A new all-female scorpion and the first probable case of arrhenotoky in scorpions

A new parthenogenetic species of scorpion, Ananteris coineaui Lourenco, is reported from French Guyana. Parthenogenesis is based on the production of an all-female brood (thelytoky) by a wild virgin female. Conversely, the fi rst probable case of male parthenogenesis (arrehnotoky) in scorpions is rep orted based on the production of two successive all-male broods by a wild c aught virgin female of Tityus metuendus Pocock from Peru. Both species were found in isolated palm trees within the rain forest, conforming with the i nsular theory of parthenogenesis.