Bats of Southern and Central Africa. Ara Monadjem

SPECIES ACCOUNTS

      This section contains species accounts for 125 species of bats known to occur in the southern African region, accompanied by identification matrices, distribution maps, spectrograms (also called sonograms), photographs of bats and their skulls, and tables of measurements.

      Rather than using dichotomous keys, which can be misleading, especially when characters are missing, we provide identification matrices throughout, providing important characters for all species. Table 4 presents an identification matrix for distinguishing between the 11 families of bats found in southern Africa.

      The families are arranged phylogenetically within the two orders Pteropodiformes and Vespertilioniformes. Each family account starts with a general description of the family and genera, followed by one or more identification matrices to the genera and species. Within each identification matrix, taxa are arranged according to ascending size (FA length). Species accounts are arranged alphabetically within each family. Each species account covers the following aspects.

      Name: Scientific and common names are given (following Simmons 2005, except as stated), together with the author and date of description of each genus and species.

      Conservation status: Global Red List categories appear after the name in each account. These are sourced from the 2017 IUCN Red List of Threatened Species (www.iucnredlist.org); the original ratings were based on mutual consensus among bat biologists at the January 2004 Global Mammal Assessment meeting in London.

      Description: External, cranial and dental characters are described. Where known, the dental formula of each species is presented as follows: 2132/2133 = 34, where the numbers before the slash refer to the teeth in half of the upper jaw and the ones after it to half the teeth in the lower jaw. In this example, the species has four upper incisors, two canines, six premolars and four molars in the upper jaw – a total of 34 teeth. Figure 40 illustrates the dental and osteological features referred to in this book.

Figure 40. (a) Dorsal, (b) ventral, and (c) lateral views of the skull, and (d) lateral view of the mandible of a typical bat showing the osteological features that are referred to in this book. Grid squares represent 2 mm × 2 mm in all skull and mandible photographs, except where a note in the caption states otherwise.

      Key identification features: Diagnostic species characteristics useful for identification are provided, as well as comparisons between closely related species that may be easily confused. These features are also summarised in the relevant identification matrices provided for each family and genus. In some cases, diagnostic traits are visible from the species photographs and skull photographs (dorsal, ventral and lateral views of the cranium and lateral view of the mandible).

      Echolocation call: We provide spectrograms and call parameters of time-expanded or full spectrum (.WAV) calls for at least 60 species for which we have data, because these have been shown to be superior to those obtained with zero-crossing using the ANABAT system (Fenton et al. 2001). Nevertheless, given the large user base of bat workers using the ANABAT system, we provide relevant species call parameters for 29 species in Table 3. For more information, see Echolocation.

      Distribution, habitat and roosting: We plotted the provenance of all known museum specimens as locality records. We also included photographic distribution records for a small number of easily identifiable species, for example, Taphozous mauritianus and Eidolon helvum. Where possible, we have given the museum accession number for the type specimen of each species, and have stated in which museum the specimen is deposited.

      The distribution maps in the first edition included the predicted potential distribution of each species in southern Africa based on MaxEnt models (Elith et al. 2006). Because these models obscured the actual distribution points, and some political boundaries, we have removed them in this edition.

      Figure 41. Anatomy of a typical bat.

      Figure 42. Measurements used in bat identification: Fa forearm length; Tib tibia length; Ear length of ear from notch to tip; Trag length of tragus in the ear; 3 met length of metacarpal in the third finger of the wing; 5 met length of metacarpal in the fifth finger of the wing; Tail tail length from tip to anus; HB head and body length from nose tip to anus; Foot hindfoot length, heel to toe tips, excluding claws; P1 length of first phalanx of the third finger of the wing; P2 length of second phalanx of the third finger of the wing; P3 length of third phalanx of the third finger of the wing.

      TABLE 4.

      TABLE 4. IDENTIFICATION MATRIX FOR SOUTHERN AFRICAN CHIROPTERAN FAMILIES

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FAMILY	FACE	EYES	NOSELEAF	EARS
Pteropodidae	dog-like	large	absent	simple, edge forming an unbroken ring
Rhinolophidae	not dog-like	tiny	complex – pointed tip	large – triangular
Hipposideridae	not dog-like	tiny	complex – half-moon shape; sella and connecting process absent	large – triangular
Rhinonycteridae	not dog-like	tiny	complex – tridentate (three-pronged)	large – triangular
Megadermatidae	not dog-like	large	enveloped by pointed spike	very long, rabbit-like
Nycteridae	not dog-like	tiny	vertical slit in face, covering noseleaf beneath	very long, rabbit-like
Emballonuridae	not dog-like	large	absent	intermediate length
Molossidae	not dog-like	small	absent	intermediate to large, co-joined
Vespertilionidae	not dog-like	small