The word Nematoidan is misspelled against Nematoidean, an adjective meaning "Nematoid."
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Nematoidean has vowels 'ea' together mispronounced as 'a'
Word contains consecutive vowels 'EA' in between alphabets nematoid & n is misspelled as 'A'
Wrong Spelling:  nematoid-a-n 
Correct Spelling:  nematoid-ea-n 
Find more incorrect spellings of Nematoidean to spell right way.