Didinium nasutum or Didinium gargantua ?

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Franz Neidl
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Joined: Wed Jan 14, 2009 11:59 am
Location: Italy

Didinium nasutum or Didinium gargantua ?

Post by Franz Neidl »

I found this ciliate (100µm long) in marine plankton. I am sure that this is a Didinium, but I dont know if it is Didinum nasutum or Didinium gargantua. I am more inclined to D. gargantua.
2 pictures in DIC, Obj. 40x

Franz


Image


Image

Jacek
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Location: Poland

Post by Jacek »

Super pictures, it is hard to grasp Didimium

Bruce Taylor
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Location: Wakefield, Quebec / Ottawa, Ontario
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Post by Bruce Taylor »

Wonderful pictures. :)

I would think it's D. gargantua Meunier, because:

1. It has very prominent nematodesmata.
2. The anterior ciliary fringe is located down on the "shoulders" (in nasutum it is supposed to be a little further forward).
3. It was collected in a marine environment (nasutum is found in brackish conditions, but is mainly a freshwater species).
4. The "snout" is relatively plump.

Franz Neidl
Posts: 747
Joined: Wed Jan 14, 2009 11:59 am
Location: Italy

Post by Franz Neidl »

Bruce, thank you very much for your precious help. With your detailed reasons you've convinced me.

Franz

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