Horse outward similarity is an unreliable measure of relatedness. Besides the horse, there are six other species of genus "Equus" in the Equidae family. These are the ass or donkey, "Equus asinus"; the mountain zebra, "Equus zebra"; plains zebra, "Equus quagga"; Grévy's zebra, "Equus grevyi"; the kiang, "Equus kiang"; and the onager, "Equus hemionus". Horses can crossbreed with other members of their genus. The most common hybrid is the mule, a cross between a "jack" (male donkey) and a mare. A related hybrid, a hinny, is a cross between a stallion and a jenny (female donkey). Other hybrids include the zorse,
Selenogyrus africanus 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 had all the characteristics of "Selenogyrus" and placed it in that genus.