Eumops nanus (G. S. Miller, 1900)

Don E. Wilson & Russell A. Mittermeier, 2019, Molossidae, Handbook of the Mammals of the World – Volume 9 Bats, Barcelona: Lynx Edicions, pp. 598-672 : 632-633

36.

Northern Dwarf Bonneted Bat

Eumops nanus

French: Eumope nain / German: Kleine Bulldogfledermaus / Spanish: Eumops nano

Other common names: Dwarf Bonneted Bat

Taxonomy. Promops nanus G. S. Miller, 1900 ,

“Bogava [= Bugaba District], Chiriqui [Province], Panama (alt. 250 m.).”

Eumops nanus was previously considered a subspecies of E. bonariensis based on morphological and molecular differences.

Monotypic.

Distribution. Patchily from S Mexico (Veracruz and Oaxaca) SE through Central America to extreme N Colombia, NW Venezuela, S Guyana, and Peru; also on Cozumel 1.

Descriptive notes. Head—body 49-68 mm, tail 28-47 mm, ear 12-19 mm, hindfoot 6-11 mm, forearm 39-48 mm; weight 7-13 g. See general characteristics of the genus under the Black Bonneted Bat ( E. auripendulus ). The Northern Dwarf Bonneted Bat is the smallest species of Eumopsin overall size. Dorsal furis grayish brown to dark brown, with c. 5mm long hairs being whitish at bases. Ventral fur is slightly paler and frosted on tips. Lips are wrinkled but less than in Wagner’s Bonneted Bat ( E. glaucinus ). Ears extendjust beyond nose tip when laid forward. Wing attaches near end of tibia. Upper incisors converge to each other and are not in contact with canines.

Habitat. [Lowland tropical humid forests, thorn forests, and secondary forests.

Food and Feeding. Stomach contents of Northern Dwarf Bonneted Bats from Mexico contained 55% moths, 27% beetles, and 15% bugs (by volume).

Breeding. In Mexico, Northern Dwarf Bonneted Bats were pregnant from late March to late June, with parturition occurring in midto late June. Lactating females were reported from early June to late July, with lactation lasting up to two months. Reproductively inactive females occurred in March-April, June-July, and September-—November. Subadults were found in October. Males had enlarged and secreting throat glands in May-June.

Activity patterns. Primary activity of Northern Dwarf Bonneted Bats occurs during first two hours after sunset, with secondary activity before sunrise. They roost in tree holes and under roof tiles of houses in colonies of ¢.20 individuals in Mexico. These bats fly near water bodies, including human-made ponds and swimming pools.

Movements, Home range and Social organization. No information.

Status and Conservation. Classified as [Least Concern on The IUCN Red Lust.

Bibliography. Bowles et al. (1990), Eger (2008), Handley (1976), Hutterer et al. (1995), Miller (1900a), Reid (1997), Torres-Morales et al. (2014).

Figures

22. Big Crested Mastiff Bat (Promops centralis), 23. Davison’s Mastiff Bat (Promops davisoni), 24. Brown Mastiff Bat (Promops nasutus), 25. Black Bonneted Bat (Eumops auripendulus), 26. Common Dwarf Bonneted Bat (Eumops bonariensis), 27. Chimera’s Bonneted Bat (Fumops chimaera), 28. Chiribaya’s Bonneted Bat (Eumops chiribaya), 29. Big Bonneted Bat (Eumops dabbener), 30. Delta Bonneted Bat (Eumops delticus), 31. Fierce Bonneted Bat (Fumops ferox), 32. Florida Bonneted Bat (FEumops floridanus), 33. Wagner's Bonneted Bat (Fumops glaucinus), 34. Sanborn’s Bonneted Bat (Eumops hansae), 35. Guianan Bonneted Bat (Eumops maurus), 36. Northern Dwarf Bonneted Bat (Fumops nanus), 37. Patagonian Dwarf Bonneted Bat (Eumops patagonicus), 38. Western Bonneted Bat (Eumops perotis), 39. Trumbull’s Bonneted Bat (Eumops trumbulli), 40. Underwood’s Bonneted Bat (Eumops underwoodi), 41. Wilson’s Bonneted Bat (Eumops wilsoni)

Distribution. Patchily from S Mexico (Veracruz and Oaxaca) SE through Central America to extreme N Colombia , NW Venezuela , S Guyana , and Peru ; also on Cozumel 1.