Lophomonas blattarum Stein
Natural hosts.—Blatta orientalis, Czechoslovakia (Stein, 1860); Germany (Bütschli, 1878; Schubotz, 1905; Chen, 1933); U.S.A. (Leidy, 1879a; Kudo, 1922, 1925, 1926, 1926b; McAdow, 1931); Europe (Janicki, 1908); U.S.S.R. (Yakimov and Miller, 1922; Zasukhin, 1930); Poland (Lorenc, 1939).
Blattella germanica, U.S.A., Ohio (McAdow, 1931).
Blattella germanica and/or Periplaneta americana, Egypt (DeCoursey and Otto, 1956, 1957).
Periplaneta americana, England (Schuster, 1898); Europe (Janicki, 1910); U.S.A. (Kudo, 1926b; McAdow, 1931; Hatcher, 1939; Armer, 1944); Philippine Islands (Hegner and Chu, 1930).
Periplaneta sp., Goa (Mello and Lima Ribeiro, 1924, 1925).
"Küchenschaben," Austria (Bělǎr, 1916).
The protozoan (fig. 2, E) is found in the host's colon, particularly anterior portion; encysted stages of organism are found throughout hind gut. Of 1,400 B. orientalis studied, 32 percent harbored this organism (Kudo, 1925, 1926). Yakimov and Miller (1922) found 7 percent of 124 B. orientalis infested. Zasukhin (1930) found 10 percent of over 3,000 B. orientalis infested. The flagellate does not harm the host and is never present in the host tissue; it should be considered a commensal (Kudo, 1926).