Summary
Samenvatting Toegepaste Dierkunde: sponzen
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Samenvatting Toegepaste Dierkunde: dieren: enkel sponzen!
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Stam: Sponsen (Porifera) Overgang van rijk eencelligen naar dieren (oftewel
meercelligen)
o Volvox aureus
Kolonie van 10000 tal cellen verbonden
door cytoplasmatisch uitlopers omgeven
door gelachtige stof
Algemene kenmerken
- Voor 1765: behoren tot het plantenrijk
- Ongewervelde dieren
- Verschillende vormen
- Bezitten geen voor- of achterkant, mond of anus, geen weefsels.
- Dieren zonder spieren, zenuwstelsel, huid.
o Geen lichaamssymmetrie
- Zijn vastzittende dieren (vb. op stenen of op andere dieren)
- Zoet en zee water
- De natuurspons: die in bad of huishouden gebruikt wordt.
o Overblijfsel van het dier nadat de cellen zijn verwijderd
o Niet meer dan het skelet
Indeling van de stam
- Klasse 1: Kalksponzen (Calcarea)
o Skelet van kalknaalden (spicula)
o Leven in ondiepe warme kustwater
o Klein
- Klasse 2: Glassponzen (Hexactinellida)
o Skelet bestaande uit kiezelzuur
o Vaas- of schotelvormig
o Komen voor in alle zeeën op grote diepte
o Middelmatige grootte
- Klasse 3: Gewone of hoornsponzen (Demospongiae)
o Skelet uit netwerk van sponginedraden
o Vaas, waaier- of kussenvormig.
o Opvallende kleuren
Bepaalde pigmenten zorgen voor kleur
o Klasse van zoetwatersponzen.
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