CHORDATES Výukový materiál OR 03 - 72 Tvůrce: Mgr. Alena Výborná Tvůrce anglické verze: Mgr. Miloslava Dorážková Projekt: S anglickým jazykem do dalších.

Prezentace na téma: "CHORDATES Výukový materiál OR 03 - 72 Tvůrce: Mgr. Alena Výborná Tvůrce anglické verze: Mgr. Miloslava Dorážková Projekt: S anglickým jazykem do dalších."— Transkript prezentace:

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 the sea 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 branchiostoma move? 5) Does sea squirt move or live sessily?

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)http://commons.wikimedia.org