[thaumasiotes]

Is it not the t̪? https://en.wikipedia.org/wiki/Dental_consonant

[DonaldPShimoda]

I think it's not perfect, because (I believe) Spanish /t/ is usually denti-alveolar and not fully dental. I don't think there's a way to express that specific aspect of it, though I'm also not a linguist so I may be mistaken!