http://www.revogamers.net/noticias/nintendo-3ds/seis-estudios-espanoles-se-vuelcan-nintendo-3ds-6670.html

Abylight
(Fish’em All, Stop Stress and Neves Plus for WiiWare plus Dairojo! Samurai Defenders or Elite Forces: Unit 77 and 8 more DSiWare Games): Working on two unannounced game for Nintendo 3DS.

EnjoyUp
(Chronos Twin, Football Up and Zombie BBQ): Football Up (also known as EnjoyUp Football) is being ported to Nintendo 3DS. More info

Over the Top
(NyxQuest: Kindred Spirits): unannounced platform game, early stage of development. Rob Álvarez de Lara: “We think this new system will let us show new ways of gameplay and experiences”.

Akaoni Studio
(Zombie Panic in Wonderland): one game in development for Nintendo 3DS, related to Zombie Panic in Wonderland.

Shanblue Interactive
(Magic Destiny and Vampire’s Crystals): Announced a 3DS version of Vampire’s Crystals, thanks to their own Blue-X Engine.

Delirium Studios
(Kinito Ninja): Delirium announce "Los Delirios de von Sottendorff y su mente cuadriculada", winner of the 2010 Best Basque Game Award. It is an action adventure game mixed with many puzzles similar to the Continuity flash game. Players control a crazy 'Baron' as he revisits his palace to find why he is crazy.

Extra: Ubisoft Barcelona (thanks JEMC)
Possibly working on a game using the adapted 3DS Unreal Engine. Link

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That interesting puzzle-platformer from Delirium Studios is also showing up on Wii after the summer :)

Six game studios in Spain? Impossible!

You can also add the studio Ubisoft has in Barcelona which may be working on something using an adapted Unreal Engine. source (in spanish)

Oh, and you have one name wrong, it's Delirium Studios, not Delirium Games, see their website: www.deliriumstudios.com

Seven!?! Thanks for the tips and heads up. Missed the Studios even though it was correct on the youtube video... aish Revogamers

Been thinking which is the most famous Spanish developer? Pyro Studios?

Or Mercury Steam.