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tish biologist Arthur Loveridge described a new subspecies D. jamesoni kaimosae, from a specimen collected from the Kaimosi Forest in western Kenya, observing that it had fewer subcaudal scales and a black (rather than green) tail. Analysis of the components of the venom of all mambas places Jameson's mamba as sister species to the western green mamba (Dendroaspis viridis), as shown in the cladogram below. ? ? ? king cobra (Ophiophagus hannah) ? ? ? ? ? ? Jameson's mamba – western subspecies (Dendroaspis j. jamesoni) ? ? Jameson's mamba – eastern subspecies (Dendroaspis j. kaimosae) ? ? ? western green mamba (Dendroaspis viridis) ? ? ? ? eastern green mamba (Dendroaspis angusticeps) ? ? black mamba (Dendroaspis polylepis) ? ? ? ? Description Jameson's mamba is a long and slender snake with smooth scales and a tail which typically accounts for 20 to 25% of its total length. The total length (including tail) of an adult snake is approximately 1.5–2.2 m (4 ft 11 in–7 ft 3 in). It may grow as large as 2.64 m (8 ft 8 in). The general consensus is that the sexes are of similar sizes, although fieldwork in southeastern Nigeria found that males were significantly larger than females. Adults tend to be dull green across the back, blending to pale green towards the underbelly with scales generally edged with black. The neck, throat and underparts are typically cream or yellowish in colour. Jameson's mamba has a narrow and elongated head containing small eyes and round pupils. Like the western green mamba, the neck may be flattened. The subspecies D. jamesoni kaimosae, which is found in the eastern part of the species' range, features a black tail, while central and western examples typically have a pale green or yellow tail. The thin fangs are attached to the upper jaw and have a furrow running down their anterior su