According to Richard Ellis' "The Search For The Giant Squid":


"The cuttlefishes and squids have two additional tentacles they can shoot out to capture prey....which classifies them as decapods."

Ellis may be no Ick-Theologian, but on the basis of this book and "Men And Whales", I'll take his word on sea creatures for gospel.
And he's written for AUDUBON, so he's familliar with the German Highway System, as well.....

And the term "Squids" IS acceptable for describing a grouping of species. In everyday language and usages,"Squid" is used for
both singular and plural.