Ammonite from Madagascar

[NIKUNIKU]

Hello.
This is the ammonite I have. Are these names Aioloceras besairiei? Are these all the same type?
Since I am Japanese, I use Google Translate to write this sentence.

Edited December 30, 2019 by NIKUNIKU
Miss

[Ludwigia]

Yes, I think that is correct.

[NIKUNIKU]

Thank you.

[FossilDAWG]

Welcome to the Fossil Forum! 

 

Yes, your ammonites are all Aioloceras besairiei (Collignon, 1949).  When Collignon originally described this species he put it in Cleoniceras, and you will generally see the name Cleoniceras besairiei used in websites and scientific papers until recently.  Kennedy and Klinger (2012) reassigned the species to Aioloceras.  Also Collignon was a notorious "splitter" who described many species from Madagascar, but Kennedy and Klinger synonymized almost all of them with Aiolocers besairiei.

 

Don

[NIKUNIKU]

40 minutes ago, FossilDAWG said:

化石フォーラムへようこそ！ 

 

はい、アンモナイトはすべてAioloceras besairiei（Collignon、1949）です。Collignonがこの種を最初に説明したとき、彼はそれをCleonicerasに入れました。一般的に、最近までWebサイトや科学論文でCleoniceras besairieiという名前が使用されていました。  Kennedy and Klinger（2012） は、種をAiolocerasに再割り当てしました。また、コリグノンはマダガスカルからの多くの種を説明した悪名高い「スプリッター」でしたが、ケネディとクリンガーはそれらのほとんどすべてをアイオロカー・ベサイリエと同義でした。

 

ドン

In fact, I have two more ammonites. These look more like Moretella than Aioloceras. Correct?

[Ludwigia]

We would need a picture of the venter in order to decide. The whorl width should be much wider than that of the Ailoceras.

[NIKUNIKU]

9 hours ago, Ludwigia said:

We would need a picture of the venter in order to decide. The whorl width should be much wider than that of the Ailoceras.

 

[Ludwigia]

2 minutes ago, NIKUNIKU said:

 

Thanks for the photo. Yes, I think that you are correct that these are Moretella.

 

[NIKUNIKU]

1 minute ago, Ludwigia said:

写真をありがとう。はい、これらはMoretellaであることは正しいと思います。

 

thank you for helping me.

[Ludwigia]

2 minutes ago, NIKUNIKU said:

thank you for helping me.

You're welcome. I didn't know that I could write Japanese

[FossilDAWG]

3 hours ago, Ludwigia said:

Thanks for the photo. Yes, I think that you are correct that these are Moretella.

 

I agree.

 

Don

[NIKUNIKU]

Just now, FossilDAWG said:

同意する。

 

ドン

Thank you.

[NIKUNIKU]

Is this Beudanticeras? Or Desmoceras?

[FossilDAWG]

Desmoceras.  Beudanticeras has a much more compressed whorl profile.

 

Don

[NIKUNIKU]

1分前、FossilDAWGは次のように述べました。

デスモセラス。Beudanticerasには、はるかに圧縮された渦巻きプロファイルがあります。

 

ドン

ありがとうございます。