Trypanosoma (Megatrypanum) lainsoni n. sp. from Mesomys hispidus (Rodentia: Echimyidae) in Brazil: trypomastigotes described from experimentally infected laboratory mice Author Naiff, Roberto Daibes Author Barrett, Toby Vincent text Parasite 2013 Paris, France 2013-12-09 20 1 5 http://dx.doi.org/10.1051/parasite/2013049 journal article 10.1051/parasite/2013049 1776-1042 PMC3853975 24309069 12524160 6E4F6DFF-D36C-4392-AA4C-12A40137311D Trypanosoma ( Megatrypanum ) lainsoni n. sp. urn:lsid:zoobank.org:act: 7DA83760-8EA2-44D3-BBC4-8C98 64F948A6 Type host: Mesomys hispidus (Desmarest, 1817) ( Rodentia : Echimyidae ). Type locality: municipality of Barcelos ( 00°S 64°W ), state of Amazonas , Brazil . Collector and date: Francisco Lima Santos , July 17, 1995 . Material examined: Hapantotypes, Giemsa-stained films of peripheral blood of experimentally infected laboratory mice: one epimastigote and 28 trypomastigotes, deposited in the Muséum National d 0 Histoire Naturelle, Paris, France ( MNHN ) under registration number MNHN ZS126. Vector: Unknown. Strain-code: IM-4156 (Laboratory designation). Etymology: Specific name in recognition of Professor Ralph Lainson’s contributions to the study of protozoan parasites in the Amazonian fauna of Brazil . Description ( Figures 1–20 ; Table 1 ) Bloodstream trypomastigotes ( Figures 2–20 ) with a mean length of 33.4 including free flagellum and width 4–6. Free flagellum 4.0–10.0 (mean 7.7); undulating membrane well developed. Posterior end of the body long and pointed ( Figures 17–20 ) or cuneiform ( Figure 4 ); anterior end tapering to free flagellum. Nucleus oval, longitudinal or transverse near middle of body with a nuclear index ( NI ) of 0.7–1.4, but mainly 0.9–1.1; kinetoplast closer to nucleus than to posterior end with kinetoplastic index ( KI ) of 2.2–6.0, but mainly 0.9–1.1, and marginal. Other measurements are given in Table 1. A single bloodstream epimastigote was detected, with its nucleus in a strongly posterior position and NI of 0.4 ( Figure 1 ).