I found this gel like thing on a beach in Malaga. It seems like they are connected in chains, and it looks like some of them are pulsating. Could they be from a squid of some sort?
Here's a video of it pulsating
From (Spanish) Las salpas, las extrañas criaturas que llenan las playas de Málaga
estos invertebrados no tienen nada que ver con las medusas, por lo que no son urticantes, (...)
"Son el paso intermedio entre los invertebrados y los vertebrados, puesto que tienen una primitiva columna, y forman parte del plancton, la sopa marina que es la base de la cadena alimenticia en el mar", ha manifestado.
These invertebrates have nothing to do with jellyfish, so they are not stinging, (…)
“They are the intermediate step between invertebrates and vertebrates, since they have a primitive column, and they are part of plankton, the marine soup that is the base of the food chain in the sea,” he said.