The Phallostethus Cuulong is a diminutive species of freshwater fish discovered in 2009. Also, it is one of the only twenty-two species of what are known as priapium fish.
The discovery of this fish happened in the tidal canals of the Mekong Delta, in Vietnam. Perhaps this is the only place that the creature inhabits.
Phallostethus Cuulong Reproduction
Just as with this animal, all known species of priapium fish inhabit regions of Southeast Asia. All of these differ from other fish by the unique locations of their genitalia. While most fish species reproduce externally, the Phallostethus Cuulong, along with all priapium fish, reproduce internally.
Though not the only fish to do that, what sets this species apart from other externally reproducing fish is the location of their copulatory organs. In both genders, these sit right behind their mouths. Just take a moment to imagine if that happened in the human body.In the Phallostethus Cuulong, the location of the copulatory organs is right behind the mouth. Click To Tweet
Among other externally reproducing fish species, copulation is almost instantaneous. In the case of the Phallostethus Cuulong, however, the process takes longer due to the nature of the male’s reproductive organ. The penis includes a rod with a barbed hook. Why? Because it holds better. It just grabs onto the female during mating and does not let go.
Phallostethus Cuulong Physical Description
This is a rather small species of fish averaging roughly 1 in (2.5 cm) in length. Also, as well as interestingly, their bodies remain almost translucent in appearance. For the moment, the evolutionary reason for this still remains a mystery. We still have a lot to learn from Nature.