The table below lists extant species:[4]
| Scientific name | Authority | Distribution |
| A. aroana |
H.B. Baker 1930 |
|
| A. carinata |
Dunker 1858 |
Widespread distribution from Guyana west to the Magdalena River, Colombia |
| A. colombiensis |
Marshall 1922 |
Known from the Colorado River and adjacent streams in northern Colombia |
| A. crispata |
Bruguière 1792 |
Widespread in tropical South America, north of the Paraná Basin |
| A. cylindracea |
Lea 1838 |
Chiapas and Veracruz, Mexico |
| A. depexus |
Martens 1900 |
Guatemala |
| A. elongata |
Swainson 1823 |
Amazon Basin in Brazil, Peru and Colombia; the Magdalena River in Colombia; and the upper Paraguay in the Paraná Basin |
| A. ferrarisii |
d'Orbigny 1835 |
Lower Paraná system |
| A. guanarensis |
Marshall 1927 |
Venezuela |
| A. iheringi |
Clessin 1882 |
Paraná and adjacent coastal streams in Brazil |
| A. inaequivalva |
Lea 1868 |
Lake Nicaragua |
| A. infossus |
H.B. Baker 1930 |
Northern Venezuela |
| A. leotaudi |
Guppy 1866 |
Venezuela and Trinidad |
| A. lucida |
d'Orbigny 1835 |
Paraná and adjacent coastal streams in Brazil, Uruguay and Argentina |
| A. moricandii |
Lea 1860 |
Lower São Francisco and Atlantic streams as far south as Rio de Janeiro, Brazil |
| A. obtusa |
Spix & Wagner 1827 |
Disjunct distribution in the Tapajos River in the Amazon Basin, the São Francisco River and adjacent coastal streams, and the Piracicaba in the upper Paraná basin |
| A. patagonica |
Lamarck 1819 |
Widespread in the Paraná and adjacent coastal basins. |
| A. pittieri |
Marshall 1922 |
Venezuela |
| A. schomburgianus |
Sowerby 1870 |
Described from British Guyana |
| A. solenidea |
Sowerby 1867 |
From the São Francisco south to the Paraná in Brazil, Paraguay, and Argentina |
| A. tehuantepecensis |
Crosse & Fischer 1893 |
Mexico and Central America |
| A. tenebricosa |
Lea 1834 |
Widespread upper Amazon, coastal streams of southern Brazil and the Paraná Basin, South America |
| A. tortilis |
Lea 1852 |
Guyanas, Venezuela and Colombia, north to Costa Rica |
| A. trapesialis |
Lamarck 1819 |
Widespread in South America from the Paraná System through the Amazon Basin and northern drainages, and north to Mexico |
| A. trapezea |
Spix & Wagner 1827 |
Paraná and Rio São Francisco basins, west to the upper Amazon |
| A. trigona |
Spix & Wagner 1827 |
|
Four species are known from fossils (three exclusively so):[1]
