It can be found in the Waikato, Taupō, Hawke's Bay and Rangitīkei regions This species was first described by George William Gibbs in 2019.

[1] It is very similar in appearance to M. vulcanica and can only be reliably distinguished from that species through dissection of genitalia.

[1] The male genitalia of this species is diagnostic as it is sickle-shaped with periphallic arms.

[1] M. falcata is endemic to New Zealand and can be found in the Waikato, Taupo, Hawke's Bay and Rangitīkei regions.

[2][1] This species lives in damp mountain forests made up of rimu, beech and Libocedrus bidwillii.