Nephanes titan explained

Nephanes titan is a beetle from the Ptiliidae family of dwarf beetles. N. titan is notable for its exceptionally small body and simple nervous system. With an average maximum body length of only a few hundred micrometers, the beetle is one of the smallest non-parasitic insects in the world.^{[1] [2]}

Despite its minuscule nervous system, the beetle is still capable of associative learning.

Notes and References

1. Polilov. Alexey A.. Makarova. Anastasia A.. Kolesnikova. Uliana K.. 2018-11-30. Cognitive abilities with a tiny brain: Neuronal structures and associative learning in the minute Nephanes titan (Coleoptera: Ptiliidae). Arthropod Structure & Development. 48. 98–102. 10.1016/j.asd.2018.11.008. 30472324. 1467-8039.
2. Book: Polilov, Alexey A.. 2016. At the Size Limit - Effects of Miniaturization in Insects. en-gb. 10.1007/978-3-319-39499-2. 978-3-319-39497-8.