A MONA number (short for Moths of North America), or Hodges number after Ronald W. Hodges, is part of a numbering system for North American moths found north of

Mexico Mexico (Spanish: México), officially the United Mexican States, is a country in the southern portion of North America. It is bordered to the north by the United States; to the south and west by the Pacific Ocean; to the southeast by Guatema ...

in the

Continental United States The contiguous United States (officially the conterminous United States) consists of the 48 adjoining U.S. states and the Federal District of the United States of America. The term excludes the only two non-contiguous states, Alaska and Hawaii ...

and

Canada Canada is a country in North America. Its ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, covering over , making it the world's second-largest country by tot ...

, as well as the island of

Greenland Greenland ( kl, Kalaallit Nunaat, ; da, Grønland, ) is an island country in North America that is part of the Kingdom of Denmark. It is located between the Arctic and Atlantic oceans, east of the Canadian Arctic Archipelago. Greenland i ...

. Introduced in 1983 by Hodges through the publication of ''Check List of the Lepidoptera of America North of Mexico'', the system began an ongoing numeration process in order to compile a list of the over 12,000 moths of North America north of Mexico. The system numbers moths within the same family close together for identification purposes. For example, the species '' Epimartyria auricrinella'' begins the numbering system at 0001 while '' Epimartyria pardella'' is numbered 0002. The system has become somewhat out of date since its inception for several reasons: # Some numbers no longer exist as the species bearing the number have been reclassified into other species. # Some species have been regrouped into a different family and their MONA numbers are out of order taxonomically. # New species have been discovered since the implementation of the MONA system, resulting in the usage of decimal numbers as to not disrupt the numbering of other species. Despite the issues above, the MONA system has remained popular with many websites and publications. It is the most popular numbering system used, largely replacing the older McDunnough Numbers system, while some published lists prefer to use other forms of compilation. The Moth Photographer's Group (MPG) at Mississippi State University actively monitors the expansive list of North American moths utilizing the MONA system and updates their checklists in accordance with publishings regarding changes and additions.

References

{{reflist Biological classification