Why Do Planarians Have Those Triangles on their Heads?

From Journey to the Microcosmos.

Flatworms are kind of adorable. And they have keep scientists up at night for a few reasons.

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SOURCES:
https://ucmp.berkeley.edu/platyhelminthes/platyhelminthes.html
https://www.frontiersin.org/articles/10.3389/fnmol.2022.935918
https://www.pnas.org/doi/full/10.1073/pnas.1332513100
https://doi.org/10.1186/s40851-014-0010-z
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8662385/
https://archives.collections.ed.ac.uk/repositories/2/resources/87219
https://archive.org/details/b21946668/page/32/mode/2up