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Clarke(attributive); used in taxonomic names for organisms that often have English names of the form "Clarke's ..."
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A number of rare larger mammals are also found: dibatag (Ammodorcas clarkei, VU), Soemmerrings gazelle (Gazella soemmerringii, VU), Salts dikdik (Madoqua saltiana) and Speke's gazelle (Gazella spekei, VU).
Of the five endemic amphibians two are tree frogs (Afrixalus clarkei and Afrixalus enseticola), two are ranid frogs (Phrynobatrachus bottegi and Phrynobatrachus sciangallarum), and one is a caecilian (Sylvacaecilia grandisonae).
The Horn of Africa is a notable center of endemism for mammals, particularly for antelopes such as the dibatag (Ammodorcas clarkei, VU), beira (Dorcatragus megalotis, VU), hirola (Damaliscus hunteri, CR) and Speke's gazelle (Gazella spekei, VU).
The dibitag (Ammodorcas clarkei, VU) is found only in Somalia and eastern Ethiopia.
The resulting biota contains many arid-adapted species, including a rich large mammal fauna with species such as the dibitag (Ammodorcas clarkei), beira (Dorcatragus megalotis), African wild ass (Equus africanus somaliensis), and hirola (Damaliscus hunteri).
The most notable endemics are several antelope species, including the beira (Dorcatragus megalotis, VU), dibatag (Ammodorcas clarkei), Speke’s gazelle (Gazella spekei) and silver dikdik (Madoqua piacentinii, VU).