[1] In 2001, paleontologist Kenneth D. Rose and colleagues described additional mammalian remains from the same fossil beds, which were tentatively assigned to A.

[2] The holotype of Arundelconodon consists of a right mandibular ramus (the upward-extending portion on the side of the lower jaw) with five teeth: two premolars and three molars.

[3][4] Priacodon Triconodon Trioracodon Arundelconodon Meiconodon Astroconodon Alticonodon Corviconodon Jugulator Ichthyoconodon Argentoconodon Volaticotherium

Its discovery supports the idea that the mammalian fauna of North America remained consistent throughout the Early Cretaceous, perhaps dating back to the Jurassic, demonstrating no affinities with European or Gondwanan groups.

The Arundel Clay, where it was first found, was dated to the Aptian age in its original description,[1] but later authors have labelled the formation as more likely early Albian.

Aside from the hybodonts, which were likely tolerant of saltwater and consequently widely distributed, all taxon identified at the species level and several genera (including Arundelconodon) are endemic to the site.

The area has been interpreted as either a fringe swamp or, more recently, a floodplain where fossils were preserved in the mud of isolated channels and oxbow lakes.