It is a large oyster valve, Ostrea sp.

Hi Árpád Dávid,

Thank you so much for your answer.

Why you choose Ostrea sp but not Gryphaea sp?

Best, 

Hakima

Hi Hakima,

Because, according to my knowledge, based on examination several hundred fossil oyster valves, the specimen you displayed here is a remain of a bivalve belonging into the genus Ostrea.

By the way! Could you drop some sentences about the age and the locality, please?

Best wishes,

David

Hi Árpád Dávid,

Until now, i don't have any information about the age and the locality perhaps in the future, however i will tell you.

Cordially,

Hakima

Hakima:

It is Ostrea sp. and not Gryphaea because the Umbo is not so distinctly curved as in Gryphaea.

Best

Syed.

Syed Abbas Jafar :

Thank you so much for your confirmation.

Cordially,

Hakima

Such type of  genus has been recorded by Chiplonkar from Narmada Basin, Central India

He recorded as Curvostrea, Isostrea

Susheel:

Till Hakima furnishes age and locality of the specimens, it is advisable to have a look at this link for detailed insights about the related taxa.

http://www.durban.gov.za/City_Services/ParksRecreation/museums/nsm/Documents/Cretaceous%20oysters%20of%20SE%20Africa.pdf

Best

Syed

Susheel,

Thank you so much for your proposition to nominate this fossil.

I don't agree with you it couldn't be Curvostrea, Isostrea. Because the umbo is not so curved than Curvostrea.

Syed, 

Thank you so much for the link it is very interrested.

According to my colleague, the locality of this specimen is morocco and the age is after than upper Cretaceous.

Best,

Hakima

It is Ostrea sp. and not Gryphaea

Dear Paul,

Thank you so much for your answer. 

Ragards,

Hakima

salut Hakima

Bien sur c'est pas une Gryphea qui possède une crocher recourbé...ce Huître est très proche de  l'espèce Crassostrea gryphoides (Schlotheim, 1813)  qu'on trouve dans le miocène.

Bonsoir monsieur Masrour,

Merci beaucoup pour votre réponse et pour les informations supplémentaires. Maintenant je suis convaincu qu'il ne s'agit pas d'une Gryphea Sp. A votre avis, pourquoi c'est du Crassostrea gryphoides et non pas Ostrea Sp?

Mme. Yakoubi a opté pour Ostrea Sp, elle a confirmé que l'age peut être le miocène et son origine est le Maroc.

Cordialement,

Hakima

Hakima:

Would you please provide translation of your last answer. Thanks.

Best

Syed

yes it looks like gryphaea

Dear Hakima,

The anatomy and morphology of this species indicate: Crassostrea gigas (Thunberg, 1793). For more details, I invite you to visit this website: http://www.marinespecies.org/photogallery.php?album=700&pic=66400

Best regards,

Amor DEGAICHIA

Syed,

This is the translation for my last answer:

{Hi M. Masrour,

Thank you so much for your response and for all information.

Now, i'm convinced that the specimen is not Gryphea Sp. But why you said that is Crassostrea gryphoides and not Ostrea Sp? because he propose in his answer that the specimen is Crassostrea gryphoides (Schlotheim, 1813)

Mme. Yakoubi (my colleague) confirm Ostrea Sp and she said that the age should be the Miocen and its locallity is Morocco.

Cordially,

Hakima}

Dear Amor,

Thank you so much for your answer and the link.

You and M. Masrour identify this specimen as like Crassostrea, but why not Ostrea Sp?

Best,

Hakima

Dear Som,

Thank you so much for your answer.

If this specimen is Gryphaea Sp; why the Umbo is not so distinctly curved as in Gryphaea?

Best,

Hakima

Dear Hakima,

Ostrea Sp. is not a precise nomenclature because when the gender is know but that the species is not determined, it is customary to use as temporary epithet of the Latin species "sp." following the name of the genre. The genus Crassostrea belongs to the family Ostreidae.

