remy_dubas's Identifications

Caught in the wild and photographed nearby in an aquarium. Bell is 20–25 mm tall.
Note tall, conical aspect of the bell and the gonad extends from nearly the top of the manubrium to the mouth (just a very short section at the top of the long manubrium is without gonad).

Hyperiid amphipods (Amphipoda, Hyperiidea) of the world's oceans: By M.E. Vinogradov, A.F. Volkov and T.N. Semenora, Science Publishers, USA, 1996, 632 pp.

P. 428 Fig. 186. Phronimella elongata (Claus)

https://library.si.edu/digital-library/book/hyperiidamphipod00vino

I got called to help out to search for a dead Angelshark so that environmental agents could collect it.
We found it pretty fast.
It looks like it got stabbed by a knife, sadly enough.

After that, we went for more snorkeling around and there was a lot of plankton life around.