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Ciliata
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Lovely images and an interesting find. I wonder how many you had? Ji & Kusuoka (2009) note this kind of form occurs in newborn colonies of Carchesium, before the branches grow in. But otherwise it is characteristic for their new genus Apocarchesium, as shown for instance in Moreno's photos here and here, with cells all attached directly to a plate on a stalk with a helical contractile filament.
Those are also distinct in forming macrozooids like Zoothamnium, which have a zig-zag filament, though not all colonies do. It might be worth asking a ciliatologist about; Apocarchesium are plainly uncommon and Horn & Foissner (2010) considered the species flagships, so I imagine new reports could still be of interest.
Those are also distinct in forming macrozooids like Zoothamnium, which have a zig-zag filament, though not all colonies do. It might be worth asking a ciliatologist about; Apocarchesium are plainly uncommon and Horn & Foissner (2010) considered the species flagships, so I imagine new reports could still be of interest.
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