CHORDATES Výukový materiál OR 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/ Tento projekt je spolufinancován ESF a SR ČR
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)
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
CHORDATES Tunicates sea animals Tunic – a jelly layer, which is excreted by skin the notochord only by larvae representatives: the sea squirts the thaliacea
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
CHORDATES the thaliacea: a part of plankton in all seas a difficult reproduction (changing of sexual and asexual reproduction) floating in water transparent
A thaliacea
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
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
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?
Source: DOBRORUKA, Luděk J. Přírodopis pro 7. ročník základní školy. 1. vyd. Praha: Scientia, 1998, 152 s. ISBN Obrázky: (osvobozeno od autorských práv)