I found this benthic fauna on mangrove sediment. But I am not sure whether it as bivalve or ostracoda. Can anyone help me with the identification.
Indeed, looks very much an ostracod. Small bivalves should show growth lines and (normally?) no pores. Also the decoration is typical for some marine ostracods.
probably unnecessary at this point, but I'd also call that an ostracod!
The ostracode had 2 closed valves; after fossilisation thos valve will be separated générally that kind is ornamented not smooth ostracod.
The upper specimen is indeterminate. The lower specimens are possibly ostracods, but more illustrations (good optical, or SEM) necessary to be certain.
Thanks everyone. I'm still wondering actually. The outer shells have pores like ostracod. (or do bivalve larvae usually have pores like that also?). But when I disarticulate the valves, the soft body part does not look like ostracod (refer to the pic). Maybe I should view using SEM or identify it using molecular technique. Later, I will update the result. Thank you everyone for the replies. :)
It is difficult to say from the images. Only a few species of bivalves have punctate surfaces, but I believe these do not show until after the protodissoconch phase. However, you mentioned that you found these in mangroves. The bivalves that I collect from the peats in south Florida frequently have very pitted and corroded surfaces due to the acidity of the peat. Perhaps that is what is giving the odd appearance to the surface. The general shape of the valves suggests these could be one of the boring bivalves - a Lithophaga mussel or something in the Pholadidae group, which would also make sense in this environment.
I have the impression that it is ostracoda. I worked on the mangrove ostracoda and i feel it is an ornamented ostrada
Dear Nor Syuhaidan Mohammad Zee Hood,
I propose first you use Ultrasonic Cleaning Method (ultrasonic bath), then SEM method can clarified whether your specimen is Ostracoda or bivalve. By controlling the arrangement of hinge or dents you can assigned your samples to ostracoda or bivales
Best wishes
I agree with Medhi., your specimens need to be cleaned before SEM examination. Cleaning may be possible under a microscope by gently stroking them under water in a petri dish with a fine camel-hair brush. If this does not remove the extraneous material, then use the ultrasonic bath method.
Work on cleaning first then proceed with identification. yeah? he
It can be a ostracode (mainly based on the second image). But you should make better photos to be sure. try to detail the hinge and muscle scars
Hi guys,
I just viewed my samples using SEM. The first pic is full view of the inner valve, second I zoomed at the hinge. Third I zoomed the outer surface shells. Do you have any idea what kind of species is this?
It is not a ostracoda. On the shell ostracods has hinge (tooth, median bar), muscle scars and eye spot.
It does't look like ostracoda according to the borders. And the size is much bigger than an usual ostracod valve.
- I agree with Viktoriia and Aihua that the specimen is unlikely to be an ostracod for the reasons that they have proposed.
This is not Ostracoda. There is not any line at the hinge line (for example unipartite, merodont, ....) , there is not any place for adductor muscle place inside the specimen. There is not any Radial pore canals on the specimen. May be this is a pieces of a seed or flora part.
Thanks for the replies Viktoriia, Yuan, Jones and Medhi. I asked ostracod and bivalve expert. They also said that it is neither ostracod nor bivalve. I have another sample. There is something on the valve. I really have no idea whether it is fauna or flora seed as Medhi thought.
Certainly not an ostracod, nor a juvenile bivalve. The SEM pictures of June 2015 are internal views of an opened seed testa. The last SEM picture of June 16 2015 shows at the uppermost part a cut through the hilum of the seed testa. The structure of the testa is quite different from the structure of ostracod or bivalve shell walls.
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This is not an ostracoda carapace
As all colleagues noted there are any structures characterizing the ostracoda carapaces
i agree with Prof. Dr. Eugen Karl Kempf , it is a seed
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