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''Arionellus'' Barrande, 1850, is a disused name for a genus of trilobite. 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. ''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. * ''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 == 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Arionellus」の詳細全文を読む スポンサード リンク
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