Subfamily of viruses
Letovirinae is a subfamily of viruses within the family "Coronaviridae", where it is the only subfamily besides the more diverse "Orthocoronavirinae" (coronaviruses). "Letovirinae" contains one accepted genus, Alphaletovirus, which contains one accepted subgenus, Milecovirus, which contains one accepted species, Microhyla letovirus 1 (MLeV). This species was discovered in 2018 and is hosted by the ornate chorus frog ("Microhyla fissipes"). 
Other, as yet unaccepted species in the "Letovirinae" have been discovered in Pacific salmon ("Oncorhynchus"), and in Murray River carp (Cyprinus).
References.
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