Search found 166 matches

by actinophrys
Sun Jun 07, 2020 4:48 pm
Forum: Pictures and Videos
Topic: Aeolosoma?
Replies: 7
Views: 440

Re: Aeolosoma?

This is not actually a segmented worm like Aeolosoma, but a flatworm. I am not quite used to them in this kind of lighting but I think it shows the sensory pits associated with Stenostomum.
by actinophrys
Mon May 25, 2020 5:58 pm
Forum: Pictures and Videos
Topic: Hungry fella
Replies: 5
Views: 390

Re: Hungry fella

This is one of the Naididae, microscopic worms from the same major group as earthworms. I am not an expert but think the proboscis and the extra long second pair of setae mark this one as Pristina.
by actinophrys
Thu Apr 30, 2020 3:54 am
Forum: Pictures and Videos
Topic: My First Video
Replies: 4
Views: 911

Re: My First Video

A nice start. This is a colpodid ciliate (the best known of which are Colpoda , but now there are some other very similar members of the family, depending on the taxonomy you follow). They're very typical of samples with soil or vegetation that dry out from time to time, being adapted to form protec...
by actinophrys
Thu Apr 30, 2020 3:52 am
Forum: Beginner's corner
Topic: Specimen ethics
Replies: 42
Views: 5057

Re: Specimen ethics

Not to repeat the other threads too much, but for the record: I always put mine back when I'm done unless there is a special reason not to, as in a case where the specimens proved of actual scientific interest. Otherwise this is a hobby; I'm observing them for pleasure, and it certainly doesn't give...
by actinophrys
Fri Mar 06, 2020 7:13 pm
Forum: Beginner's corner
Topic: Discovery of Microorganisms + Advice on Research Microscope
Replies: 33
Views: 15967

Re: Discovery of Microorganisms

Just out of curiosity, any reason to single out bacteria? The case I know for sure of an amateur discovering a new species, albeit still to be described in full, is an amoeba found by Bruce Taylor . And for anyone here inclined to say "sure, but he's barely an amateur", I've also come relatively clo...
by actinophrys
Sun Feb 09, 2020 9:30 pm
Forum: Pictures and Videos
Topic: Rotifer Birth
Replies: 6
Views: 3052

Re: Molting Time

Extremely neat! It is indeed a bdelloid rotifer; this one looks like Rotaria, which usually have a distinctive pair of eyes on the rostrum, visible here around 1:44. The other types with live birth are mostly Dissotrocha and Embata with eyes on the neck.
by actinophrys
Sun Feb 09, 2020 2:38 am
Forum: Identification help
Topic: Help please!
Replies: 4
Views: 2819

Re: Help please!

This is a baby copepod. It's called a nauplius larva; the three pairs of appendages are ultimately going to turn into the antennae and mandibles, with the rest of the head and body appearing in later moults.
by actinophrys
Sun Jan 26, 2020 6:58 pm
Forum: Pictures and Videos
Topic: Unknown creature again
Replies: 4
Views: 1116

Re: Unknown creature again

They're not as evident here as in some, but at times like 1:22 you can see the action of the jaws in the throat, which are distinctive to rotifers and their immediate relatives. There are a lot of soft-bodied types with this basic form. This one is nicely identified by the peculiar spine between its...
by actinophrys
Sat Jan 25, 2020 5:04 pm
Forum: Pictures and Videos
Topic: Stentor or vorticella?
Replies: 6
Views: 1562

Re: Stentor or vorticella?

As everyone said, this is very much a Stentor . Besides the shape, your video gives a good look at how the actual cilia work – there is a series of membranelles that spiral clockwise into the mouth, plus rows of uniform cilia over the rest of the cell. Peritrichs like Vorticella have a few turns of ...
by actinophrys
Thu Jan 16, 2020 3:26 am
Forum: Specimens, samples and slides
Topic: Spirilium shaped bacteria.
Replies: 3
Views: 2070

Re: Spirilium shaped bacteria.

I am far from an expert, but for what it is worth, I've seen plentiful spirilla in standing puddles over old grass. The Prokaryotes notes at least Spirillum and Aquaspirillum as most common in various stagnant habitats, including hay infusions, so those should be a better place to start. They also n...
by actinophrys
Wed Jan 08, 2020 7:27 pm
Forum: Pictures and Videos
Topic: Please Identify for me.
Replies: 3
Views: 479

Re: Please Identify for me.

