As far as I know, no Pygidicraninae has ever been reported for Réunion
On iNaturalist, 2 specimens of Dacnodes (?) sp. have been found
The next species is Dacnodes malgassica from Madagascar, in Steinmanns books, only females were known, who are also apterous
So it could be D. malgassica, which is further distributed or an endemic island species?

https://www.inaturalist.org/observations/266733217
https://www.inaturalist.org/observations/266733214

permico wrote on iNat:
It is Nesolabia longicollis certainly, it has Pygidicranid-like appearance, it is endemic for Reunion

online sources:
https://inpn.mnhn.fr/espece/cd_nom/714866
https://www.insecte.org/forum/viewtopic.php?t=85172
https://www.galerie-insecte.org/galerie/ref-76707.htm

It is Nesolabia longicollis certainly, it has Pygidicranid-like appearance, it is endemic for Reunion

Steinmann (1990) mentions it as in a doubtful position without description, Steinmann (1986) also mentions it, for Mauritius and Réunion.

By the habitus I would expect the genus to belong to Pygidicraninae instead of Geracinae, so I will move the thread to a discussion about taxonnomic issues instead of discussions about new species

Probably genital examination, molecular barcoding and morphological examination of specimens could help here

Danilo also mentioned Blandicinae - Parablandex from Madagascar could also be related - externally Dacnodes is a less good match than Cranopygia or Parablandex probably...