1. Gallardo, V. A. Guyana (Zool.) 10, 3–15 (1963).
2. Leadbetter, E. R. in Bergey's Manual of Determinative Bacteriology (eds Cowan S T et al.) 112–113 (Williams and Wilkins, Baltimore, 1974).
3. Maier, S. Ibid., 115–116.
4. Brandhorst, W. Ber. Landw. Hamburg 43, 148–187 (1967).
5. Hartmann-Schroeder, G. & Hartmann, G. Mitt. Hamb. zool. Mus. Inst. 62, 1–384 (1954).