The generic name of Trypanosoma was conferred by Gruby in 1843 upon the wellknown parasite of frogs.
Dutton, who (11) gave this form the name of Trypanosoma gambiense.
Until lately it remained quite uncertain, however, whether the invertebrate merely conveys the Trypanosomes or whether 1 Trypanosoma equiperdum, the cause of dourine in horses and asses, is apparently only conveyed by the act of coitus.
The end by which the parasites join is typically, in the case of Trypanosoma, the non-flagellate (anterior) end.
That one and the same species may appear entirely different in different phases of the life-history is manifest on comparing, for instance, the chief " forms " of Trypanosoma FIG.
A, Trypanosoma lewisi, after Bradf.
(X2000.) E, Trypanomorpha (Trypanosoma) noctuae, after Schaud.
F, Trypanosoma avium, after Lay.
The genus Trypanosoma, in which are included at present the great majority of Trypanosomes, is rather to be regarded as derived from a Heteromastigine ancestor, such as Trypanoplasma, by the loss of the anterior flagellum.
- Trypanosoma equiperdum (of dourine), in the blood of a rat eight days after inoculation.
3, E), but in other cases - Trypanosoma ziemanni, T.
Both Schaudinn (in the case of Trypanomorpha) and Prowazek (in the case of Trypanosoma lewisi and T.
A,B, Trypanosoma rotatorium, after La y.
J, Trypanosoma soleae, after La y.
- Stages in Binary Longitudinal Fission of Trypanosoma brucei.
The following examples have been investigated: Trypanosoma lewisi (also, but much less completely, T.
Ziemanni and Trypanomorpha noctuae, among avian parasites, described by Schaudinn (50); Trypanosoma inopinatum, among batrachian forms, described by A.
Trypanomorpha (Trypanosoma) noctuae and Trypanosoma (Spirochaete) ziemanni.
Again, the spirochaetiform Trypanosoma (T.
Genus Trypanosoma, Gruby, 1843.
Siedlecki have published an important account (17) of this parasite, which they consider possesses a true trypaniform phase, and for which they have proposed the name Trypanosoma luis.
Nevertheless the resemblance between the biology of this organism in relation to syphilis (as regards mode of infection, habitat, &c.) and that of Trypanosoma equiperdum, the cause of dourine or " horse-syphilis," may not be without significance.
(1904), 1 39, p. 574; (2) " Sur le Trypanosoma inopinatum de la grenouille verte d'Algerie et sa relation possible avec les Drepanidium," C. r.
Plimmer, " The Trypanosoma brucei, the organism found in Nagana or the Tsetsefly disease," Quart.
Castellani, " Trypanosoma and Sleepingsickness," Rep. Sleeping-sickness Comm.
Dutton, " Note on a Trypanosoma occurring in the Blood of Man," Brit.
(1903) I I; (13) Gruby, " Recherches et observations sur une nouvelle espbce d'Hematozoaire (Trypanosoma sanguinis) " C. r.
Hanna, "Trypanosoma in Birds in India," Quart.
Keysselitz, " Ober Trypanophis grobbeni (Trypanosoma grobbeni, Poche)," Arch.
Trypanosoma barbatulae, n.
Minchin, " On the occurrence of encystation in Trypanosoma grayi," &c., Proc. Roy.
Soc. (1907), 79 B, p. 35 .; (41b) idem (with Gray and Tulloch), " Glossina palpalis in relation to Trypanosoma gambiense," &c., op. cit.
Perrin, " The life-history of Trypanosoma balbianii," Proc. Roy.
Schaudinn, " Generationsand Wirthswechsel bei Trypanosoma and Spirochaete," Arb.