New Corydoradinae paper

[Coryman]

The long awaited phylogeny paper resurrecting genera previously in synonymy with

Corydoras

has been published.
https://academic.oup.com/zoolinnean/adv ... m=fulltext

[bekateen]

Great news! Thanks Ian!

Cheers, Eric

Angelica C Dias, Luiz F C Tencatt, Fabio F Roxo, Gabriel de Souza da Costa Silva, Sérgio A Santos, Marcelo R Britto, Martin I Taylor, Claudio Oliveira. (2024). Phylogenomic analyses in the complex Neotropical subfamily Corydoradinae (Siluriformes: Callichthyidae) with a new classification based on morphological and molecular data, Zoological Journal of the Linnean Society, zlae053.
https://doi.org/10.1093/zoolinnean/zlae053

Abstract
The family Callichthyidae, which comprises the subfamilies Corydoradinae and Callichthyinae, represents one of the largest families within the Siluriformes. Corydoradinae, the largest subfamily of Callichthyidae, alone accounts for >200 valid species, with new species being described frequently. This subfamily holds significant popularity among catfish enthusiasts worldwide, mainly because Corydoras are small, peaceful, and colourful fishes. Recognizing the existence of polyphyletic groups within Corydoradinae, the aim of this study was to construct a new phylogenetic hypothesis using genomic data (ultraconserved elements) and to re-evaluate the synonymized genera using the most recent morphological data. Our results supported the monophyly of Corydoradinae and identified seven distinct groups of species, each one with an associated pre-available generic name. These genera, namely

Corydoras

,

Aspidoras

,

Scleromystax

,

Gastrodermus

(resurrected),

Osteogaster

(resurrected),

Brochis

(resurrected), and

Hoplisoma

(resurrected), were all validated based on evidence derived from molecular and morphological analyses. A taxonomic key for the Corydoradinae genera is provided.

Keywords: biodiversity, catfish, Corydoras, taxonomy, ultraconserved element, phylogenomics, phylogeny, systematics

• The long snouted corys (lineage 1) are the only corys to retain the generic name
  Corydoras
  .
• The genera
  Aspidoras
  (lineage 2) and
  Scleromystax
  (lineage 3) remain unchanged.
• The dwarf corys like
  Corydoras pygmaeus
  (lineage 4) are combined with the
  Corydoras elegans
  group (lineage 5) to form the genus
  Gastrodermus
  .
• The
  Corydoras aeneus
  group (lineage 7) is now
  Osteogaster
  .
• All corys in lineage 8 (including the
  Corydoras agassizii
  and
  Corydoras reticulatus
  subgroups) are lumped for now with existing
  Brochis
  . Maybe this will be broken up later.
• The
  Corydoras paleatus
  group (lineage 5) is combined with the short-snouted corys (lineage 9:
  Corydoras trilineatus
  ,
  Corydoras sterbai
  , etc.) to form the genus
  Hoplisoma
  .

[Jools]

Thanks Ian and Eric for posting - especially Ian; it has been a while.

So, the million$ question for me is do I keep the lineages especially for Brochis' sub-clades.

Will consider for a day or two - not one to rush!

Cheers,

Jools

[bekateen]

Thanks Ian and Eric for posting - especially Ian; it has been a while.

So, the million$ question for me is do I keep the lineages especially for Brochis' sub-clades.

Will consider for a day or two - not one to rush!

Cheers,

Jools

Hi Jools,

I already moved the smaller groups (the aeneus group, the pygmy cory group and the Brochis subclade 1 group (Brochis sensu stricto)). I also moved the Lineage 8 subclades 2 and 3 to Brochis, because they are small subgroups.

But I did not yet move the larger groups (Corydoras Lineage 8 subclade 4, the elegans group, the paleatus group and the julii group) because (A) those are large groups that will take a while to rename and (B) I wondered if you might want to code the lineage 8 subclades as Brochis subclades: e.g., as we did with lineage 1 corys, name subclade 1 of Brochis just "Brochis", then name the other three subclades of lineage 8 as Brochis(sc1), Brochis(sc2) and Brochis(sc3).

Your thoughts?

Cheers,
Eric

[Jools]

Hi Eric,

Yes, for sure. Brochis(sc2) etc is the way to go. Brochis(sc1) doesn't need to be, just Brochis is fine for this - good call. Give it 24 hours (so, daily/overnight backups run) and then cool to rename the big groups one per 24 hours? This has been a very long time in "gestation", fine to take a day or three to make it happen?

And, one Brochis, is obviously, Brochi.

Cheers,

Jools

[bekateen]

Yes, for sure. Brochis(sc2) etc is the way to go. Brochis(sc1) doesn't need to be, just Brochis is fine for this - good call. Give it 24 hours (so, daily/overnight backups run) and then cool to rename the big groups one per 24 hours? This has been a very long time in "gestation", fine to take a day or three to make it happen?

Hi Jools,

All the lineage 8 subclades are moved to Brochis. I haven't moved the elegans group with pygmies or the paleatus group with lineage 9 fish. Should I create subclades there too? If so, the paleatus group would be "Hoplisoma(sc1)" and the pygmy corys would be "Gastrodermus(sc1)" (since the type species for

Gastrodermus

is C. elegans).

A lot of the lineage 9 fish, when moved to

Hoplisoma

, needed to have their gender changed (e.g.,

Corydoras trilineatus

becomes

Hoplisoma trilineatum

, etc). I've made all those epithet updates and reported the old names as synonyms.

Let me know if you want subclades on Hoplisoma and Gastrodermus.

Cheers, Eric

P.S. Also, the new genera will need to be assigned to the subfamily Corydoradinae. I can't make that update. Thanks.

[Jools]

I'm 50/50 on "Microcorydoras", but I think the stronger feeling is that getting rid of numbers in names is the right call (excepting, as you say, the Brochis sub-clades). Epic work on the name gender changes.

So, only Brochis remains split, everything else into their new (old) genera.

Sorry I am not helping much with this at the moment, will have much more time next week (but need to get a CSG journal out).

Cheers


Jools

[bekateen]

Okay. Will leave the other combined groups undivided as just Hoplisoma and Gastrodermus.

Cheers, Eric