| Microcharacidium | |
|---|---|
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Order: | Characiformes |
| Family: | Crenuchidae |
| Genus: | Microcharacidium Buckup, 1993 |
Microcharacidium is a genus of South American darters. There are currently 3 recognized species in this genus.
Achaearanea is a genus of comb-footed spiders that was first described by Embrik Strand in 1929.
Stemmops is a genus of comb-footed spiders that was first described by Octavius Pickard-Cambridge in 1894.
Chrosiothes is a genus of comb-footed spiders that was first described by Eugène Louis Simon in 1894. It is considered a senior synonym of Theridiotis.
The Crenuchidae, South American darters, are a family of freshwater fish of the order Characiformes. The 12 genera include about 74 species, though several species are undescribed. These fish are relatively small and originate from eastern Panama and South America. Both subfamilies were previously included in the family Characidae, and were placed in a separate family by Buckup, 1998. Buckup, 1993, revised all genera, except Characidium.
Parotocinclus is a genus of fish in the family Loricariidae native to South America. This genus is distributed through almost all hydrographic systems in South America from the Guyana Shield drainages and Amazon Shield tributaries to the coastal drainages of eastern and southeastern Brazil, including the rio São Francisco basin. Most species have the caudal peduncle oval in cross section. It has been found that Characidium species may interact with P. maculicauda. The small Characidium will follow grazing P. maculicauda, which release particulate matter dislodged from the catfish's foraging.
Hyalella is a genus of amphipods found in the Americas. They are mainly found in freshwater habitats.
Heptapterus is a genus of three-barbeled catfishes native to South America.
Cryptachaea is a genus of spiders in the Theridiidae family.
The Aeglidae are a family of freshwater crustaceans currently restricted to South America. They are the only anomurans to be found in fresh water except for a single hermit crab species, Clibanarius fonticola, on Espiritu Santo, Vanuatu. They live between 20° S and 50° S, at altitudes between 320 and 3,500 m (1,050–11,480 ft).
Ammocryptocharax is a genus of South American darters. There are currently four described species in this genus.
Characidium is a genus of fish in the family Crenuchidae. They are mainly found in South America, but C. marshi is from Panama. They are small, slender fish that live on the bottom in flowing fresh waters and feed on small animals such as insects.
Melanocharacidium is a fish genus in the family Crenuchidae. They are found in the Amazon, Orinoco and Araguaia basins, as well as river basins of the Guianas. They are small fish, up to around 10 cm (4 in) in standard length.
Poecilocharax is a genus of South American darters in the family Crenuchidae from the Amazon, Orinoco and Potaro basins. There are currently four described species in this genus.
Zimiromus is a genus of ground spiders that was first described by Nathan Banks in 1914.
Radulphius is a genus of spiders in the family Cheiracanthiidae. It was first described in 1891 by Keyserling. As of 2017, it contains 15 species, all from Brazil.
Neopisinus is a genus of comb-footed spiders that was first described by M. A. L. Marques, E. H. Buckup & E. N. L. Rodrigues in 2011.
Tekellina is a genus of comb-footed spiders that was first described by Herbert Walter Levi in 1957.
Stanley Howard Weitzman was a Research Scientist Emeritus at Division of Fishes, National Museum of Natural History, Washington, D.C.
Parastacus is a genus of southern crawfish in the family Parastacidae. There are about 15 described species in Parastacus, found in South America. In addition, there are some preserved specimens from Australia that are possibly members of this genus.
Iguanodectidae is a family of freshwater fish in the order Characiformes that lives in South America. It is home to the subfamily Iguanodectinae and the monotypic Bryconops clade. Several species in the family, such as the green line lizard tetra, the tailspot tetra, and the orangefin tetra, are sometimes taken as aquarium fish.
 | This Characiformes-related article is a stub. You can help Wikipedia by expanding it. |