Three valid Oxydoras and their differences?

Mika · Post by **Mika** » 24 Aug 2005, 06:44

There is currently three valid Oxydoras spp.
O.niger
O.sifontesi
O.kneri

What are main differences between these species? There is hardly any photos from the others than well known O.niger.
O. sifontesi

O. sifontesi

O.niger

TalenT · Post by **TalenT** » 24 Aug 2005, 19:56

What happened to the fish that used to be called Pseudodoras holdeni?

Like that third pic, in black/white it looks like it's made of stone. cool.

Post by **Silurus** » 24 Aug 2005, 20:10

holdeni is tentatively considered a synonym of niger.

coelacanth · Post by **coelacanth** » 31 Aug 2005, 12:53

Silurus wrote:holdeni is tentatively considered a synonym of niger.

In that case, and based on the images above, it would appear that we have both O. niger and O. sifontesi here at Bolton (I had though we had O. niger and O. holdeni).
The larger specimen which I believe to be O. niger has large deep lateral scutes, whereas the smaller one has much shallower scutes (I have counted the scutes of each in the past but can't remember the numbers right now) and is quite different in general appearance.
Anyone got a picture/line drawing of O. kneri for further comparison?
Pete

Post by **Silurus** » 01 Sep 2005, 14:39

Anyone got a picture/line drawing of O. kneri for further comparison?

Isn't there already one in the Cat-eLog?
I could check if there is one in Kner (1855).

coelacanth · Post by **coelacanth** » 01 Sep 2005, 20:57

So there is

, but it's the same picture listed above as O. sifontesi which is what confused me, so I don't know if Mika made a typo or whether that image has been sourced from elsewhere as O. sifontesi.
Anyway, no matter, the scute pattern on the one at work is much closer to the pictured preserved specimen labelled as O. sifontesi.
Pete

Post by **Silurus** » 01 Sep 2005, 21:10

The picture is from Fishbase, so it's a typo.