Like janvangastel says, this is a rotifer, and in particular one of the bdelloids – the two ciliated 'wheels' that sweep food into the mouth are very characteristic. You can also see this one has two red spots on the neck, which are simple eyes; I think it is likely a Philodina but don't know enough...
by actinophrys
Mon Dec 16, 2019 7:10 pm
Forum: Pictures and Videos
Topic: Hypotrich Dividing
Replies: 2
Views: 696

Re: Paramecium Dividing

Long but that's what it takes to show the process; good on you to follow it the whole way. For the record, this is not Paramecium but a hypotrich (the same group as Stylonychia , Oxytricha , Urostyla , and many others). You can most prominently see the oral membranelles at the front end, and then af...
by actinophrys
Fri Nov 29, 2019 6:20 pm
Forum: Beginner's corner
Topic: thinking out loud here - moral thoughts
Replies: 21
Views: 4006

Re: thinking out loud here - moral thoughts

Some time ago there was a news story where someone had built a sling to help their sick goldfish recover. Some people I talked to thought that was delightful; others (all ones I know in person, mind, not online randoms) would scoff and point out how the resources could have been used for more import...
by actinophrys
Sat Oct 26, 2019 9:02 pm
Forum: Beginner's corner
Topic: microbe ID
Replies: 1
Views: 2213

Re: microbe ID

It is not very much to go on – there are not many things that can be identified without an image or even knowing the shape. If they are indeed running , that is to say crawling quickly along surfaces rather than just swimming about, you might compare hypotrich ciliates ( e.g. Oxytricha , Tachysoma ,...
by actinophrys
Fri Oct 18, 2019 2:14 am
Forum: Identification help
Topic: Headbanging, many legs
Replies: 4
Views: 2421

Re: Headbanging, many legs

To narrow it down more, this is the oligochaete Chaetogaster, which are distinctive in only having hook-like ventral setae. The mouth and head look normal enough to me, but note they are actually the end that points down in the video, not the one you zoom in on.
by actinophrys
Tue Oct 08, 2019 10:04 pm
Forum: Pictures and Videos
Topic: Three Ciliates
Replies: 12
Views: 2419

Re: Three Ciliates

Just for the record, my understanding is that Synhymeniida were moved out of Nassophorea based on RNA trees like in Gong et al. , 2009 . But they note that Nassulopsis are different from the others in having polykinetids, and Sola et al. thought they actually belong with the Nassulida. Lynn left the...
by actinophrys
Tue Oct 08, 2019 6:11 pm
Forum: Pictures and Videos
Topic: Three Ciliates
Replies: 12
Views: 2419

Re: Three Ciliates

Bruce generally knows more about ciliate taxonomy than I do, but that seems peculiar for Nassulopsis . The figures I have seen are typically relatively slender, with multiple contractile vacuoles along the side, which even though this is a good video are not evident to me here. What keeps this from ...
by actinophrys
Mon Aug 12, 2019 2:51 am
Forum: Beginner's corner
Topic: minimizing harm
Replies: 61
Views: 28544

Re: minimizing harm

It's interesting how people here are concerned about not harming creatures that they observe. I've never heard scientists mention this. Well, here you are: “You should sacrifice bugs only if you have a scientific reason for doing so.” –Thomas Eisner, called the father of chemical ecology, et al. Co...
by actinophrys
Sat Aug 10, 2019 5:29 pm
Forum: Pictures and Videos
Topic: Rotifer in capsule
Replies: 2
Views: 733

Re: Rotifer in capsule

It looks like an egg; compare for instance some photos of a Lecane egg at plingfactory. I'm not certain but it it's already chewing, it might be mostly developed and getting ready to hatch out.
by actinophrys
Sat Aug 10, 2019 5:26 pm
Forum: Pictures and Videos
Topic: Mastigamoeba Aspera video in DIC
Replies: 9
Views: 1625

Re: Mastigamoeba Aspera video in DIC

Agreed, very nice. Especially in the close-ups you can see the close association of the flagellum/cilium and nucleus, which is characteristic for the genus. There are definitely some bacteria swimming around, but I'm not sure that they have anything to do with the Mastigamoeba.
by actinophrys
Fri Aug 09, 2019 6:20 am
Forum: Identification help
Topic: Help with two idents
Replies: 7
Views: 2551

