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CHORDATES

CHORDATES. Výukový materiál OR 03 - 72 Tvůrce: Mgr. Alena Výborná Tvůrce anglické verze: Mgr. Miloslava Dorážková Projekt: S anglickým jazykem do dalších předmětů Registrační číslo: CZ.1.07/1.1.36/03.0005 Tento projekt je spolufinancován ESF a SR ČR. CHORDATES.

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CHORDATES

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  1. CHORDATES Výukový materiál OR 03 - 72 Tvůrce: Mgr. Alena Výborná Tvůrce anglické verze: Mgr. Miloslava Dorážková Projekt: S anglickým jazykem do dalších předmětů Registrační číslo: CZ.1.07/1.1.36/03.0005 Tento projekt je spolufinancován ESF a SR ČR

  2. CHORDATES • They differ from invertebrates: • 1) presence of the notochord • 2) a dorsal nerve cord (a nerve cord is formed into a brain and a spinal cord by developmentally higher organisms) • 3) there are pulsating vessels or a heart on the abdominal side • 4) they have a tail (the end part of the body behind the anal orifice)

  3. CHORDATES • the most developed phylum of animals • they live in all environments • early primary – they were developed to the life in fresh water where vertebrates were formed • late primary – vertebrates were adopted to the terrestrial life completely • size 0,3 mm- 27 cm

  4. CHORDATES • Tunicates • sea animals • Tunic – a jelly layer, which is excreted by skin • the notochord only by larvae • representatives: • the sea squirts • the thaliacea

  5. CHORDATES • thesea squirts: • in all seas • in a circumlittoral zone • some of them in depth up to 5000 m • a big regenerative ability • in adulthood fixed

  6. CHORDATES • the thaliacea: • a part of plankton in all seas • a difficult reproduction (changing of sexual and asexual reproduction) • floating in water • transparent

  7. A thaliacea

  8. CHORDATES • Cephalochordata: • only one group is included • Branchiostoma: • 6 cm big animals • they live in sand shallows of warmer seas • they are similar to small fish

  9. CHORDATES • their body is pointed • during the day they are buried in sand, at night they swim by the surface • movement – lateral waving • the food is small water organisms and their remains

  10. REVISION: • 1) How do chordates differ from invertebrates? • A) • B) • C) • D) • 2) We count among tunicates….. • 3) We count among the cephalochordata…………… • 4) How do the branchiostomamove? • 5) Does sea squirt move or livesessily?

  11. Source: • DOBRORUKA, Luděk J. Přírodopis pro 7. ročník základní školy. 1. vyd. Praha: Scientia, 1998, 152 s. ISBN 80-718-3134-4 • Obrázky: http://commons.wikimedia.org (osvobozeno od autorských práv)

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