Xiphophorus continens

Xiphophorus continens, also known as El Quince swordtail or short-sword platyfish, is a live-bearing freshwater fish in the family Poeciliidae. It is endemic to the Pánuco River basin in east-central Mexico. Its name comes from the Greek conto, meaning short, and Latin ensis, meaning "sword". due to the species' sword size in males.

Description
X. continens reaches up to 3.5 cm in total length. It is a small, slender species, with a slender caudal peduncle and with a midlateral stripe. The maximum length of the sword is 1 mm. It has a hook on its gonopodium; distal serrae; its grave spot, when present, is only visible under 10X magnification; no xanthophore or pterinophore pigment patterns.

Distribution
Headwaters of the Rio Ojo Frio, north of Damian Carmona, Pánuco River drainage, San Luis Potosí.