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Samenvatting Biologie H5: Parazoa
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Samenvatting gebaseerd op de cursus van professor Moens, alles wat je moet kennen van theorie voor dit onderdeel.
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Samenvatting H5: ParazoaInhoud
5.1 Definitie en ontstaan........................................................................................................................1
5.2 Porifera.............................................................................................................................................1
5.2.1 Inleiding.....................................................................................................................................1
5.2.2 Basisbouwplan: het ascontype..................................................................................................2
5.2.3 Complexere bouwplannen.........................................................................................................3
5.2.3.1 Sycontype............................................................................................................................3
5.2.3.2 Leucontype.........................................................................................................................4
5.3 Fylum Placozoa.................................................................................................................................4
5.1 Definitie en ontstaan
- Metazoa= Animalia = rijk
o Parazoa & Eumetazoa = subrijk
Parazoa: Porifera & (Placozoa)= fylum
Niet zeker of Placozoa tot Parametazoa behoren
Verschillen van Eumetazoa doordat parazoa nog geen echte weefsels
hebben
- Choanoflagellata= fylum eencelligen
- Animalia & Choanoflagellata zouden een gemeenschappelijke voorouder delen
o Choanoflagellaten lijken structureel perfect op de choanodermcellen van Porifera
- Kolonietheorie
o Metazoa zouden afstammen van een koloniale choanoflagellaat: Proterospongia
heackeli
o Proterospongia
= sessiele/vastzittende flagellaat
Geflagelleerde cellen vormen een bolletje met kragen naar buiten gericht
Elke cel in dit koloniale verband doet hetzelfde geen differentiatie of
taakverdeling tussen cellen aanwezig
- Evolutie: van choanoflagellata naar Animalia
o Verdergaande differentiatie + functionele specialisatie en integratie van cellen in
meer complex verband 1 levend organisme
o Eerste Animalia= Protometazoa
Verschillen van Proterospongia
Doordat ze meer dan 1 celtype bezitten
Er is nauwer contact tussen cellen
Hebben meerlagige organisatie: binnenste en buitenste laag
ontwikkelen elk hun eigen functies
5.2 Porifera
5.2.1 Inleiding
- Porifera= sponzen= eenvoudigste meercellige dieren
1
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