Best regards,

Amor DEGAICHIA

Dear Amor,

Thank you so much for your detailed answer.

The family of this specimen is Ostreidae and the genus is Crassostrea but the species is not determined.

Kind regards,

Hakima

Dear Hakima,

You’re welcome. In my first post, I told you that his anatomy and morphology suggest to us the following determination: Crassostrea gigas (Species) (Thunberg, 1793).

For more details, I invite you to consult this very interesting website: http://www.marinespecies.org/aphia.php?p=taxdetails&id=140656

Best regards,

Amor DEGAICHIA

Hakima:

You need to consult this link for proper insights, Crassostrea gigas is a large species among other features:

https://www.nobanis.org/globalassets/speciesinfo/c/crassostrea-gigas/crassostrea-gigas.pdf

Best

Syed

Hakima:

Based on a single detached valve it is unwise to debate on the taxonomic status of this Oyster, which is not Gryphaea - an answer to your question. Now, your material is of Miocene age and comes from Morocco, further discussions should focus on fossil material and in-depth analysis and study of published records, including the one cited in this link:

http://www.worldoyster.org/proceeding_pdf/news_18-1e.pdf

Best

Syed

Hakima:

In case you want to go in for further studies of this oysters, you may like to have a look at this link, which explains the relative thickness of the shell as well planned strategy:

http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=9783437&fileId=S0094837300021680

Best

Syed

Dear Syed, dear Amor

Thank you so much for all suggestion, advice and for the links. It was very interesting.

Best regards,

Hakima

Señora  Hakima Belkhattab:

El ejemplar fotografiado corresponde a la especie Crassostrea gryphoides (Schlothrim, 1813)

Señor Joaquín,

You guess like nomination of this specimen Crassostrea gryphoides according to (Schlothrim, 1813). And the material is of the Miocene age.

Many thanks for your time and inerest!

Best,

Hakima

Hakima:

You need to measure the features of the inside of the shell you documented, as suggested by Urs. The link provided by Urs is critical and important for confirmation of Crassostrea gryphoides.

Best

Syed

Urs,

Thank you so much for your time and interest. The attached files is very interesting to determine exactly this species. 

As Syed said, I will measure the features of the inside of the shell and tell you all the result to discus the confirmation.

Best,

Hakima

Hakima:

Before you attempt to measure the features of  inside of the Shell, you need to get rid of filling sediment to see the shape, size and position of muscle scar. You can clean the shell by putting it under H2O2 solution in a Ultrasonic and thereafter gently remove the sediments by a needle.

In case you need a translation of German text of Urs, do let me know.

Best

Syed

Syed,

I think that the fossil is already cleaned by H2O2 solution. So i think measure the features of inside of the Shell and tell you all about the result.

For the German text of Urs, i will use mostly the charts and photos from the article, and using Google traduction to understand some German word. As i do with some English word, because my first foreign language is French and the second is English. So if you can translate only the measurement methodology , I will be grateful.

Many thanks for your help and interest.

Best,

Hakima

Hakima:

Refer to Fig. 1 cited by Urs:

LH= Ligament height

LB= Ligament width

R= Residing space?

lw= Left Pad

rw= Right Pad

ME= Muscle Scar

Best

Syed

Syed,

Thank you so much for the translation of all abbreviation which i need, it was very nice of you.

Urs,

Thank you so much for the link and for the file attached, it was very kind of you.

In the attached file tow pictures with some measure. What do you think about?

Best,

Hakima

Urs and Hakima:

The shape, size and position of Muscle Scar cannot be ascertained as it is covered with sediment debris, making fool proof identification almost impossible.

Best

Syed

Urs,

Thank you so much for the attached file "Crassostrea gryphoides_measure".

Urs and Syed,

I will use the H2O2 for removing the sediment from the inside to reveal the position of the Muscle Scar.And let you know.

Regards,

Hakima