Micronycteris matses, Simmons, Voss & Fleck, 2002

Don E. Wilson & Russell A. Mittermeier, 2019, Phyllostomidae, Handbook of the Mammals of the World – Volume 9 Bats, Barcelona: Lynx Edicions, pp. 444-583 : 493

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Micronycteris matses


11. View Plate 35: Phyllostomidae

Matses Big-eared Bat

Micronycteris matses

French: Micronyctere des Matses / German: Matses-Grof3ohrblattnase / Spanish: Micronicterio de Matses

Taxonomy. Micronycteris matses Simmons, Voss & Fleck, 2002 ,

“Nuevo San Juan,” Loreto, Peru.

This species is monotypic.

Distribution. Known only from two localities in Loreto Department, NE Peru (Nuevo San Juan and Sierra del Divisor); it might be widely distributed in Amazon Basin. View Figure

Descriptive notes. Head—body 50-55 mm, tail 13-17 mm, ear 21-5-23 mm, hindfoot 11-12 mm, forearm 37-5-39-5 mm; weight 8-6-14 g. Greatest lengths of skulls are 20-20-9 mm. Matses Big-eared Bat is medium-sized, with dark brown dorsal and ventral fur. Dorsal hairs are bicolored, with white bases and brown tips. White hair bases in upper back are no more than one-quarter the length of hairs;this is different from the other species of Micronycteris where white bases are one-quarter to one-half the lengths of hairs. Hairs in shoulder region are 7-8 mm long. Ears are large and rounded, connected by transverse low band that extends across crown of head, with shallow notch or slit in center of band, similar to all other dark-bellied congeners. Hairs on outside of medial one-third of pinna are less than or equal to 3 mm and dense. Calcar is longer than foot. As other species of Micronycteris, Matses Big-eared Bat has relatively long rostrum, large braincase, and shallow basisphenoid pits. Mastoid breadth is less than zygomatic breadth. P? and P* are subequalin length (anteroposterior dimension), and height of P° is equal to or slightly less than that of P*. Lower incisors are small and bilobed, not hypsodontas they are in Hairy Big-eared Bat. Sizes of lower premolars have a consistent pattern: P, is smaller in anteroposterior length and dorso-ventral height than P, and P,, and P, is larger than P; this characteristic resembles that of Hairy Bigeared Bat ( M. hirsuta ).

Habitat. [Lowland primary rainforests (two locations). Village of Nuevo San Juan at an elevation of 150 m (type locality) is surrounded by well-drained primary forest, except for small gaps caused by windfalls and active and abandoned agricultural plots. Rainy season extends from late December through mid-April; dry season is not exceptionally dry, with July and August as the driest months. Second locality at an elevation of 170 m is the protected area known as Zona Reservada Sierra del Divisor, which is primary forest with several types of vegetation cover.

Food and Feeding. No information.

Breeding. No information.

Activity patterns. Matses Big-eared Bat is nocturnal. It roosts in any dark hole in the ground covered by soil and roots, including animal-made burrows or subterranean cavities possibly from erosion.

Movements, Home range and Social organization. Matses Big-eared Bats have been found in deep burrows that were probably excavated and enlarged by the Great Longnosed Armadillo ( Dasypus kappleri ), and they share these roosts with Pale-winged Doglike Bats ( Peropteryx pallidoptera ) and Silky Short-tailed Bats ( Carollia brevicaudum ). Other species of Micronycteris are more commonly encountered by searching for diurnal roosts, mostly rotted cavities in logs or standing trees, than by standard mist netting, which could be similar for Matses Big-eared Bats and thus reflect their small numbers in faunal inventories.

Status and Conservation. Classified as Data Deficient on The IUCN Red List.

Bibliography. Fleck & Harder (2000), Larsen et al. (2011), Lim et al. (2010), Medina et al. (2015), Porter et al. (2007), Simmonsetal. (2002), Voss et al. (2016).














Micronycteris matses

Don E. Wilson & Russell A. Mittermeier 2019

Micronycteris matses

Simmons, Voss & Fleck 2002