[restalis]

"to Thai, squid, octopus, and cuttlefish are all ปลาหมึก. For English speakers, those are similar things, but all clearly distinct. But for Thai speakers, they're all ปลาหมึก, just different types."

Then, ปลาหมึก = coleoidea? If so, the squid, octopus, and cuttlefish are (in English and many other languages) all just types of coleoidea: https://en.wikipedia.org/wiki/Coleoidea

[cwnyth]

Coleoidea is a technical word, though, and ปลาหมึก isn't. Ordinary people use ปลาหมึก to refer to all of them, but they might not use that same word to describe e.g. nautiloids. It doesn't map neatly on our technical language.