Mag. 400
D. archeri?, though I'm confused by the presence of two cell types. The larger, cyst-like cells appear to be intimately associated with the colony, but do they derive from D. archeri (cysts for long term survival?) or are they parasitic or epiphytic cells exploiting the Diplophrys colony? I could not find a literature reference regarding the ability of D. archeri to form cysts.
The first 3 images provide a close-up view. Images 4 - 9 were taken periodically over a ~9 minute interval as the colony consolidated. The YouTube video spans this same time interval (5, ~15 second videos catenated in a single video): https://youtu.be/ZJ2OV10jLvU.

• A pond-side water sample was taken on 12/27/2021 using a 10µ dip net. About 1/4" of ice had to be broken and pushed aside to access the water. Air temp. 36°F.