After

<==o Themsitidae Cutler & Gibbs, 1985
   `--o Themiste Gray, 1828 [Dendrostomum Grübe & Oersted, 1858; Dendrostoma Keferstein, 1865]
      |--o (Themiste) Gray, 1828
      |  |-- T. (T.) alutacea (Grübe & Oersted, 1858) [Dendrostomum alutaceum Grübe & Oersted, 1858; Sipunculus orbiniensis de Quatrefages, 1865; Dendrostomum petrolicum Amor, 1964; Dendrostomum rosaceum Amor, 1964]
      |  |-- T. (T.) blanda (Selenka & Man, 1883) [Dendrostomum blandum Selenka & Man, 1883]
      |  |-- T. (T.) dyscrita (Fischer, 1952) [Dendrostomum dyscritum Fischer, 1952]
      |  |-- T. (T.) hennahi Gray, 1828 [Sipunculus rapa de Quatrefages, 1865; Dendrostomum ramonum de Quatrefages, 1865; Dendrostoma peruvianum Collin, 1892; Dendrostoma mytheca Chamberlin, 1920; Dendrostoma zostericolum Chamberlin, 1920; Dendrostoma perimeces Fischer, 1928; Dendrostomum lissum Fischer, 1952; Dendrostomum schmitti Fischer, 1952]
      |  `-- T. (T.) pyroides (Chamberlin, 1920) [Dendrostoma pyroides Chamberlin, 1920; Dendrostoma petraeum Fischer, 1928; Dendrostoma hexadactylum Satí, 1930]
      `--o (Lagenopsis) Edmonds, 1980
         |-- T. (L.) cymodoceae (Edmonds, 1956) [Dendrostoma cymodoceae Edmonds, 1956]
         |-- T. (L.) dehamata (Kesteven, 1903) [Dendrostoma dehamatum Kesteven, 1903; Dendrostoma ellipticum Satí, 1934; Dendrostoma fischeri Amor, 1964]
         |-- T. (L.) laginiformis Baird, 1868 [Dendrostoma cymodoceae Edmonds, 1956]
         |-- T. (L.) cymodoceae (Edmonds, 1956) [Dendrostoma signifer Selenka & de Man, 1883; Phascolosoma pyriformis Lanchester, 1905; Dendrostoma tropicum Satí, 1942; Dendrostoma stephensoni Stephen, 1942; Dendrostoma minor Chin, 1947; Dendrostoma robertsoni Stephen & Roberston, 1952]
         |--o T. (L.) minor (Ikeda, 1904) [Dendrostoma minor Ikeda, 1904]
         |  |-- T. (L.) m. minor (Ikeda, 1904) [Dendrostoma minor Ikeda, 1904; Dendrostomum fuscum Edmonds, 1960; Golfingia coriacea Murina, 1972]
         |  `-- T. (L.) m. huttoni (Benham, 1903) [Phascolosoma huttoni Benham, 1903]
         `-- T. (L.) variospina Edmonds, 1956

Reference(s):

Special thanks to:

Jos H. M. Dols, for gathering additional information and species of these animals.