Arionellus

Arionellus , is a disused name for a genus of trilobite. The name Arionellus was a replacement for Arionides , itself a replacement for Arion , which was preoccupied because Férussac had already used it in 1819 for a genus of slugs.

Agraulos had already been proposed as replacement for Arion by Hawle and Corda in 1847, but Barrande unjustly considered it a homonym of Agraulis, a butterfly named by Boisduval in 1836.

The species of Arionellus have now been reassigned to the following genera.