lapsus
involuntary mistake made while writing or speaking, something long studied in philology
lapsus calami
lapsus; error made in writing
speech error
unsystematic deviation (conscious or unconscious) from the apparently intended form of an utterance
misspelling
error in written language caused by the use of incorrect, missing, or misordered characters
orthographical variant
other spelling of a scientific name of a taxon (a spelling that is not to be used!)
incorrect subsequent spelling
zoological term defined in ICZN 33.3