This genus has two subgenera:
Protula (Hydroides)Protula (Protulopsis)The following species are classified in this genus:
Protula alba Benedict, 1887Protula alberti Fauvel, 1909Protula americana McIntosh, 1885Protula anomala Day, 1955Protula antennata Ehlers, 1887Protula apomatoides (Uchida, 1978)Protula atypha Bush, 1905Protula balboensis Monro, 1933Protula bispiralis (Savigny, 1822)Protula canavarii Roverto, 1899 †Protula diomedeae Benedict, 1887Protula extensa Solander in Brander, 1766Protula intestinum (Lamarck, 1818)Protula longiseta Schmarda, 1861Protula media Stimpson, 1854Protula pacifica Pixell, 1912Protula palliata (Willey, 1905)Protula planianica Ziegler, 1984 †Protula submedia Augener, 1906Protula superba Moore, 1909Protula tubularia (Montagu, 1803)Protula vincenti Rovereto, 1904Protula xeniolum Rovereto, 1904The following genera are synonyms of Protula:
Ehlerprotula Uchida, 1978 (junior synonym)Lemintina Risso, 1826 (subjective synonym)Longitubus Howell, 1943 † (subjective synonym)Membranopsis Bush, 1910 (subjective synonym)Paraprotula Uchida, 1978 (junior synonym)Peotula Sun, 1998Protula (Philippiprotula) Uchida, 1978 (subgenus not recognized any longer)Protula (Protula) Risso, 1826 (subgenus not longer recognised)Protula (Psygmobranchus) Philippi, 1844 (subgenus not recognised any longer)Protulopsis Saint-Joseph, 1894 (synonym)Psygmobranchus Philippi, 1844 (junior synonym)Salmacinopsis Bush, 1910Serpula (Helena) CastelnauSerpula (Spiramella)Spiramella Blainville, 1828 (junior synonym)
