Dear colleagues,
I need your help with identification of this freshwater invertebrate (ectoparasite?). A total body length about 200-320 µm only. Thank you in advance for any suggestions.
Regards,
Jiri
I think it could some of Bdelloidea.
http://en.wikipedia.org/wiki/Bdelloidea
Thank you all for your responses. However, there is no visible ciliated corona on "head part". As is my knowledge, it suggests, that this specimen is not related with rotifers.
Mea culpa, it is sessile rotifer Bdelloidea. You were right. Thank you for your advice :)
Hello Jiri, I agree with the identifications provided. Best wishes, Julian Reynolds
Hello Jiri. Surely these are the rotifers, I have seen similar on the narrow-clawed crayfish eggs originating from the ponds of muddy bottom. According to my observations they are not parasites but can probably damage the casing of eggs at a higher density. Best r Darek
Hello Darek, could you direct me to some publications focusing mentioned rotifers on A. leptodactylus? Thank you very much. Regards, Jiri
The ciliated corona of rotifers like this are best observed with differential interference contrast (DIC, or Nomarski) optics. Phase contrast is also good. There are many examples of ectocommensal relationships with crustaceans, molluscs, turtles, and other freshwater fauna.
Dear colleagues,
Despite all aforementioned suggestions, this creature is definitely not a rotifer, because we did not found any hard structures. Moreover, no cilia are around the mouth, because the mouth is on the opposite side, than I thought (near the "fork"). The creature is inchworm-like moving and has two probably photosensitive eyes on the "head part". The body is not segmented and contains a large amount of fat particles... I have no idea what it could be. Any suggestions?
Thank you in advance,
Jiri
Although I cannot see the micrographs very well and do not have my literature available where I am staying, I advise you to find some literature on the neorhabdocoels, a group of small flatworms found in freshwater bodies in Europe and elsewhere. They can usually be identified with suitable literature.
I have a good knowledge of rotifers so I agree with you, Jiri, it is definitely not a rotifer.
Charles Heckman is right. It is a flatworm (Rhabdocoela) from the familly Scutariellidae. Look for pictures and texts dealing with the genus Caridinicola sp. on internet.
Fred
Hello Charles and Frédéric,
Thank you very much, your determination is right on target!
Best regards,
Jiri
Hmm ... Your description seems to be different than what I see on the photos.
...no cilia are around the mouth, because the mouth is on the opposite side, than I thought (near the "fork"). The creature is inchworm-like moving and has two probably photosensitive eyes on the "head part". The body is not segmented and contains a large amount of fat particles...
Look at the photo number 3. I can see clearly three body segments of rotifer with cilia around the mouth (on the right). On all the photos i see cilia around the mouth. Or I have hallucinations :)
I think that the video would dispel doubts as to whether it is or not rotifer.
Hello Darek,
There is a sucker disc on the right side of the photo no. 3, the mouth is on the opposite side. If you check "Caridinicola" on internet, you will see that the determination of Fred is correct. Moreover, a mastax absents in this creature.
Regards,
Jiri
Dear Colleague,
I think this is a kind of leech. Read the article : Y Munshi , Ara I, M Rafique Ahmad Z. Leeching in the history - the review .. Pakistan Journal of Biological Sciences 2008; 11 (13): 1650-3
Dear Jiri,
for my opinion (i agree with Jose), Annelida and Clitellata, Hirudinoidea, suppose that stage of development of Branchiobdellida (cannot see rings on your photo good, but this group normally small amount), that are parasitic on freshwater crayfish and shrimps. This branch lay closer to oligohaets...
Andrey
Dear Jose and Andrey,
Thank you for your suggestion, but the animal was identified as Caridinicola sp. (as I wrote above).
Regards,
Jiri
Dear colleagues,
The mentioned Caridinicola sp. together with some rotifers and protozoans was identified as "hitchhiker" associated with freshwater shrimps. These animals are imported in large numbers from Indonesia to Europe via the pet trade. For details see the attached link.
Jiri
Article Aquarium hitchhikers: attached commensals imported with fres...
Dear Jiří,
Except Fig. 2 (Scutariella sp.), all figures presents Monodiscus sp.
Most likely Scutariella japonica and Monodiscus kumaki.
Please check new article from today:
Article Epibiont Cohabitation in Freshwater Shrimp Neocaridina david...
Rafal
Sorry, there is one Scutariella in the last figure - the biggest one.
Hi Rafał,
Are you sure? If yes, we can prepare an update of the paper: Aquarium hitchhikers: attached commensals imported with freshwater shrimps via the pet trade. As the most optimistic scenario, we can add more data on tiny symbionts transported via the pet trade. If this idea grabs you, let's start the personal communication via email.
Thanks and stay safe,
Jiri
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