''Arionellus''
Barrande, 1850, is a disused name for a
genus
Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...
of
trilobite
Trilobites (; meaning "three-lobed entities") are extinction, extinct marine arthropods that form the class (biology), class Trilobita. One of the earliest groups of arthropods to appear in the fossil record, trilobites were among the most succ ...
. The name ''Arionellus'' was a replacement for ''Arionides''
Barrande, 1847, itself a replacement for ''Arion''
Barrande, 1846, which was preoccupied because
Férussac had already used it in 1819 for a genus of
slugs
Slug, or land slug, is a common name for any apparently shell-less terrestrial gastropod mollusc. The word ''slug'' is also often used as part of the common name of any gastropod mollusc that has no shell, a very reduced shell, or only a sma ...
.
''Agraulos'' had already been proposed as replacement for ''Arion'' by Hawle and Corda in 1847, but Barrande unjustly considered it a
homonym
In linguistics, homonyms are words which are either; '' homographs''—words that mean different things, but have the same spelling (regardless of pronunciation), or '' homophones''—words that mean different things, but have the same pronunciat ...
of
''Agraulis'', a butterfly named by
Boisduval in 1836.
The species of ''Arionellus'' have now been reassigned to the following genera.
* ''A. bipunctatus''
= ''
Croixana bipunctata''
* ''A. ceticephalus''
= ''
Agraulos ceticephalus''
* ''A. convexus''
= ''
Camaraspis convexa''
* ''A. cylindricus''
= ''
Keithiella cylindrica''
* ''A. oweni''
= ''
Modocia oweni''
* ''A. primaevus''
= ''
Strenuaeva primaeva''
* ''A. pustulatus''
= ''
Glaphurus pustulatus''
* ''A. texanus''
= ''
Tricrepicephalus texanus''
* ''A. tripunctatus''
= ''
Tricrepicephalus tripunctatus''
References
{{Set index article, animals
Disused trilobite generic names
Taxa named by Joachim Barrande