Acantharia
Suggested reading

Febvre C., Febvre J., Michaels A. In press. Subphylum Acantharia Haeckel, 1881. In "An illustrated guide to the Protozoa" Second Edition, (J. Lee, ed.).
—Overview of acantharian biology and classification with examples of representative species.

Haeckel E. 1887. Report on Radiolaria collected by H.M.S. Challenger during the years 1873-1876. Rep. Sci. Res. Voyage H.M.S. Challenger 1873-76, 18:1-1803.
—Detailed monograph covering acantharian morphology and classification with superb illustrations. Many of the species erected in this work were subsequently synonymized or renamed by Schewiakoff (1926).

Reshetnjak V.V. 1981. Akantarii. Fauna SSSR, 123, Akad. Nauk SSSR, Zool. Inst., Nauka, Leningrad, pp. 1-210.
—Excellent review of all aspects of acantharian studies, with detailed treatment of the taxonomy down to the species level (in Russian).

Schewiakoff W. 1926. Die Acantharia des Golfes von Neapel. Fauna Flora Golfo Napoli, Monogr. 37:1-755.
—A cornerstone monograph based on Mediterranean materials, covering all aspects of the knowledge of the group.