An amoebozoan in order Leptomyxida?

[hans]

100x objective, bright field, contrast enhanced in software. Scale of the video is 84 nm/pixel and the amoebozoan is roughly 20 um. Speed increased 8x. (Original recording 30 FPS, frames combined 4:1, encoded for playback at 60 FPS.) All three segments are tracking the same amoebozoan.

I am thinking the morphotype is rhizomonotactic? There are large hyaline caps I see what look like trailing adhesive uroidal filaments occasionally visible in the video:

[Bruce Taylor]

Very cool. I'm not sure it's amoebozoan. The pseudopod formation looks somewhat "eruptive", to me, so this might be a heterolobosean amoeba, such as Valhkampfia. However, as I believe I've mentioned before, I'm not too comfortable identifying amoebae.

[hans]

Ah, I saw the "eruptive" description while browsing but was not sure what that would look like, will reconsider, thank you.

[hans]

I'm not sure it's amoebozoan. The pseudopod formation looks somewhat "eruptive", to me, so this might be a heterolobosean amoeba, such as Valhkampfia.

After watching some videos of eruptive pseudopod formation on Ferry Siemensma's YouTube channel and web site, this makes more sense. There is an amoebozoan genus Rhizamoeba described as eruptive, but in the videos I watched of those the eruptive character is not nearly as dramatic as in the examples from Heterolobosea and the video I took.