Quagga
A zeuglodont is a member of the Zeuglodontidae family, an extinct family of cetaceans.
The horse is a member of the Eqqus family, along with zebras and many other horse-like animals.
The Tiger.
A palaeomerycid is a member of the Palaeomerycidae, an extinct family of ruminants.
An anacoracid is a member of the Anacoracidae, an extinct family of sharks.
An anthaspidellid is a member of the Anthaspidellidae, an extinct family of sponges.
pony
A xiphiid is a creature, a member of the Xiphiidae family, of whom the only non-extinct member is the swordfish.
Yes it is, as it is an Equine, just like a horse.
It is a Zebra.
A palorchestid is a member of the Palorchestidae, an extinct family of miocenes which lived in Australia.
Zebras Zebras