genus Dicerorhinus: Processus postglenoideus and posttympanicus separated. Nasalia small, pointed in front. Genus Rhinoceros: Processus postglenoideus and posttympanicus not separated. Nasalia pointed in front. Genus Diceros: Processus postglenoideus and posttympanicus partly separated. Nasalia rounded in front.
I 1/0, C 0/1, the lateral upper and medial lower incisors are the most obvious.
Fam. Rhinocerotidae. True Rhinoceros-type animals first appear in the upper Eocene or Oligocene in Europe and North America and they reach their prime in Eurasia.
Class Rhinocerotoidea Family Rhinocerotidae 2 groups A. Rhinocerinae, all recent rhinos, derived from different ancestors B. Elasmotheriinae genera A. Dicerorhinus Gloger (sumatrensis) B. Rhinoceros s.str. (Sondaicus, unicornis) C. Diceros Gray = Atelodus Pomel (bicornis, simus)
genus Dicerorhinus: molars brachyodont, without cement. Ectoloph bend upwards with a large Parastyl.