What are these

[rufioman]

Those are some awesome tetras!! Great find!

 

[Tifftastic]

I looked this up and got a hit on Google Scholar. So, it looks like they may be correctly labelled but the reason that you are seeing variation from the Google images pictures is that there is in fact variation in wild populations. Each different population along the river basin has a variation on not only coloration, but shape of the fins.

Here's an excerpt that is publicly available:

Analysis of morphometric and meristic data from specimens obtained from various river basins along the distribution of Nematocharax venustus revealed intraspecific variation among geographically isolated populations. A comparative analysis of these data with data from the original description of N. costai, in addition to data obtained from the holotype and topotypes of the species, showed broad overlap and absence of morphological features supporting the recognition of two species within Nematocharax. Characters previously used to distinguish N. costai from N. venustus, such as presence of hooks or spinules on dorsal and pelvic fins, number of hooks on anal-fin rays, occurrence of a pink horizontal mark on the caudal peduncle, number of supraneurals, and coloration of the pelvic-fin filament, are not useful to distinguish the two putative species. Thus, N. costai is considered herein as a junior synonym of N. venustus. Presence of a complete lateral line and length of fin-filaments of N. venustus are briefly discussed and a current overview of the distribution of the species is given. In view of the proposed synonymy of a so recently described species and aiming to avoid problems of similar nature in the future, we also take the opportunity to reinforce herein the importance of the examination of large population samples and of intraspecific variation of secondary sexual features

Here's the link for the abstract and figures. Check out the picture of their different specimens collected. Hope this helps!
https://www.researchgate.net/public...ki_Teleostei_Characiformes_Characidae/figures

 

[Octavarium]

Isnt it exciting that there still 10000s of aquatic animals yet to be discovered or described in taxonomy yet! Cant wait to find a characin and name it after me lol Pseudograndis DeWitti aka The Bearded Bitterfish

 

[originalhurt]

Yea I bought 8 of them the day I asked, they are doing great now not quite so skidish, tank mates are 6 glo lite tetras and 2 Bolivian rams. lighty planted tank 55 gallon, fluval 306 and bio wheel 150 for filtration.

 

[myswtsins]

Alright now you're teasing me, what kind of substrate is that?

 

[originalhurt]

Alright now you're teasing me, what kind of substrate is that?

Sand I got from petco at least 5 years ago, just black aquarium sand, I had a heater malfunction 2 years agoand lost most of the fish except the 2 glo lites and plants decayed, recently rejuvenated, nematocharax not so skidish and everyone's happy. Any idea on the type of snail? It kinda looks like a pond snail which I had in a different tank years ago, and it overtook quickly. This snail came in with a plant and has been a loner for almost 7 weeks.