Adinia xenica is called the Diamond Killifish because the body profile is roughly diamond shaped with a pointed snout. These small fish occur in coastal waters from the Florida Panhandle west to Corpus Christi in fresh, brackish, marine and hypersaline water less than two feet deep and having emergent vegetation. You would think these pretty little fish with the wide tolerance range for salinity changes would be popular with aquarists but they prove to be difficult to maintain in aquaria.
For more information about this and other Ichthylogical delights, visit UT's Fishes of Texas project.
Illustration credit: Joseph Tomelleri