Search found 526 matches

by Bruce Taylor
Sat Jan 23, 2021 8:35 pm
Forum: Resources (online, books etc.)
Topic: New book on my shelf
Replies: 1
Views: 71

Re: New book on my shelf

That's a translation of an older edition of a German book, Das Leben im Wassertropfen . It's a helpful introductory guide, with very nice pictures. The taxonomy is out of date, and it has the problem of all "field guides," which is that it shows only a small number of organisms, which could lead use...
by Bruce Taylor
Sat Jan 23, 2021 2:24 pm
Forum: Pictures and Videos
Topic: Is this Vahlkampfia?
Replies: 2
Views: 57

Re: Is this Vahlkampfia?

A very nice video! :) I'm pretty sure it's not Vahlkampfia , or any heterolobosean. It is quite big, for one thing ( Vahlkampfia species tend to be smaller, usually 20 μm or so). But more importantly, the style of locomotion is amoebozoan , with a steady flow of cytoplasm at the leading edge of the ...
by Bruce Taylor
Fri Jan 22, 2021 4:08 pm
Forum: Identification help
Topic: Spathidum sp ?
Replies: 3
Views: 38

Re: Spathidum sp ?

Or something common that didn't occur to me. :D ;) The habitat is relevant...I'll do a little search on ephemeral waters and see if anything turns up.
by Bruce Taylor
Fri Jan 22, 2021 3:15 pm
Forum: Identification help
Topic: Spathidum sp ?
Replies: 3
Views: 38

Re: Spathidum sp ?

Spathidium (and most spathidiids, with a few exceptions) would have a large contractile vacuole in the posterior of the cell. This critter has multiple CVs, with a slightly larger one in the posterior, but laterally positioned. The mouth is apical, and there is a concentration of dark pigment in th...
by Bruce Taylor
Thu Jan 21, 2021 2:03 pm
Forum: Pictures and Videos
Topic: Unknown amoeba-like protist
Replies: 3
Views: 74

Re: Unknown amoeba-like protist

That is an amoebozoan in its "floating form." When floating freely in the water column, many amoebae extend long radial pseudopods. When this one settles down on the substrate it will revert to its "locomotive form" and begin crawling forward, foraging. Amoebae in their locomotive forms are much mor...
by Bruce Taylor
Wed Jan 20, 2021 3:32 pm
Forum: Identification help
Topic: Acineria sp
Replies: 2
Views: 70

Re: Acineria sp

I think you have three different organisms here. The first one does resemble Trachelius , as you note. However, it lacks that ciliate's clear cytoplasm filled with large vacuoles, and Trachelius has only a single macronucleus (while the similar genus Apotrachelius has a scattering of small nodules)....
by Bruce Taylor
Tue Jan 19, 2021 6:13 pm
Forum: Pictures and Videos
Topic: Scyphidia?
Replies: 9
Views: 137

Re: Scyphidia?

As an aside, I do think amateur microscopists should get comfortable with identifying organisms to family, order or even higher groups. In recent years, it's become increasingly difficult to identify certain groups by looking at traits that are easily seen in the light microscope, and that trend is ...
by Bruce Taylor
Tue Jan 19, 2021 5:23 pm
Forum: Pictures and Videos
Topic: Scyphidia?
Replies: 9
Views: 137

Re: Scyphidia?

Keep an eye out for some that are still properly attached to its substrate (which is often another organism). Others in the same population might have longer stalks.
by Bruce Taylor
Tue Jan 19, 2021 5:01 pm
Forum: Pictures and Videos
Topic: Scyphidia?
Replies: 9
Views: 137

Re: Scyphidia?

Some researchers consider Rhabdostyla and Epistylis to be synonyms, so I wouldn't get too hung up on the question of how long the stalk needs to be. ;) (And one recent phylogenetic study has a Rhabdostyla sp. grouping with the stalkless Opisthonecta , within the family Epistylididae) In the case of ...
by Bruce Taylor
Tue Jan 19, 2021 1:49 pm
Forum: Pictures and Videos
Topic: Scyphidia?
Replies: 9
Views: 137

Re: Scyphidia?

