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Samenvatting Diagnose Groepen - Diversiteit van Dieren

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1e jaar Ba BIO aan UA

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ONYCHOPHORA
Meercellig? Ja
Gesegmenteerd? Ja, onvolledig, meest zichtbaar uitwendig maar ook
inwendig
Excretiesysteem? 1 paar metanephridia per segment
Coeloomvorming? Hemocoel
Larvaaal stadium? Neen, directe ontwikkeling
Vervelling? Ja
Ademhaling? Via trachea met spiracula
Spijsverteringsstelsel? Volledig
Bloedsomploop? Open, pericardiale sinus, dorsaal hart, 1 paar ostia per
segment
Symmetrie? Bilateraal symmetrisch
Zintuigen? Ogen, smaakpapillen, tastzintuigen, hygroscopische
receptoren
Voortplanting? Tweehuizig
Zustergoepen? • Tardigrada:
o Synapomorfieën:
- Gereduceerd tot hemocoel
- Niet-gelede aanhangsels met
klauwen
o Verschillen:
- Geen slijmpapillen
- Buizen van Malphigi
- Niet-chitineuze cuticula
• Arthropoda:
o Synapomorfieën:
- Gereduceerd tot hemocoel
- Chitineuze cuticula
o Homoplasie
- Tracheaal systeem
o Verschillen:
- Geen slijmpapillen
- Gelede poten
Extra? Blauwachtige mandibula, tachea, slijmklieren (voor
jacht)

, TARTDIGRADA
Meercellig? Ja
Gesegmenteerd? Enkel extern (Hickman), recent binnen Panarthropoda
homoloog
Excretiesysteem? Buizen van Malphigi (uit nephridia geëvolueerd)
Coeloomvorming? Enterocoel (Hickman)
Larvaaal stadium? Directe ontwikkeling, protostoom
Vervelling? Ja
Ademhaling? Via diffusie
Spijsverteringsstelsel? Volledig
Bloedsomploop? Open
Symmetrie? Bilateraal symmetrisch
Zintuigen? Primitief, gereduceerd oog = ocelli met lichtgevoelige
laag
Voortplanting? Ovipaar, meestal gescheiden geslachten soms
hermafrodiet en parthenogenese
Zustergoepen? • Onychophora en Arthropoda:
o Gelijkenissen:
- Segmentatie
- Ecdysis (vervelling)
- Buizen van Malphigi (A)
- Ventraal laddervormig
zenuwstelsel (O)
o Verschillen:
- Diffusie
- Buccale buis
- Styletten
- Ocelli
- Cirri
Extra? 4 paar poten met klauwtjes, eutelie (vast aantal cellen),
tonnetje als ultimate overlevingsstrategie

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Written in
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