Hi!
In Spain "langostinos" are king prawns, "gambas" are prawns, "camarones" are shrimps and "quisquillas" are small "camarones" although many people don't make any difference betwen quisquilla and camarón.
All of them are different species, they are not the same specie in different sizes although they look the same one.
Here is a list with the commercial names for all fisheries in Spain published by the Spanish Governement this year. You can look here for their scientific names (nombre científico).
Denominaciones pesqueras comerciales La tortillita de camarones is a very tipical Andalusian dish incredibly delicious when it is fresh and well prepared. :hdspin:
recipe tortillitas de camarones recipe with photos In American Spanish they only have the word camarón for all those species.
In Argentina where gamba means human leg, it's a word borrowed from Italian language because of the large number of Italian inmigrants that the country received in the past.