possible diatom Entomoneis ornata

[jc maccagno]

fresh water lake 40 100X objective

[Gyrosigma]

Hello JC,
alata, ornata... too much difficult to give the spiecie...
For the genus OK with Entomoneis wich is called Amphiprora today
But.... it's a marine genus !!! is your lake far from the sea ????

regards

Dominique

[jc maccagno]

Bonjour Dominique

Thank you for your comments. Our community is 400 Km from the ocean
The elevation here is 377 m and the sample was collected from a small mountain pond called Deep Lake,another 400m in elevation.
My sources indicate that the suggested name for this diatom is Entomoneis
and this has replaced its previous name of Amphiprora.

While this genus is not widely seen in freshwater,it has been reported in Michigan("Freshwater Alga of the United States Gilbert Smith 2nd addition pp 497..he states that E.ornata is the only freshwater species known in the USA).

As well please check this site which states that it is found in the Great Lakes of Canada and the USA

www.keweenawalgae.mtu.edu/gallery_pages/diatoms5.htm

The textbook The Diatoms: Biology & Morphology of the Genera
By Frank Eric Round, R. M. Crawford, D. G. Mann pp 632 also indicates that it can be found in freshwater. It seems to be rare but perhaps it just hasn't been looked for. Perhaps others will report freshwater sightings as well.

I will try Deep Lake again and other mountainous pools this spring.

Kindest regards and thank you again for your comments

John