Video: https://youtu.be/sbhyYP1B7h0
Sampling location: A water sample was collected from the bank of the Ufa River within the boundaries of Nyazepetrovsk town.
Date and time of collection: 18 Jun 2023 at 6 PM
Date and time of observation: 20 Jun 2023 at 8 PM
The sample was stored at room temperature in a plastic container.
Mag. 200x
Large (≥250µ long when near completely extended), colorless euglenoid. Long anterior flagellum. An amazing contortionist (metabolic motion), see 1-6 sequence image 2 (be sure to enlarge).
A Lake water sample (freshwater) was taken on 11/06/2021 using a 10 micron dip net to enrich for microorganisms.
Water sample collected from the river San Pedro, at Las Puentes, Meoqui, Chihuahua, at the indicated location.
The samples was collected on January 7th at 15:41. Images were acquired on January 8th.
A Lake water sample (freshwater) was taken on 11/06/2021 using a 10 micron dip net to enrich for microorganisms.
Probably Peranema, but no clear as some images show a red spot than could be stigma.
all are from a 200ul flush from the roots of this water fern https://www.inaturalist.org/observations/35935190
Rigid, colorless, freshwater euglenoid with one emergent flagellum I believe.
Water sample collected at river Conchos, Julimes, Chihuahua, on December 5th at the indicated location and time.
The images were acquired on December 8th.
A Lake water sample (freshwater) was taken on 11/06/2021 using a 10 micron dip net to enrich for microorganisms.
Mag. 400x
Very small heliozoan (~10µ diamter). Actinophrys does have marine members, but I don't know how small they are. Another possibility is Ciliophrys, a small marine actinophrid heliozoan, https://www.arcella.nl/ciliophrys-infusionum/ and https://www.researchgate.net/publication/296882090_Taxonomy_and_Phylogeny_of_Heliozoa_III_Actinophryids.
From one of the main tidal channels of the salt marsh, a water sample was taken on 11/10/2021 using a 10 micron dip net to enrich for microorganisms.
Continued observation of a sample collected 20210314 from a river tributary, scoop of sediment near the bank.
Three different shells.
Genus Hyalosphenia?