Agassizii or Gephyra?

[Luís]

Hello people, can anyone help me to identify this little one?

 

[MacZ]

A. gephyra.

 

[dw1305]

Hi all,
Welcome.

Hello people, can anyone help me to identify this little one?

I can't help with the ID, two reasons, one because I'm poor at IDs and the other that the images are 16 mb in size and I can't download them. If you reduce their size? It would make life a lot easier.

Cheers Darrel

 

[anewbie]

A. gephyra.

Curious - i couldn't find what distinguish the two species can you provide input. I did look at tom's page and even a couple of cf species share both names.

 

[Luís]

Curious - i couldn't find what distinguish the two species can you provide input. I did look at tom's page and even a couple of cf species share both names.

I had look at tom's page too.

 

[Luís]

Hi all,
Welcome.

I can't help with the ID, two reasons, one because I'm poor at IDs and the other that the images are 16 mb in size and I can't download them. If you reduce their size? It would make life a lot easier.

Cheers Darrel

 

[Mike Wise]

There are several gephyra-like species. Without a catch location some are hard to tell from one another.

 

[anewbie]

There are several gephyra-like species. Without a catch location some are hard to tell from one another.

But how do you distinguish between gephyra and agassizii ?

 

[Mike Wise]

It's available in many books on apistos. Does anyone read books anymore?

OK, A. gephyra always displays a red/orange band along the top edge of the male's dorsal fin (some agassizii do too). The tips of the dorsal and anal fin are shorter on mature gephyra males. The ventral fin are shorter and the caudal fin is not as extended (blunter) than on agassizii. In display, the lateral band on agassizii extends from the base of the tail to the lateral spot. On gephyra it extends from the tail, past the lateral spot and on toward the operculum. There are scale counts and other physical features, too, but they are best seen on preserved specimens.

 

[Frank Hättich]

I would like to add that there are differences in the caudal pattern too: in gephyra, the submarginal band is usually much narrower than in agassizii and there is a lace-like pattern inside of it (often merely in the upper half of the caudal fin).