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Samenvatting hoofdstuk 6: Porifera
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Volledige samenvatting van hoofdstuk 6 gebaseerd op lesnotities en de cursus
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HOOFDSTUK 6: Porifera1. Inleiding en diagnose
Morfologie
- Multicellulair
- GEEN echte weefsels of organen
- Asymmetrisch of radiale symmetrie
- HEBBEN kleine ostia (water in lichaam) of oscula (water uit lichaam)
- Water IN BEWEGING GEBRACHT DOOR choanocyten
- Endoskelet en/of spicula
Fysiologie
- Individuele, niet-gecoördineerde cellen
- Osmoregulatie DOOR kloppende vacuoles
Voortbeweging
- Adulten sessiel
- Larven zwemmen d.m.v. flagellen
Voortplanting
- Sexueel MEESTAL hermafrodiet
- Asexueel DOOR knopvorming
Ontwikkeling
- Embryo ZONDER kiemlagen
- Indirecte ontwikkeling (via een larvestadium)
Habitat
- Vrijlevend IN water
- MEESTAL marien
- Wereldwijde verspreiding
Grootte
- 1mm – 2 m
Diversiteit
- Ongeveer 9,000 beschreven recente soorten
, 2. Bouwplan
2.1. Celtypes
- AGGREGAAT VAN cellen
- Centrale holte OPENEND VIA osculum
- Vertering intracellulair
- Porocyten VERBINDING buitenwereld
- GEEN echte weefsels VERSCHILLENDE celtypen
o Buitenlaag
pinacocyten: plaatvormig, polygonaal, contractiel
porocyten: doorboorde cellen
o Mesoglea
geleiachtig
spiculae
skleroblasten aanmaak spiculae
amoebocyten vertering
archaeocyten ongedifferentieerd
myocyten contractiel
o Binnenlaag
choanocyten
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