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Type species Lamarck created an unnecessary new name of Arenicola piscatorum, instead of recombining Lumbricus marinus into his new genus Arenicola as A. marinus. While the name A piscatorum is the only binomen Lamarck used in Arenicola, it is an objective junior synonym of Lumbricus marinus. The name of a type species should be cited by its original binomen, in this case Lumbricus marinus (Code recommendation 67B) [details]