“…UCCESSFUL monophasic cultivation of members of s the genus Crithidia (1) has served as an impetus to intensive study of trypanosomatid flagellates. The excellent work of Wallace (12) has re-established this genus and resulted in the creation of a new genus by Laird (4), Blastocrithidia, to receive the group formerly included in Crithidia thru an amendment by Patton (10). The genus as it now exists may be easily separated from those protozoa of other genera of Trypanosomatidae, but separation of species in this homogeneous group is more difficult.…”
SYNOPSIS. Thru the application of technics of serology, cultivation in acid and basic media, host specificity and reaction in foreign hosts it became possible to characterize 10 species of Crithidia and to assign names to 5 of those previously undesignated. Despite a loose host specificity under experimental conditions it was found that each isolate from a different insect host was a different species.
“…Hind gut and rectum. Crithidia rileyi is typical of the genus Crithidia in LCger's original sense ( 14,16,39). It differs from C. minuta LCger ( 17), the other species described from tabanid flies, because the attached forms of the latter are very small.…”
Section: Crithidia Rileyi N Sp (Figs 1-5)mentioning
SYNOPSIS. A new species, Crithidia rileyi (Trypanosomatidae), is described from Tabanus epistates. The most characteristic feature of the flagellate is the frequent occurrence of a broad sucker‐like posterior end. In contrast to other species of Crithidia it multiplied very slowly in the first few weeks after isolation. A review of the literature shows that trypanosomatids of two generic types, Crithidia and Blastocrithidia, have been described from flies of the family Tabanidae, although they have nearly always been regarded as stages of the same organism. Some or all of those of the Blastocrithidia type are stages of Trypanosoma theileri. The Crithidia are probably not stages in the development of any trypanosome.
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