This species lives in tree holes in mixed bamboo and disturbed evergreen forests, forest edges, and occasionally in shallow mud nests in wet grasslands and swamps (D.-q. Rao pers. comm. June 2019, Mainland Southeast Asia Assessment Workshop August 2020). Individuals have been recorded under logs and found near small forest pools (J. Rowley and G. Wogan pers. comm. August 2020). It is unknown whether their detection in disturbed habitats is due to their adaptability to disturbance, or whether it was just easier to observe them in more open habitat (J. Rowley pers. comm. August 2020). They are clumsy and can only crawl slowly, and make murmuring sounds (Fei et al. 2012). It breeds by larval development, laying their eggs in tree holes and water-filled cavities in the root systems (D.-q. Rao pers. comm. June 2019).

This species occurs in south-western Yunnan Province, China, to adjacent extreme north-western Vietnam and extreme eastern Myanmar. In Myanmar, it occurs in Northern Kachin State, and in Viet Nam it is found in Ha Giang Province (Bain and Nguyen 2004), and Tram Ton Station, Tam Duong District in Lai Chau Province (Mainland Southeast Asia Assessment Workshop August 2020). It is likely to occur in intervening Lao People's Democratic Republic. It occurs between 1,830-2,783 m asl (D.-Q. Rao pers. comm. June 2019, Fei et al. 2012, J. Rowley pers. comm. August 2020). B. fortinuptialis has tentatively been synonymized with this species, therefore records from eastern Guangxi Province that were previously assigned to B. fortinuptialis are now recognized as B. microdeladigitora (Pabijan et al. 2013). 

However, there is substantial confusion and debate surrounding the taxonomic identity of this species, B. fortinuptialis, B. maximus, and B. lichuanensis. Some consider records from Lichuan County in Hubei Province, those from eastern Guangxi Province, and those from Mabian County in Sichuan Province to represent three separate species (B. lichuanensis, B. fortinuptialis, and B. maximus, respectively; D.-Q. Rao pers. comm. June 2019). Pending additional taxonomic work, we follow Frost (2021) in recognizing B. microdeladigitora as a valid species, and B. fortinuptialis as its synonym.