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Fascinating World of Crayfish: Diverse and Unique Aquatic and Terrestrial Organisms

Discover the world of crayfish, a diverse group of water and land organisms without bones. Explore over 52,000 species, including the common yabby, land crab, lobster, and freshwater shrimp. Learn about their anatomy, behaviors, and habitats in oceans, freshwater, and on land. Find out how they defend themselves, reproduce, and move.

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Fascinating World of Crayfish: Diverse and Unique Aquatic and Terrestrial Organisms

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  1. RAKI

  2. Velika in raznolika skupina • Vodni in kopenski organizmi • Nevretenčarji – brez kosti • 52.000 vrst Navadni prašiček Kopenski rak Jastog Vodni rak KAJ SO RAKI?

  3. 14.000 vrst • Kozice, jastog, rakovice… • Morski, sladkovodni, kopenski • So veliki (izjeme so lahko centimetrske) • Pet parov nog za hojo, oprsne noge • Lov na rakce • Jadransko morje – 150 vrst DESETERONOŽCI Rakovica Kozice

  4. Morski • Potočni Rak samotarec VRSTE RAKOV Potočni rak jelševec

  5. Trden zunanji skelet – varuje, daje oporo • Telesna zgradba: raznoliki (mikroskopski večmetrski organizmi) • Vodni in kopenski organizmi (večinoma vodni) • Uspešna skupina ZGRADBA RAKOV Veliki morski pajek

  6. Prsni koš Členjen zadek Sestavljene oči Dva para tipalnic ZUNANJA ZGRADBA Trije pari čeljusti Plavalne nožice Klešče 2.-5. par nog

  7. Prebavila Krvožilni sistem Ustna odprtina žvekalnik sprednje, zadnje črevo zadnjična odprtina Odprt (srce, odvodnice) Ogrodje Hitinjača NOTRANJA ZGRADBA Živčevje Mišičje ~Trebušnjača ~Čutilne dlačice na tipalnicah ~Sestavljene oči

  8. Jajčeca • 3.- 4. leto • Premika naprej • S kleščami se brani RAZMNOŽEVANJE IN PREMIKANJE

  9. RAZVRSTITEV V BIOLOŠKI SISTEM

  10. Izguba klešč nove • So vsejedi, hranijo se z algami • Nevarnost umik • S tipalkami otipajo vse kar ni znano • Rakovica živi tudi v pristaniščih in dobro prenaša onesnaženo vodo • Hrana ljudem – različni recepti ZANIMIVOSTI

  11. Wikipedija;http://sl.wikipedia.org/wiki/Raki, http://sl.wikipedia.org/wiki/Deseterono%C5%BEci • Dijaski.net;http://www.dijaski.net/biologija/referati.html?r=bio_ref_raki_02__predstavitev.ppt • Učbenik za naravoslovje: AKTIVNO NARAVOSLOVJE 2 – Andrej Šorgo, Boris Čeh, Mitja Slavinec • Google slike; https://www.google.si/imghp?hl=sl&tab=wi&ei=SyyTU824GYu_ygP0lIKgBQ&ved=0CAQQqi4oAg • Svarog.si;http://mss.svarog.si/biologija/index.php?page_id=7885 VIRI

  12. HVALA ZA VAŠO POZORNOST!

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