L-355 "Ancistrus sp."..a Chaetostoma?

[Jools]

I am OK with moving the above fish to Chaetostoma, though I have a nagging feeling it might be one of the closely related genera, like Dolichancistrus or Leptoancistrus. However, despite an hour's worth of work I can not key it out. Too many of these genera require a sexually mature male to key out.

Yeah, I laboured over that too (

Dolichancistrus

). But nothing matches so it's "go with

Chaetostoma

" for now. Will send you the DATZ on L402.

Jools

[gaballench]

If you have some good pics I can take a look. There are several characteristics that separate Chaetostoma from Ancistrus aside from tentacles. You can count caudal peduncle plate rows (3 in Ancistrus, 5 in Chaetostoma); presence of fleshy ornamentation on premaxillae-dentaries (present in Chaetostoma, absent in Ancistrus); interorbital distance (large in Ancistrus, short in Chaetostoma); and cheek odontode shape (either straight or strongly recurved in Chaetostoma, straight and just distally recurved in Ancistrus).

Hope this helps.

Cheers,

Gustavo

[MatsP]

Gustavo, welcome to Planet Catfish (although I did see that you've been a member for some time).

The pictures of the fish in question are available on the new page that I created today:

Chaetostoma sp(5)

.

--
Mats

[Shane]

You can count caudal peduncle plate rows (3 in Ancistrus, 5 in Chaetostoma)

Gustavo,
This is the characteristic I tried to focus on without luck. Maybe you can see it better. I am on a Kindle Fire.
-Shane

[gaballench]

Hello guys,

Sorry to be SO late, but I definitely visit planet catfish way eventually. Nevertheless, take a look at the ventral pic showing the mouth. This specimen clearly shows tentacles, so it's Ancistrus. In addition, from the lateral pic I see it shows three caudal-peduncle plate series, so, again, it's Ancistrus.

Best wishes,

Gustavo

[Jools]

Hi Gustavo,

As it's been a year (nice yo have you back on here!) this has all been moved around since the origial posts above. I will move this topic to resolved...

Jools