New Brachyrhamdia

[Silurus]

Slobodian, V & FA Bockmann, 2013. A new Brachyrhamdia (Siluriformes: Heptapteridae) from Rio Japurá basin, Brazil, with comments on its phylogenetic affinities, biogeography and mimicry in the genus. Zootaxa 3717: 1–22.

Abstract

Brachyrhamdia thayeria is herein described as a new heptapterid species from Rio Japurá, a left margin tributary of the Rio Solimões, Amazonas basin, Brazil. The new species is diagnosed from all its congeners by having a putative autapomorphy: dark oblique stripe across the caudal peduncle, originating below the anterior half of adipose fin and ending at base of rays of ventral caudal-fin lobe. Brachyrhamdia thayeria is considered closely related to B. imitator and B. rambarrani with which it shares a low vertebral number and absence of lateral stripe along trunk. The new species shares exclusively with B. rambarrani the presence of a dark conspicuous bar along the dorsolateral region of trunk, a putative synapomorphy. Brachyrhamdia are distributed in lowland regions of northern South America where they inhabit small streams with running waters. The new species appears to have a mimetic association with the syntopic callichthyid Corydoras arcuatus. Herein, we argue in favor of the hypothesis that the interaction between species of Brachyrhamdia and Pimelodella or Corydoras is Müllerian mimicry.

[Silurus]

This is probably

Brachyrhamdia sp(1)

. Will confirm later today.

[Silurus]

The new species is indeed Brachyrhmadia sp(1). I have added some Cat-eLog data, except for the species name (which I cannot change).

[Shovelnose]

A copy if possible HH.


Thanks,

[kruseman]

Herein, we argue in favor of the hypothesis that the interaction between species of Brachyrhamdia and Pimelodella or Corydoras is Müllerian mimicry.

Pretty interesting stuff but:I don't really understand why. Can somebody here expand on this?

[Silurus]

In Batesian mimicry, the mimic is harmless, while the model is harmful (venomous or poisonous), while in Müllerian mimicry, two or more harmful species share a similar color pattern to act as a warning signal for a set of common predators.

[Jools]

A copy please? Meantime, I've changed the name...

Thanks!

Jools

[kruseman]

I would like to have a copy too.
Thanks,
Arjan

[Coryman]

I would appreciate a copy as well please.

Ian

[Richard B]

Me too please