The first one is a sessile peritrich that has lost its stalk. ;) in this case, it appears to be a Campanella (the very large peristomial lip is characteristic). There are also free-swimming peritrichs that lack stalks entirely ( Astylozoon , Opisthonecta , Telotrochidium ). Scyphidia , however, lack...
by Bruce Taylor
Sun Jan 17, 2021 1:42 pm
Forum: Identification help
Topic: ... from the usual pond ...
Replies: 1
Views: 137

Re: ... from the usual pond ...

A flatworm in the family Dalyelliidae, I think. Maybe someone who knows their worms can narrow it down. :)
by Bruce Taylor
Sat Jan 16, 2021 3:12 pm
Forum: Identification help
Topic: Hopefully I've got these ones right.
Replies: 2
Views: 96

Re: Hopefully I've got these ones right.

Sessile peritrichs are identified by their stalks. Vorticella (like the nearly-identical Pseudovorticella ) has a long, spirally contractile stalk with a wavy spasmoneme down the shaft. It is difficult to see whether your creature has no stalk at all (in which case it is Scyphidia ) or a very short ...
by Bruce Taylor
Sat Jan 16, 2021 2:58 pm
Forum: Identification help
Topic: Unidentified organism
Replies: 4
Views: 154

Re: Unidentified organism

Actinosphaerium is a very different organism, with a highly vacuolated surface, tapered axopodia, and no surface scales or spicules (it is no longer included in Heliozoa, but shares a supergroup with diatoms, kelp and water moulds!). Your critter is a true heliozoan, with an outer covering (peripla...
by Bruce Taylor
Fri Jan 15, 2021 2:05 pm
Forum: Identification help
Topic: Walking ciliate?
Replies: 1
Views: 109

Re: Walking ciliate?

No, not Aspidisca , or any euplotid. These guys are not walking, but swimming very close to the substrate, feeding by thigmotaxis. The one on the left, at the beginning of the video appears to be a hymenostome (subapical mouth, membrane is visible, Tetrahymena , Glaucoma , etc). The flattened fellow...
by Bruce Taylor
Fri Jan 15, 2021 1:56 pm
Forum: Identification help
Topic: A couple more ciliates I need help with.
Replies: 1
Views: 75

Re: A couple more ciliates I need help with.

The first one is a species of Frontonia . We don't see the mouth, but the cell is flattened, ovoid, not rotating in motion; we see trichocysts and a subtly pointed posterior. The diet and feeding behaviour (rubbing up against debris like a cat) is very typical. The second video is a deformed or dama...
by Bruce Taylor
Wed Jan 13, 2021 5:40 pm
Forum: Pictures and Videos
Topic: Very strange looking ciliate
Replies: 1
Views: 85

Re: Very strange looking ciliate

It's a piece of a badly mutilated ciliate. Small scraps of ciliates will often keep swimming, and even foraging, after catastrophic damage (if sufficient macronuclear material is intact, a mangled cell can sometimes regenerate). This one looks like a chunk of Spirostomum.
by Bruce Taylor
Wed Jan 13, 2021 1:59 pm
Forum: Identification help
Topic: Paramecium & Euglena
Replies: 1
Views: 351

Re: Paramecium & Euglena

Paramecium, but not necessarily "caudatum." There are many species with a similar shape, and distinguishing them is difficult, requiring good measurements of multiple specimens and a view of the micronuclei (and, within species complexes such as P. aurelia, breeding experiments).
by Bruce Taylor
Wed Jan 13, 2021 1:54 pm
Forum: Identification help
Topic: Spirostomum sp?
Replies: 2
Views: 89

Re: Spirostomum sp?

Yup, Spirostomum minus (moniliform macronucleus, peristome less than half cell length).
by Bruce Taylor
Wed Jan 13, 2021 3:02 am
Forum: Pictures and Videos
Topic: Amphileptus
Replies: 3
Views: 209

Re: Amphileptus

A very nice video! This is probably Litonotus, not Amphileptus (one subterminal contractile vacuole, extrusomes along proboscis with a second small group at the posterior of the cell).
by Bruce Taylor
Sun Jan 10, 2021 1:42 pm
Forum: Identification help
Topic: Which organelle?
Replies: 1
Views: 229

Re: Which organelle?

