It was first scientifically described in 1801 after an 18th-century survey of Pennsylvania.
It is privately owned and has yet to be given a name or described scientifically.
It was first scientifically described as a genus in 1986.
The species was first described scientifically in 1839 by Vittadini.
This species, which only was scientifically described in 1996, is threatened by habitat loss.
The species was first scientifically described in 1937 by Laboissiere.
The species was first scientifically described by Vieillot in 1823.
It has been known to the aquarium hobby for many years, but was only described scientifically in 2008.
First described scientifically in 1998, it is known only from the eastern United States.
It was discovered in 1996 and scientifically described in 1998.
