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Text and photos by Nick Baker, unless otherwise credited.
Copyright ゥ Ecology Asia 2020

 
 
     
   
   

 

   
   
 
Diadem Roundleaf Bat
   
   

Fig 1


Fig 2
 


Fig 3
 

Fig 4
 
 

 

 

 

 

 

Order : CHIROPTERA
Family : Hipposideridae
Species : Hipposideros diadema

Forearm Length : up to 8.7 cm
Weight : up to 47 grams

The Diadem Roundleaf Bat is a widespread and adaptable species, occurring in a variety of forested habitats.

This is amongst the largest of roundleaf bats in Southeast Asia, and is easily identified by the presence of well-defined white or pale orange patches of fur on the sides of its body and shoulders. The rest of the upper body fur is a rich, dark brown colour, and the face and underparts pale.

When hunting, this bat typically hangs from a perch waiting to ambush large insects, such as moths, as they fly past. Other insects consumed may include those with a thick exoskeleton such as beetles, weevils and katydids : the soft parts of such insects are consumed and the inedible parts, such as wings, carapace and legs are  discarded below the perch.

The species makes use of a variety of roosts including treeholes, caves or the shelter of large-leaved palms.  Large caves may shelter  maternity roosts numbering in their thousands.

The Diadem Roundleaf Bat occurs in Burma, Thailand, Indochina (Vietnam, Laos, Cambodia) and Peninsular Malaysia. It has never been recorded in Singapore, but occurs in Sumatra, Java, Borneo and many parts of eastern Indonesia to New Guinea. It also occurs in the Philippines and parts of the eastern Pacific (including parts of Australia). Many subspecies are recognised.


Fig 1 : A Diadem Roundleaf Bat hangs suspended from a narrow twig whilst waiting for insect prey to fly past. 

Fig 2 : Underside of the same specimen.

Fig 3 : Close-up of the noseleaf. Note the tri-lobed posterior noseleaf (the three protruding structures between and slightly above the level of the eyes) - these are a diagnostic feature of Hipposideros diadema and closely-related species.

Fig 4: Lowland, primary forest on the island of Langkawi, where these images of Hipposideros diadema were taken.

All images are from Langkawi Island, Peninsular Malaysia.


References : M4, M5