original description(ofTheristus velox Bastian, 1865)Bastian, H. C. (1865). Monograph of the Anguillulidae, or Free Nematoids, Marine, Land, and Freshwater; with Descriptions of 100 New Species. <em>The Transactions of the Linnean Society of London.</em> Volume XXV. Part II:73-184., available online athttps://doi.org/10.1111/j.1096-3642.1865.tb00179.x[details]