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Samenvatting hoofdstuk 14 biosfeer dieren R69,15   Add to cart

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Samenvatting hoofdstuk 14 biosfeer dieren

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Dit is een samenvatting van de slides en de geziene leerstof in de les Biosfeer dieren, gegeven door Wim Bert. De extra uitleg in het handboek is hier NIET in verwerkt

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  • January 28, 2024
  • 6
  • 2023/2024
  • Summary
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Hoofdstuk 14: Deutrostomia en
non-chordata
Deutrostomia  heel variabele groep, maar de ontwikkeling is gelijkaardig




Fylum Chaetognatha
= pijlwormen

 0.5-12 cm
 Evolutionaire positie is nog altijd niet uitgeklaard
ontwikkeling eerder deuterostom
 moleculaire data wijzen eerder richting Protostomia
 predators (vooral copepoden), aanpassing planktonische levenswijze, diurnale migratie
 Horizontale vinnen rond de romp voor drijfvermogen, achterste vin hoofdzakelijk propulsie
 afwisseling voortbeweging en drijven
 krachtig neurotoxine

, Fylum Echinodermata




= stekelhuidigen

 Sessiele of traag bewegende dieren; geen parasieten (beperking bouwplan)
 mesoderm> endoskelet bestaande uit beentjes of platen.
 Elke plaat = poreuse structuur uit calcium carbonaat
= stereom structuur
 watervatenstelsel
 Extern-intern radiaal symmetrisch (pentaradiaal): 5 radiale assen
 larvale vormen wel bilateraal symmetrisch
 sterk gereduceerd zenuwstelsel (secundaire reductie)
 nauw verwant met gewervelde dieren
 Sinds pre-Cambium
 Heel succesvol i/h Paleozoïcum
 Poreus skelet
 Marien

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