Tachypleus

Tachypleus is a genus of south, southeast and east Asian horseshoe crabs in the family Limulidae.

Species
There are two extant (living) species:
 * Tachypleus gigas (Müller, 1785)
 * Tachypleus tridentatus (Leach, 1819)

And two extinct species only known from fossil.
 * Tachypleus decheni (Zincken, 1862) Upper Eocene Domsen Sands, Germany
 * Tachypleus syriacus (Woodward, 1879) Upper Cretaceous (Cenomanian) Haqel and Hjoula Konservat-Lagerstatten, Lebanon