The Loyalty Bent-winged Bat is known from Lifou and Maré in New Caledonia. Its 2020 IUCN assessment listed seven known cave roosts.
Head-body length is 44–46 mm in males and 43–49 mm in females. Forearm length is about 39.5–40.5 mm in males and 39–42.2 mm in females.
It roosts in cave colonies. Some mixed colonies included three Miniopterus species; the reported 1,000–1,500 bats are the combined total, not this species alone. Pregnant females were caught in October 2001.
In 2001, it was also captured in Wanalu and Cila forests on Lifou.
Ear length is reported as 11.5–12.2 mm in males and 12–13 mm in females.
An extinction-risk assessment has not been added yet.