It is a small bat with a nose-leaf.The nose-leaf has four small leaflets, two to either side.Its fur is brown, soft, and dense.Its ears are relatively short.Its patagia are blackish-brown.Its forearm is approximately 56.1 mm (2.21 in) long, and its hind foot is 9.3 mm (0.37 in) long.Its tail is 34.6–38.7 mm (1.36–1.52 in) long.While many bats in the genus Hipposideros are similar in appearance, it can be differentiated by several characteristics: a forearm longer than 55 mm (2.2 in); large mastoid breadth; and small, gracile molars.It detects prey using echolocation, calling at maximum frequencies of 119 kHz, with a range of 118–120 kHz.
It has only been recorded on Mount Nimba, which is situated on the border of Côte d'Ivoire, Guinea and Liberia.This mountain range is notable for its bat diversity; its bat diversity is possibly the greatest of the entire continent of Africa.All captures of this species have been limited to the Guinean side of the mountain, however.It has been recorded in two sites on Mount Nimba: one a lowland tropical rainforest, the other an afromontane savanna.It has been recorded at elevations of 500–1,400 m (1,600–4,600 ft) above sea level.Four mine adits currently in use for roosts are greater than 1,200 m (3,900 ft) above sea level, however, while there is only one record of this species from a lower altitude. These more recent records suggest that it prefers the afromontane savanna, only occasionally traveling to the lowland rainforests.
During the day, it roosts in caves or mine shafts.It is known to share roosts with other species of bat, including Noack's roundleaf bat and the Angolan rousette.Based on its small teeth and relatively slender skull, it is thought that they might prey on soft-bodied insects.The examination of a small colony in December found no juveniles and no pregnant females, meaning that reproduction occurs at another time in the year.Little else is known about their reproduction.
It is listed as a critically endangered species by the IUCN, as of 2020.It meets the criteria for this designation because its extent of occurrence is likely less than 100 km2 (39 sq mi), its area of occupancy is likely less than 10 km2 (3.9 sq mi), and all individuals live in a single location.Its population is thought to be in decline.It was first evaluated by the IUCN in 1996, when it was listed as data deficient; it has been listed as critically endangered since 2004.Threats to this species include mining for iron ore, which can disturb or destroy their roosts.As of 2013, however, there were indications that mining would soon begin at the only sites where this species exists, posing an imminent threat to its existence.Its range is also subject to habitat destruction via deforestation.In this region, bats are also used as a food source, so this bat is likely killed for bushmeat.At least some of its range is encompassed by Mount Nimba Strict Nature Reserve, which confers some protections, though these protections may not be strictly enforced.Due to its imperiled status, it is identified by the Alliance for Zero Extinction as a species in danger of imminent extinction. In 2013, Bat Conservation International listed this species as one of the 35 species of its worldwide priority list of conservation.The Lamotte's roundleaf bat was specifically named in an article that argued against collecting zoological specimens from critically endangered bat species, or at least promoted more restrictions on who could collect specimens and how many individuals they could collect.
