Käyttäjän djpmapfer tunnistukset

Video: https://youtu.be/ON9Mpyp0foc

Photos are snapshots of the same individual in the video

Cell size: 6 µm in length

Site of collection: Pavilion, Takamori Higashi Park (a freshwater habitat), Sendai, Japan

Date of collection: March 28th 2021

Weather: Cloudy

Water temp.: 11.5°C

pH 6.4

Date of observation: April 24th 2021 (the collected sample in a plastic container was left near a window out of direct sunlight at room temperature until observation)

Bright field observation using a Wraymer microscope (model BX-3500TL, Osaka, Japan) equipped with a Floyd-2 HDMI ethernet digital camera (Wraymer, Osaka, Japan). The accuracy of the scale bar, which was set according to the guidance of the manual of the software (Spectman) provided for the camera, was confirmed by using a stage micrometer glass slide (1 div. = 10 µm; Wraymer, Osaka, Japan) at each magnification.

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

• A pond-side water sample (retentate) was taken on 01/06/2024 using a 10µ dip net to enrich for microorganisms. (The shoreline had a layer of ice about 1/4" thick that needed to be breached in order to accommodate the dipnet. The retentate contained a lot of sediment due to the shallow depth and disturbance caused by the net.) Air temp 35F.

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).

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.