sentences:  Both "Kluyveromyces" and "Saccharomyces" are considered a part of the ""Sacchromyces" complex", subclade of the Saccharomycetes.Using 18S rRNA gene sequencing, it was suggested that "K. marxianus", "K. aestuarii", "K. dobzhanskii", "K. lactic", "K. wickerhamii", "K. blattae", "K. thermotolerans", and "K. waltii" collectively constituted a distinct clade of separate ancestry from the central clade in the genus "Kluyveromyces".Within this complex, two categories are defined based on the presence in certain taxa of a whole-genome duplication event