Transmission au laboratoire et description de l'H?mogr?garine Lainsonia legeri n. sp (Lankesterellidae) parasite de L?zards br?siliens

• Author(s): Landau, Ir?ne ; Lainson, Ralph ; Boulard, Yves ; Shaw, Jeffrey Jon
• Date: 2016
• Origin: Oasisbr
• Subject(s): Lagartos / parasitologia; Brasil (BR)
• Document Type: Journal article
• Language: French

Description

Museum National d'Histoire Naturelle. Laboratoire de Zoologie. Paris, Fran?a.

Minist?rio da Sa?de. Funda??o Servi?os de Sa?de P?blica. Instituto Evandro Chagas. Bel?m, PA, Brasil.

Museum National d'Histoire Naturelle. Laboratoire de Zoologie. Paris, Fran?a.

Minist?rio da Sa?de. Funda??o Servi?os de Sa?de P?blica. Instituto Evandro Chagas. Bel?m, PA, Brasil.

Lainsonia legeri n. sp., Lankesterellidae, a parasite of Tupinambis nigropunctatus Spix, 1825, from Belem (Para, Brazil), was transmitted in the laboratory both by intraperitoneal and intra-oesophageal inoculation of blood from infected Lizards to clean young Tupinambis. The parasitaemia became patent between the 36th and 48th day ; schizogony and sporogony occur in the reticulo-endothelial system of the host. Rapid dissemination of infective forms to alI the tissues of the vertebrate host is ensured by a special mechanism: oocysts mar become detached from the walls of the vessels at their sites of development (lungs, kidney and brain) and migrate throughout the circulation to the other tissues. This is probably an adaptative mechanism to facilitate the transmission by predation from Vertebrate to Vertebrate. The authors propose to include the three genera Lainsonia, Lankesterella and Schellackia in a single family, the Lankesterellidae, which has the priority to the Schellackiidae.

Lainsonia legeri n. sp., Lankesterellidae, parasite de Tupinambis nigropunctatus Spix, 1825, de Belem (Para, Br?sil) a ?t? transmis au laboratoire par inoculation ent?rale et parent?rale de sang de L?zards infect?s ? de jeunes Tupinambis sains ; Ia parasit?mie est apparue entre le 36 et le 48 jour; Ia schizogonie et Ia sporogonie ?voluent dans le systeme r?ticuloendoth?lial de l'h?te. Un m?canisme tr?s particulier permet une diss?mination lapide des formes infectantes dans tout l'organisme de l'h?te vert?br?: les oocystes se d?tachent de Ia paroi des vaisseaux de leur lieu de formation (poumon, rein, cerveau) pour circuler dans le sang et m?tastaser ? distance. Il s'agit l?, probablement, d'une adaptation ? Ia transmission par pr?dation de Vert?br? ? Vert?br?. Les auteurs proposent de r?unir les trois gemes Lainsonia, Lankesterella et Schellackia dans une seule famille, les Lankesterellidae, qui ont priorit? SUl les Schellackiidae.