I see a lot of granular matter in the cytoplasm, jiggling in the usual way (Brownian motion). The particles could include all sorts of cellular stuff...secretory vesicles and their products, ribosomes, ingested material, endosymbionts, etc. At 5:08, a membrane bursts and some of them spill into an a...
by Bruce Taylor
Sat Jan 09, 2021 7:43 pm
Forum: Identification help
Topic: A vibrating stentor.
Replies: 2
Views: 156

Re: A vibrating stentor.

I'm not sure what is causing the vibration, but the Stentor is probably fragmentary (a contracted part of a damaged cell). It is possible that the shuddering is caused by the adoral membranelles beating rhythmically, against the substrate, forcing the small, untethered cell to move erratically (imag...
by Bruce Taylor
Sat Jan 09, 2021 7:35 pm
Forum: Identification help
Topic: This is a strange one any ideas.
Replies: 2
Views: 143

Re: This is a strange one any ideas.

It could be the contracted stalk of a dead peritrich. It seems rather thick, like Apocarchesium . Or, it could be something else altogether. :D These videos appear quite small on my computer screen, without a lot of color. The thing you're calling the "head" in the second video looks, to me, like a ...
by Bruce Taylor
Sat Jan 09, 2021 1:28 pm
Forum: Pictures and Videos
Topic: Ciliate frenzy.
Replies: 7
Views: 501

Re: Ciliate frenzy.

Beautiful! Nothing brings out Tetrahymena like a dead arthropod. :D
by Bruce Taylor
Fri Jan 08, 2021 10:59 pm
Forum: Pictures and Videos
Topic: Holophrya?
Replies: 2
Views: 159

Re: Holophrya?

It is certainly in Holophryidae. In addition to the oral basket you mentioned, we see a compact, single macronucleus, a terminal CV, and a short dorsal brosse (a structure of specialized cilia in the vicinity of the mouth). Identification of Holophrya itself got a bit more difficult early last year,...
by Bruce Taylor
Fri Jan 08, 2021 5:02 pm
Forum: Identification help
Topic: Are these Campanella Umbellaria ?
Replies: 2
Views: 117

Re: Are these Campanella Umbellaria ?

You are right. :D In addition to the non-contractile stalk, we see dark cytoplasm and a very thick peristomial lip (caused by multiple windings of peristomial cilia, which are also visible here as dark lines on the lip). A very minor note: the second part of the binomial should be in lower case. So,...
by Bruce Taylor
Thu Jan 07, 2021 11:22 pm
Forum: Identification help
Topic: Any help on these ID's.
Replies: 2
Views: 151

Re: Any help on these ID's.

First one is an ostracod, or seed shrimp (a crustacean, not a ciliate).

Second one is Amphileptus pleurosigma.

Third is Stentor coeruleus.
by Bruce Taylor
Thu Jan 07, 2021 2:47 pm
Forum: Identification help
Topic: Not a clue
Replies: 3
Views: 193

Re: Not a clue

Lorica with stalk, no valve = Cothurnia. Colin Curds published a revision of the genus in the early 90s: https://www.biodiversitylibrary.org/part/74230#/summary
by Bruce Taylor
Tue Jan 05, 2021 4:06 am
Forum: Identification help
Topic: Tailess Vorticella or Epistylis?
Replies: 2
Views: 284

Re: Tailess Vorticella or Epistylis?

The peritrich ciliate in the first video has come loose from its stalk, so it can't be identified below order, Sessilida. Yes, it could be Vorticella ...or Pseudovorticella , Carchesium , Haplocaulus , Epicarchesium , etc. A clear view of the stalk can usually get the ID down to family. However, get...
by Bruce Taylor
Sun Jan 03, 2021 11:49 pm
Forum: Identification help
Topic: ...a strange encounter...
Replies: 3
Views: 282

Re: ...a strange encounter...

Well, that's fairly odd. :D Do you have more pictures...or, better, video?
by Bruce Taylor
Sat Jan 02, 2021 4:35 pm
Forum: Pictures and Videos
Topic: Chilodonella
Replies: 9
Views: 474

Re: Chilodonella

Yes, really clear video! Chilodonella uncinata is likely.