Ossancora, new genus of thorny catfish

[brofro]

Birindelli, J.L.O. & M.H. Sabaj Pérez. 2011 Ossancora, new genus of thorny catfish (Teleostei: Siluriformes: Doradidae) with description of one new species. Proceedings of the Academy of Natural Sciences of Philadelphia 161: 117-152.

Abstract.
Ossancora, new genus, is diagnosed within Doradidae by having the unique combination of posterior coracoid process approximately as long as posterior cleithral process in adults, posterior cranial fontanel occluded, long maxillary barbel with smooth elongate fimbriae, and teeth present on dentary and premaxilla. A similarly long posterior coracoid process is found in only one other doradid species, Trachydoras paraguayensis, which is distinguished, as are its congeners, from Ossancora by having a small posterior cranial fontanel retained in adults, a relatively short maxillary barbel with stout fimbriae, and edentulous jaws. Three nominal species are recognized as valid and redescribed in Ossancora: Doras punctatus Kner 1853, in both the Amazonas and Paraná-Paraguay basins, Oxydoras eigenmanni Boulenger 1895, in the Paraguay basin, and Doras fimbriatus Kner 1855 in the Amazonas basin. The younger name Doras fimbriatus Kner 1855 is considered valid as a nomen protectum according to Article 23.9 of the ICZN, and its older synonym, D. loricatus Kner 1853 qualifies as a nomen oblitum. A fourth new species, Ossancora asterophysa, is described and diagnosed in part by a gas bladder morphology that is distinctive among congeners. Three species, O. eigenmanni, O. fimbriata and O. asterophysa, form a monophyletic group based on three shared characteristics: smooth elongate fimbriae inserted in more than one row, one dorsally and one ventrally, along anterior margin of maxillary barbel (uniquely derived among Doradidae), elongate fimbriae on mental barbels, and anterior nuchal plate reduced, not sutured to epioccipital (latter two features uniquely derived among Ossancora). Ossancora is typical of lowland floodplain lakes and river channels, and its occurrence in the both the Amazonas and Paraná-Paraguay supports a historical link between these two basins. A key to species and detailed anatomical descriptions are provided. Type specimens are discussed and lectotypes are newly designated for Oxydoras eigenmanni Boulenger 1895, D. fimbriatus Kner 1855, and Doras (Corydoras) punctatus Kner 1853, respectively.

[Jools]

Very interesting, are you able to share a PDF?

Jools

[The.Dark.One]

Now we know why Mark was referring to them as 'Doras' species, he knew they needed a new genus.

I'm assuming Doras punctatus now becomes Ossancora punctata?

[Suckermouth]

I'm assuming Doras punctatus now becomes Ossancora punctata?

Correct.

[The.Dark.One]

Thanks

[The.Dark.One]

The senior author's name should be Birindelli, not Brindelli.

[MatsP]

The senior author's name should be Birindelli, not Brindelli.

I spotted that too (but I wasn't 100% sure, so I thought "I'd better check that", and promptly forgot to do that). I've edited the original post now... The paper itself is correct in this aspect.

--
Mats

[Bathycetopsis]

Full PDF of this paper is here:
http://silurus.acnatsci.org/ACSI/partic ... jPerez.pdf

[sidguppy]

impressive!

and now the old riddle of the fish known in the hobby as "Opsodoras stubeli" has been solved as well; that particular fish is Ossancora eigenmanni.

easy to separate from the old "Doras punctatus" by possessing not only downward pointing fimbriata, but also upward pointing fimbriata on the largest whiskers.

[Yann]

impressive!

and now the old riddle of the fish known in the hobby as "Opsodoras stubeli" has been solved as well; that particular fish is Ossancora eigenmanni.

I have seen Ossancora punctata as well under such name
Cheers
Yann

[sidguppy]

yup, but the puctata and the eigenmanni are quite distinct.

they can and do appear mixed in shipments, if you're lucky