Do you have any pictures of the whole body? Judging from what looks like its rostrum, it is probably a species which associates with the bottom in its adult form which may help reduce the list of possibilities.

Yes Caleb. Now I have some more pictures. In minutes I will put here some of  them

Here is the whole larva

Operculum spine

Dorsal and ventral views of the snout

Interesting. Looks like what I originally thought was a broad rostrum for detecting prey in adulthood may actually be just a big mouth for feeding. Do you mind if I pass these pictures onto another researcher for his input? His name is Brian Sidlauskis and is a fish guru around Oregon State. If nothing else he may know someone else who could help.

Caleb, I would be  thankful if  you could ask to Brian.

Tanya

2.  PA (mm) =11.52

4. no spines

standard length (mm) = 12.34

These measures need to be confirmed.

Thanks

I lost the recommendations of Tanya

Myomeres:

Preanal 44

Postanal 17

Thank you

Looks like I made a flag, unintentionaly, somewhere. Maybe in Tanya messages. Please Tatyana don´t be mad with me because i never used this gate. I would be very thankful if you can put your advices again

Dear Isabel,

I sent my recommendations in the message. Check pls.

Best regards

some more to add

thank you very much

Hey Isabel,

Sorry for the delay. I've sent Brian a message with a link to this question and the conversations so far.

thank you

Isabel; This larva looks like a Paralepididae. Sudis in particular has spines on the operculum and preoperculum and is very toothy. See if that works for your specimen.

Bob Schmidt

Hey Isabel,

Brian recommended someone who is very familiar with fish larvae, so I asked him to take a look and sent him the link to this question. With any luck we can get it narrowed down even further.

Caleb.

Hi Caleb,

Thanks for including me in the identification of the larva. It is indeed a larva of the genus Sudis. The fin ray counts are too low but I believe this is based on missing some of the smaller rays in the posterior part of both fins, D and A. If the myomere count is correct, it might be the species S. hyalina. Interestingly, on one of the photos of the body, the black internal pigment fields are still visible which are characteristic for the entire order Aulopiformes. 

Best,

Peter

Thanks for your input Peter!

Dear all

I´m very thankful to all of you

Now I´m sure  it is one Paralepididae and I´m documenting the characteristics of Sudis hyalina.

As I said before, I´m not used to deep sea samples and to IKMT samples. So my difficulty.

If you do not consider abuse, maybe you could help me with other fish larvae. 

Thank you very much

Isabel

Isabel; I am happy to help. Deep sea samples are not my specialty, but I do have access to useful literature.

Thank you very much, Robert. Thar´s very kind of you

Isabel