Fish in a nodule needs ID

[KOI]

Hi All,

I bought a fossil fish on online a while ago. The seller identified it as

"PTERONISCULUS Fish fossil Trias 250 mio Madagascar"

It would be nice to confirm and also get additional information on possible locality, ideally reference to a scientific publication.

I'm really curious about in situ conditions where the fossil was found. Could it be desert, or a mine. It seems like the fish nodules are not that rare if you look on-line but it's hard to find anything about the place of origin.

Clearly, recognizing a fish species in this condition is a rare skill. So, many thanks in advance to those who will weigh in and share an opinion and information.

Pictures are attached.

[Pemphix]

See here: