Trypanosomes and trypanosomiasis / by A. Laveran and F. Mesnil. : Translated and much enlarged by David Nabarro.

  • Laveran, Alphonse, 1849-1922.
Date:
1907
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Licence: In copyright

Credit: Trypanosomes and trypanosomiasis / by A. Laveran and F. Mesnil. : Translated and much enlarged by David Nabarro. Source: Wellcome Collection.

Provider: This material has been provided by London School of Hygiene & Tropical Medicine Library & Archives Service. The original may be consulted at London School of Hygiene & Tropical Medicine Library & Archives Service.

    63/568 (page 39)
    Schaudinn^ has also suggested that Trypanosoma is closely related to both Herpeiomonas and Trypanoplasma. _ To sum up, all authors are agreed in recognising the connec- tion between Trypanosoma and the genera without undulating membrane, such as Hcrpdomonas of Kent and Cnthtcha of Leger, which are nearly all parasitic in the intestine of insects. _ Indeed, everything tends to show that this is the correct view It is only necessary to compare the figures which Leger gives ot Herpeiomonas and Crithidia (two of them are reproduced in t^ig. 4, Fig. 4.—1-3, Flagellates 4-6, Spermatozoa ; noctiluca. 7> 5 6 Flagellated Spore OF I. Crithidia minuta 'Leger, from the gut of Tabanus iergestinus (after Leger). 2. Herpeto- monas jaculum Leger, from the gut of Nepa cinerea (after Leger). 3. Herpetovionas muscm-domesticcB Burnett (after Prowazek). 4. Immature spermatozoon of Rana fitsca (after Broman). 5. Immature spermatozoon of the snail, Helix pomatia (after von KorfT;. 6. Adult spermatozoon of Bo7ttbinator (after Broman) 7. Flagellated spore of Noctiluca (after Ishikawa). rod ; m, undulating membrane. n, Nucleus ; c,c^, c^, centrosomes ; &, supporting / and 2) with those of the developmental or cultural forms of T. lewisi, to be struck by their great similarity. The difference in the adult forms consists only in the presence of an undulating membrane in Trypanosoma and its absence in the genera studied by Leger.- This is to be regarded primarily as a character of adaptability, and correlated with the parasitic mode of existence of trypanosomes. It has appeared, doubtless for analogous reasons, in a group of organisms very different from the trypano- ^ Schaudinn, Arb. n. d. kaiserl. Gesujid., v. 20, 1904, p. 387. ^ [We have seen, however, that a rudimentary undulating membrane has since been described in certain species of Herpeiomonas. This makes the resemblance of these organisms to Trypanosoma still greater.]