Re: Help with two idents

The first one is definitely a ciliate. It's not a Paramecium , which have a prominent oral groove, but I'm not sure I can make out a mouth well enough to guess what it is instead. Note that while it might be less natural looking, often brightfield gives you better detail for recognizing them. The se...
by actinophrys
Sat Aug 03, 2019 6:02 pm
Forum: Pictures and Videos
Topic: Prorocentrum lima (Dinoflagellata)
Replies: 6
Views: 2327

Re: Prorocentrum lima (Dinoflagellata)

Very nice detail on the cell surface. You don't suppose the filament is a diatom? Not that it changes much, but while most chlorophyll c-containing algae get their golden colour from fucoxanthin, Prorocentrum and other dinoflagellates typically have their own unique carotenoid peridinin. The excepti...
by actinophrys
Mon Jul 29, 2019 11:03 pm
Forum: Identification help
Topic: Which rotifer?
Replies: 2
Views: 3037

Re: Which rotifer?

The spine-like toe on a short base marks this as a Lecane, which include former Monostyla, and the separation along the side of the lorica is also typical. Different species have either one or two toes. They do get confused with Lepadella a lot on-line, so good you noticed the difference!
by actinophrys
Mon Jul 29, 2019 10:56 pm
Forum: Beginner's corner
Topic: minimizing harm
Replies: 61
Views: 28544

Re: minimizing harm

Nonetheless, I see these creatures as other beings and if I am going to continue with this I want to make sure that I minimize the harm. I am using slides that have indents, rinsing and returning samples to where I obtained them and using an LED illumination source. Any other advice or comments reg...
by actinophrys
Mon Jun 17, 2019 4:06 pm
Forum: Pictures and Videos
Topic: Actinosphaerium dividing
Replies: 4
Views: 1309

Re: Actinosphaerium dividing

This looks like Actinosphaerium 's little cousin Actinophrys . They don't conjugate; they actually have an odd sexual process where one divides within a cyst and then fuses back together again, called autogamy, shuffling genes without the reproduction part. But they do often capture food as small gr...
by actinophrys
Sun Jun 02, 2019 4:35 am
Forum: Pictures and Videos
Topic: My first diatom stack
Replies: 14
Views: 2790

Re: My first diatom stack

Very nice, Wes. For the record, this looks like some type of Amphora, which characteristically have lunate valves tilted to the same side of the cell; the empty band in the middle is the girdle.
by actinophrys
Thu Mar 21, 2019 2:23 pm
Forum: Identification help
Topic: Another Aquarium Something
Replies: 7
Views: 2569

Re: Another Aquarium Something

These are definitely mites, though presumably not dust mites in particular. Identification of different types is not as easy; you could for instance compare this key. In any case mites are not unusual in aquarium samples, especially around plants or algae, which provide both shelter and food.
by actinophrys
Sun Mar 03, 2019 5:04 pm
Forum: Pictures and Videos
Topic: Pregnant Tardigrade?
Replies: 7
Views: 2535

Re: Pregnant Tardigrade?

Neat find. As 75RR's link says, many tardigrades lay their eggs inside a moult; that's what you have here. The little stub appendages confirm it came from a tardigrade, but the reason the interior is so empty is that the mother is not here. There are only the five new ones she has left behind.
by actinophrys
Mon Feb 25, 2019 2:04 am
Forum: Pictures and Videos
Topic: Oligochaete worm
Replies: 4
Views: 1762

Re: Oligochaete worm

This looks like a Chaetogaster to me. They have hook-like ventral setae, but are missing the dorsal setae typical of other little oligochaetes.
by actinophrys
Sun Feb 24, 2019 6:05 am
Forum: Pictures and Videos
Topic: Sun Animalcule
Replies: 4
Views: 1620

Re: Sun Animalcule

How large was this? Since it does not seem to have a distinct layer of ectoplasm, just the one bulging water expulsion vesicle, I think this is likely to be Actinosphaerium 's little cousin Actinophrys . The latter are mostly 30-100 µm, not counting the axopodia, and the former usually at least twic...