After the “Paleobiology Database”

    †Plesiocetus Van Beneden 1859
        †Plesiocetus Van Beneden, 1859
        †Plesiocetopsis Brandt, 1873
        †Cetotherium; Lydekker, 1887
        †Plesiocetus; Cope, 1890
        †Plesiocetus; Trouessart, 1898
        †Plesiocetus; Simpson, 1945
        †Plesiocetus; Barnes, 1976
        †Plesiocetus; Carroll, 1988
        †Plesiocetus; McKenna & Bell, 1997
        †Plesiocetus; Sepkoski, Jr., 2002
        †Plesiocetus; Demere et al., 2005

        †Plesiocetus brialmonti Van Beneden 1880

        †Plesiocetus burtinii Van Beneden 1859
            †Plesiocetus burtinii Van Beneden, 1859
            †Plesiocetopsis burtinii (Van Beneden); Brandt, 1873
            †Plesiocetus burtinii Van Beneden; Trouessart, 1898

        †Plesiocetus cuvieri (Desmoulins 1822)
            †Balaenoptera cuvieri Desmoulins, 1822
            †Plesiocetus cuvieri Trouessart, 1898
            †Balaenoptera cuvieri Trouessart, 1898
          including:
            †Plesiocetus portisi Sacco, 1890; Trouessart, 1898

        †Plesiocetus dubius (Brandt, 1873); Van Beneden, 1880
            †Cetotheriomorphus dubium Brandt, 1873
            †Plesiocetus dubius; Van Beneden, 1880
            †Cetotherium dubium; Trouessart, 1898

        †Plesiocetus dyticus Cabrera, 1926

        †Plesiocetus garopii Van Beneden, 1859
            †Plesiocetus garopii Van Beneden, 1859
            †Balaenoptera musculoides Van Beneden, 1880
            †Plesiocetus garopii Demere, 1986
            †Plesiocetus garopii Demere et al., 2005
          including:
            †Balaenoptera musculoides Van Beneden, 1882
            †Balaenoptera garopii Demere, 1986

        †Plesiocetus gervaisii Van Beneden & Gervais, 1868
            †Plesiocetus gervaisii Van Beneden & Gervais, 1868
            †Plesiocetopsis gervaisii Brandt, 1873
            †Plesiocetus gervaisii Van Beneden & Gervais, 1880
            †Plesiocetus gervaisii Trouessart, 1898
            †Cetotherium gervaisii Trouessart, 1898
            †Plesiocetus gervaisii Uhen, 2006
          including:
            †Plesiocetus becanii Van Beneden, 1871

        †Plesiocetus hupschii Van Beneden, 1859
            †Plesiocetus hupschii Van Beneden, 1859
            †Cetotherium hupschii Van Beneden, 1859
            †Plesiocetopsis hupschii Brandt, 1873
            †Plesiocetus hupschii Van Beneden, 1880
            †Plesiocetus hupschii Trouessart, 1898
 
        †Plesiocetus notopelagicus Cabrera, 1926

        †Plesiocetus robustus Trouessart, 1898

        †Plesiocetus vandellii (Van Beneden & Gervais, 1880)
            †Cetotherium vandellii Van Beneden & Gervais, 1880
            †Plesiocetus vandellii Trouessart, 1898

Reference(s):