Class Actinopterygii, Order Acipenseriformes, Family Acipenseridae, Genus Scarphirhynchus, Species albus. Pallid Sturgeon are colloquially known as: white hackleback, white shovelnose sturgeon, or white sturgeon. The Pallid Sturgeon has very similar characteristics and ecological niches to its close relative the Shovelnose Sturgeon (Scaphirhynchus platorynchus). For instance, both species are found in open, free–flowing rivers and tributaries in the Missouri and Mississippi Rivers. Both species have a similar diet of insects and fish, albeit the Pallid Sturgeon tends to be more piscivorous. In the larval stage, the two are indistinguishable until they reach a total length (front of snout to end of tail) of ~10 mm. At this point, the barbels can be used as an indicator for the two species. The inner and outer barbels for Shovelnose sturgeon are relatively similar in length. Pallid Sturgeon's outer barbels tend to extend further than their inner barbels (Figure 2; Ross 2011). The striking similarities between Pallid Sturgeon and Shovelnose Sturgeon make differentiating the two species difficult.