How does this small brown crescent-headed land planarian(?) "look around" and sense its envirnoment? This 2-3 cm long, thin brown worm with a wide "anchor" or hammer or crescent shaped head was seen in northern Taiwan slowly moving along a damp tile outdoor surface. It moved by contraction/extension _and regularly lifted its head_ appearing to explore its environment, as if to say "where should I go next"? Comments suggest that this is a land planarian. **Question:** Is it possible to confirm that this is a land planarian **and to understand what sensory organs it has on its head** in order to "look around" and decide where to go next? ![enter image description here]( ![enter image description here](

Given that "hammerhead worms" are Bipaliinae, I expect you can find your species from this bibliography1. _Bipalium_ or _Diversibipalium ruteofulvum_ and cosmopolitan _Bipalium kewense_ are mentioned, but I did not find images of these species online just now.

A paper about the sense organs of _B. kewense_ (Abdel-Haleem, 2014) mentions many small pigment cup eyespots, as well as papillae and pits that may be chemosensory in nature.

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1Kawakatsu et al. 2004 _An Annotated Bibliography of Taiwan Land Planarians, with Lists of Linked Papers on This Animal Group_