Fossils were discovered in the French Stephanian Coal Measures of Commentry in 1880.
Nemastomoides elaveris was found in the Coal Measures of Commentry in northern France, together with Eotrogulus fayoli.
Called "subtillissimus canonum doctor/a most subtle teacher of canon law" by Tommaso Diplovataccio, John was the compiler of a fine commentry on decretals.