‘The ninth segment in insects’, for which modern dictionaries cite ‘Maunder’, is a blunder for ennaton ( < ἔννατον late spelling of Greek ἔνατον ninth) which appears in Maunder's Treas. Nat. Hist. 1848–54, but not in later editions. We have no evidence that the word was ever in English use.
This entry has not yet been fully updated (first published 1891; most recently modified version published online June 2021).