Abstract
One of the earliest known Spirochaetes from Lamellibranchs was that briefly described by Certes in 1882 from the crystalline style of the oyster. Certes named the parasite Trypanosoma balbianii. In 1891 the same worker recorded the occurrence of the organism in two species of Tapes, namely T. decussatus and T. pullaster. Laveran and Mesnil in 1901 showed that Tr. balbianii probably belonged to the Spirochaetes. The organism is now known as Spirochaeta balbianii.