385.

Findley’s Myotis

Myotis findleyi

French: Murin de Findley / German: Findley-Mausohr / Spanish: Ratonero de Findley

Taxonomy. Myotis findleyi Bogan, 1978,

“ Nayarit: Islas Tres Marias, Isla Tres Magdalena,” Mexico.

Subgenus Pyzonix; lucifugus species group. Monotypic.

Distribution. Endemic to Mexico, restricted to Marias Is (Madre, Magdalena, and Cleofas), off Nayarit.

Descriptive notes. Head-body c.44 47 mm, tail 26-33 mm, ear 11-13 mm, hindfoot 6-7 mm, forearm 29-5-33- 2 mm; weight 2-3 g. Findley’s Myotis is morphologically similar to its Neotropical congeners. Fur is moderately long (dorsal 7-8 mm; ventral 5-6 mm) and silky. Dorsum ranges from medium brown to blackish brown, although some individuals are nearly bufty; dorsal hairs are bicolored, with dark brown or blackish basal two-thirds and pale brown to pale, appearing frosted, tips. Ventral hairs are bicolored, with blackish bases and generally buffy tips. Ears are comparatively short, extending forward halfway from eye to nostril. Tragus averages 5- 5 mm and narrows subapically to a point. Membranes are mummy brown; plagiopatagium is broadly attached to foot at bases oftoes; keel is never strongly developed and variable in size. Fringe of hairs along trailing edge of uropatagium is absent; upper and lower surfaces of uropatagium are barely covered with hairs. Skull is small in size (greatest skull lengths 11-9-12- 8 mm); rostrum is narrow; forehead (in profile) has abruptrise from rostrum to frontals; braincase is globose,rising slightly from forehead to occiput; sagittal crestis generally absent or, when present, very low; and lambdoidal crests are present and very low. P? and P* aresituated well within tooth row; P? rarely contacts P*; anteroposterior length of M3 is reduced, causing it to appear narrow laterally; and protocone on M' and M? is weakly developed, and protoconule relatively is well developed.

Habitat. Tropical deciduous forests near water bodies from sea level up to elevations of ¢. 600 m.

Food and Feeding. Findley’s Myotis is an aerial insectivore that forages over water bod-16S.

Breeding. Breeding season of Findley’s Myotis apparently begins in April.

Activity patterns. No information.

Movements, Home range and Social organization. No information.

Status and Conservation. Classified as Endangered on The IUCN Red List. All Findley’s Myotis occur in fewer than five locations. Threats include urban development, livestock, wood harvest, and introduction of non-native species.

Bibliography. Arroyo-Cabrales & Ospina-Garces (2016c), Bogan (1978), Wilson (2014a).