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Artigo
Plasmodium carmelinoi n. sp. (Haemosporida: Plasmodiidae) of the lizard Ameiva ameiva (Squamata: Teiidae) in Amazonian Brazil
Plasmodium carmelinoi n. sp. is described in the teiid lizard Ameiva ameiva from north Brazil. Following entry of the merozoites into the erythrocyte, the young, uninucleated trophozoites are at first tearshaped and already possess a large vacuole: with growth, they may assume an irregular shape,...
Autor principal: | Lainson, Ralph |
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Outros Autores: | Franco, C. M, Matta, R. da |
Grau: | Artigo |
Idioma: | eng |
Publicado em: |
EDP Open
2021
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Assuntos: | |
Acesso em linha: |
http://patua.iec.gov.br//handle/iec/4325 |
Resumo: |
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Plasmodium carmelinoi n. sp. is described in the teiid lizard Ameiva
ameiva from north Brazil. Following entry of the merozoites into the
erythrocyte, the young, uninucleated trophozoites are at first tearshaped and already possess a large vacuole: with growth, they
may assume an irregular shape, but eventually become spherical or
broadly ovoid. The vacuole reduces the cytoplasm of the parasite to
a narrow peripheral band in which nuclear division produces a
schizont with 8-12 nuclei. At first the dark, brownish-black pigment
granules are restricted to this rim of cytoplasm but latterly become
conspicuously concentrated within the vacuole. The mature
schizonts are spherical to ovoid and predominantly polar in
their position in the erythrocyte. They average 5.4 x 4,9 ?m
(4.4 x 4.4 - 6.6 x 5,9 ?m), shape index 1.1, n = 50:
8-12 merozoites are produced and measure approximately
2.0 x 1,0 ?m. Mature gametocytes are also polar in position,
and spherical to subspherical. The macrogametocytes measure
5.7 x 5,2 ?m (4.4 x 4.0 - 5.9 x 5,1 ?m), shape index 1.1,
n = 50 and, following staining by Giemsa?s method, possess a
compact, pink-staining nucleus and a clear blue, faintly stained
cytoplasm. Microgametocytes are slightly larger, 6.0 x 5,0 ?m
(5.2 x 4.4 ? 6.2 x 5,2 ?m), shape index 1.2, n = 45. They stain
an over-all pink colour due to the dispersed nuclear chromatin. The
vacuoles in both the macro- and microgametocytes are considerably
smaller than those of the schizonts and of ovoid or spindle shape:
they contain most of the pigment granules. The sex ratio, as seen in
an inicial intense infection, was 1 male to 2.2 females. Prevalence
of infection was low (5 %) but, due to the very low parasitaemia
which may result in a failure to detect parasites, it is probably
higher than this. |