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Samenvatting hoofdstuk 3: Platyhelminthes, Nematoda, Annelida

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In dit document vind je een gedetailleerde samenvatting van de les Biodiversiteit en ecologie van invertebraten in verband met de wormen. Volgende topics wormen besproken (per fylum!): - Fylogenie: Morfologische boom versus moleculaire boom - Algemene kenmerken: soortenaantal, habitat, weetjes,... - Anatomie - Voortplanting - Voeding - Verspreiding - Predatie - Verdediging - Symbiose - Gevolgen van humanitaire doeleinden

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December 20, 2025
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Written in
2025/2026
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PLATYHELMINTHES/ PLATWORMEN, NEMATODA/ RONDWORMEN, ANNELIDA/
RINGWORMEN
 Fylogenie

- Morfologisch vs. Moleculair
- Zustergroepen: Annelida en Nematoda vs. Annelida en Platyhelminthes




1. Platyhelminthes/ Platwormen




 Algemene info

- Acoelomata: Geen lichaamsholte tussen verteringsholte en lichaamswand
- Geen hemal systeem (circulatiesysteem met bloedvaten en sinussen)
- Geen epidermis en soms geen darm bij parasitaire soorten (dus enkel
Turbellaria)
- Geen cuticula (vetlaag op epidermis)  Zacht lichaam  Fragiel
- Meestal klein
- Aquatisch
- 20.000 soorten
 Turbellaria: 4500 soorten
 Trematoda: 8400 soorten
 Monogenea: 1100 soorten
 Cestoda: 6000 soorten

,  Fylogenetische opdeling

- 4 klassen
 Turbellaria
 Trematoda
 Monogenea (niet besproken)
 Cestoda

1.1Turbellaria/ Vrijlevende platwormen

 Algemene info

- Aquatisch: Marien
- Vochtig terrestrisch
- 2 groepen op basis van grootte
 Microturbellaria: mm’s, max. 0,5 mm
 Macroturbellaria: cm’s, max. 60 cm

 Lichaamswand




- Éénlagig
- Epidermis
 Gecilieerd  Locomotie (ook door musculatuur)
 Rijk aan klieren: Duo-klier-adhesieve papilla:
Viskeuze klier produceert adhesief en mucus (vasthangen aan rotsen)
Loslatende klier produceert ontadhesief (loskomen van rotsen)
- Ondersteuning
 Terminaal web: intracellulair, webachtig blad uit actinefilamenten
 Basale lamina




 Anatomie
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