Interesting sighting & image looks good even with ISO :8000.

This could be a species from Broadhead Planarians (Genus Bipalium). Got to know about this site / app of inaturalist, who are building a global repository of all life. Interesting to browse through it. In addition to taxonomic names, they have also specified common names / family , which is easier to understand.

You may like to see through the link for above specimen as below.

https://www.inaturalist.org/taxa/64224-Bipalium

TFS

Regards/ Anil Kumar Verma