Hello Mr. Marco Violante-Huerta,

I haven't worked with amphipods personally yet but your attached image of the species looks like to be of a Phronimid amphipod, may be Phronima itself.

Best wishes,

Dr. Abhishek Mukherjee

Phronima

It is not Phronima for sure. Due to the long pereopods it seems to be a Themisto species, but it is not possible to determine with an image. Maybe you check it with the study of

Vinogradov_etal_1996_Hyperiid-amphipods_world_oceans

Best regards

Michael

Thank you for all your kind answers, we'll do more micrographs to get a certain idetification for this amphipod

Hi Marco, I think it is Phrosina semilunata (a juvenile)

Hi Clara,

Yes, it is a juvenile of P. semilunata with some other morphological variations in the shape of uropods, telson, pleopods and pereopods 3-4.

Do you know any literature about it's development?

Thanks for your kind answer