Reproductive isolation from a cross between a horse and a donkey or between a mare and a donkey, respectively. These animals are nearly always sterile due to the difference in the number of chromosomes between the two parent species. Both horses and donkeys belong to the genus "Equus", but "Equus caballus" has 64 chromosomes, while "Equus asinus" only has 62. A cross will produce offspring (mule or hinny) with 63 chromosomes, that will not form pairs, which means that they do not divide in a balanced manner during meiosis. In the wild, the horses and donkeys ignore each other and do not
Selenogyrus africanus Andrew Smith claimed that "Selenogyrus africanus" "is in urgent need of redescription". Selenogyrus africanus Selenogyrus africanus is a species of tarantula, which is native to the Ivory Coast and is a member of the Selenogyrinae subfamily. Female "Selenogyrus africanus" have procurved foveae, and many spines on the labium. The cephalothorax is 12mm long and 9.4mm wide. It has some long, thick greyish-yellow hairs. The abdomen is 15mm long and 10mm wide. It is black, with long grey hairs. "Selenogyrus africanus" was originally described as "Hapalopus africanus" by Eugène Simon in 1889, but Reginald Innes Pocock, in 1897, recognized that it