Skuja (1939)

• Skuja, H. 1939. Beitrag zur Algenflora Lettlands II. Acta Horti Botanici Universitatis Latviensis 11/12(1–3): 41–169. Full issue. Reference page. 

• Flagellatae [p. 51]
  • Protaspidaceae
    • Protaspis

Popovský & Pfiester (1990)

Popovský, J., & Pfiester, L.A. (1990). Dinophyceae (Dinoflagellida). In: Ettl, H., Gerloff, J., Heynig, H., Mollenhauer, D. (eds.): Süßwasserflora von Mitteleuropa, Band 6. Stuttgart: Gustav Fischer Verlag, 272 p., .

[See Algae]

• Class Dinophyceae (Dinoflagellida)
  • Subclass Adinophycidae
    • Order Desmomastigales
      • Family Protaspidaceae Skuja
        • Genus Protaspis Skuja

Patterson & Zölffel (1991)

Patterson, D.J. and Zölffel, M., 1991. Heterotrophic flagellates of uncertain taxonomic position. In: Patterson, D. J. and Larsen, J. (editors), The Biology of Free-Living Heterotrophic Flagellates. Oxford, Oxford University Press, p. 427-476, .

• "free-living heterotrophic flagellates"
  • "heterotrophic flagellates of uncertain taxonomic position"
    • Family Thaumatomastigidae Patterson & Zölffel, 1991
      • 3. Genus Protaspis Skuja, 1939

Patterson (1993)

Patterson, D. J. 1993. The current status of the free-living heterotrophic flagellates. J. Euk. Microbiol. 40: 606–609.

"free-living heterotrophic flagellates"

• group A (taxa with an ultrastructural identity)
  • Hyperchondria
    • Stramenopiles sm
      • Protaspis inc. sedis

Hoppenrath & Leander (2006)

Hoppenrath, M. & Leander, B.S. (2006); Dinoflagellate, euglenid or cercomonad? The ultrastructure and molecular phylogenetic position of Protaspis grandis n. sp. J Eukaryot Microbiol 53:327–342, .

Cercozoa Cavalier-Smith 1998, emend. Adl et al. 2005

• Cercomonadida Poche 1913, emend. Vickerman 1983, emend. Mylnikov 1986
  • Heteromitidae Kent 1880, emend. Mylnikov 1990, emend. Mylnikov and Karpov 2004
    • Protaspis Skuja 1939
      • Protaspis glans Skuja 1939
      • Protaspis maior Skuja 1939
      • Protaspis metarhiza Skuja 1939
      • Protaspis obovata Skuja 1948
      • Protaspis tanyopsis Norris 1961
      • Protaspis gemmifera Larsen and Patterson 1990
      • Protaspis obliqua Larsen and Patterson 1990
      • Protaspis tegere Larsen and Patterson 1990
      • Protaspis verrucosa Larsen and Patterson 1990
      • Protaspis simplex Vørs 1992
      • Protaspis grandis Hoppenrath et Leander n. sp

Howe et al. (2011)

Howe, A. T., Bass, D., Scoble, J. M., Lewis, R., Vickerman, K., Arndt, H., & Cavalier-Smith, T. (2011). Novel cultured protists identify deep-branching environmental DNA clades of Cercozoa: new genera Tremula, Micrometopion, Minimassisteria, Nudifila, Peregrinia. Protist, 162(2), 332-372.

Cercozoa

• Filosa
  • Infraphylum Monadofilosa Cavalier-Smith 1997 stat. n.
    • Class Thecofilosea Cavalier-Smith, 2003 em.
      • Order Cryomonadida Cavalier-Smith, 1993 em.
        • Family Protaspidae Cavalier-Smith, 1993.
          • Genus Protaspa Cavalier-Smith nom. n. (replacement name for Protaspis Skuja, 1939, preoccupied by the Devonian fish Protaspis Bryant, 1933)
          • Genus Cryothecomonas Thomsen, Buck, Bolt & Garrison, 1991