
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RAKOVI
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Rečni rak
Živi u čistim, slatkim vodama Danju je sakriven Lovi noću (grabljivica)
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Telo je zaštićeno kutikulom (oklop) Boja tela se prilagođava okolnoj sredini Prisutno je presvlačenje
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Glavenogrudni region
Trbušni region
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složeno oko
kraće antene
duže antene
repna lepeza trbuh 5 pari nogu za hodanje
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Usne nožice
Na grudnom delu se nalaze 3 para nogu za prenošenje hrane
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Na trbuhu se nalaze noge koje služeza plivanjeMogu imati ulogu i u disanju, nošenju jaja, mladunaca
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Repna lepeza
(plivanje unazad)
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Sistem organa za varenje
Dobro razvijen želudac Iz jetre se u crevo se izlivaju sokovi za varenje
Usni otvor
Želudac
Jetra
Crevo
Analniotvor
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Krvni sistem je otvoren Dišu pomoću škrga
Škrge
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Nervni sistem je lestvičast
Nervna lestvica
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Čula su dobro razvijena Složene oči Mozaični vid
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Izlučuju preko posebnih antenalnih žlezda
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Razmnožavaju se polno Odvojenih su polova Unutrašnje oplođenje Stadijum larve u razviću
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antenalne žlezdeotvoreni krvotok
lestvičastnervni sistem
crevo škrge
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Raznovrsnost i značaj rakova
Žive pretežno u vodi (mora) Ima ih na kopnu Paraziti Plankton Ima i sesilnih vrsta
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Planktonski rakovi
Dafnija-vodena buva Ciklops
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Kril
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Jastog
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U različitim jezicima ih različito zovu – kradljivci palminih oraha, kokosovi rakovi. Vrsta Birgus latro živi na Božićnim ostrvima. Ovi rakovi su veliki i imaju zapanjujuću sposobnost koordinacije.
Najveći kopneni rakovi na svetu
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Stygotantulus-najsitniji rak
Japanski div- morski pauk ima raspon ekstremiteta i do 3.6m
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Mokrica-kopneni rak
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Značaj rakova
Hrana mnogim životinjama Za ishranu ljudi Čistači u prirodi
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HVALA NA PAŽNJI :)