Check it out on The World Register of Marine Speices:

http://www.marinespecies.org/aphia.php?p=taxdetails&id=148969

It says that Biddulphia is no longer an accepted name and that Odontella should be used. This implies that Biddulphia is the basionym for Odontella.

Dear Karnan:

Odontella is a genus belonging to the Triceratiaceae and Biddulphia is a genus belonging to the Biddulphiaceae. Triceratiaceae has ocellate elevations and Biddulphiaceae has pseudo-ocellate elevations.

You can read about them in Round et al. (1990).

Kind regards.

Eugenia

Dear Karnan:

The genus Biddulphia is still accepted, and it is not a synonym of Odontella. Many species of the genus Biddulphia were transferred to the genus Odontella because of the ocelli, but not all them. For example, the accepted name for Biddulphia mobiliensis is Odontella mobiliensis and for Biddulphia regia is Odontella regia, but Biddulphia biddulphiana is still accepted in the genus Biddulphia .

Regards,

Margarita

Dear Karman and  Margarita:

Recently Odontella mobiliensis, Odontella regia and Odontella sinensis were transferred to the new genus Trieres Ashworth & Theriot by Ashworth et al. (2014), see below.

ASHWORTH M.P., NAKOV T. & THERIOT E.C. 2013. Revisiting Ross & Sims (1971): toward a molecular phylogeny of the Bidulphiaceae and Eupodiscaceae (Bacillariophyceae). Journal of Phycology 49 (6): 1207-1222.

In the references of this paper you can found a lot of papers that you can consult for understand the problema.

Regads.

Eugenia

Dear Karnan,

I agree with Margarita, that the two genera are accepted name but some references refer to limited species as follows:

According to  Checklist of Baltic Sea Phytoplankton Species by Guy Hällfors, 2004 :

Biddulphia Gray 1821

          obtusa (Kützing) Ralfs in Pritchard 1861 l − − − − − − − − −

           [Odontella obtusa Kützing 1844]

            [Biddulphia aurita v. obtusa (Kützing) Hustedt 1930]

and also:

1. http://aplx5.rdg.ac.uk/annual-checklist/2009/show_species_details.php?record_id=31346&showlsid=urn:lsid:catalogueoflife.org:taxon:d765e65c-29c1-102b-9a4a-00304854f820:ac2009.

2. Species Checked: verified by a taxonomic editorOdontella antediluviana (Ehrenberg) M. Peragallo, 1903 accepted as Checked: verified by a taxonomic editorBiddulphia antediluviana (Ehrenberg) Van Heurck, 1885.

Only one reference refer to  Trieres as Eugenia mentioned according to ASHWORTH et al. 2013,     "that there are monophyletic genera within both the Biddulphiaceae and Eupodiscaceae, and recommend the taxa within the Odontella mobilensis/sinensis/regia clade be transferred to a new genus: Trieres Ashworth & Theriot."

Regards

Fikrat

Dear all:

The correct name of the species mentioned by Frikrat is Odontella obtusa Kützing or considering the point of view of Hustedt Odontella aurita var. obtusa (Kützing) Hustedt. I am working with this species from Argentinian coastal waters and discussing it with Odontella aurita (Lyngbye) Agardh. This species presents ocellate elevations, not pseudocellate elevations as Biddulphia species.

The correct name of the second species that you mentioned is Amphitetras antediluviana Ehrenberg, as all can note there is a long and difficult taxonomic and nomenclatural history in the members of Triceratiaceae and Eupodiscaceae.

As you can note the genus Trieres was recently erected, thus there are no other authors that consider this group of species in the new genus. In my opinion this taxon is clearly sustaining.

Regards.

Eugenia

Dear Eugenia,

Thank you for your explanation, but kindly do you read any other paper confirm the new specie (Trieres) as you know the confirmation of new species is important.

Regards

Fikrat

Dear Frikrat:

I  understand your point of view, when you are determining species you can consider necessary to find more than an author for deciding if you the new genus. I am working with genus Odontella s. l. for Argentinian coastal waters and in my oppinion Trieste is a genus with a clear circunscription.

Kind regards.

Eugenia

Dear Eugenia,

 Thank you so much for your kind answer.

Dear all:

We recently published our paper about Odontella, Trieres and Zygoceros.

I think that it can help.

Kind regards.

Eugenia

Check it out on algaebase...

It is extremely useful to follow

All best