Sarcocystis arctosi sp.nov. [Apicomplexa, Sarcocystidae] from the brown bear [Ursus arctos], and its genetic similarity to schizonts of Sarcocystis canis-like parasite associated with fatal hepatitis in polar bears [Ursus maritimus]

• Autorzy: Dubey J P , Rosenthal B.M. , Sundar N. , Velmurugan G.V. , Beckmen K.B.
• Języki publikacji: EN

Abstrakty

EN

The tissues of herbivores are commonly infected with cysts of parasites belonging to the apicomplexan genus Sarcocystis, but such sarcocysts are rare in bears. Here, we describe a new species, Sarcocystis arctosi, based on the mature sarcocysts identified in two brown bears (Ursus arctos) from Alaska, USA. Microscopic sarcocysts (37–75 × 20–42 μm) had thin walls (<1 μm). The outer layer of the sarcocyst, the parasitophorous vacuolar membrane (pvm), was wavy in outline and had minute undulations that did not invaginate towards the sarcocyst interior; these undulations occurred at irregular intervals and measured up to 100 nm in length and up to 60 nm width. The ground substance layer beneath the pvm was smooth and lacked microtubules. Longitudinally cut bradyzoites measured 5.6–6.8 × 0.7–1.8 μm. A major portion of nuclear small subunit rDNA sequence obtained from these sarcocysts was similar to that previously obtained from the hepatic schizonts of a S. canis-like parasite from polar bears (Ursus maritimus).

Słowa kluczowe

EN

brown bear; Sarcocystidae; polar bear; Protozoa; Apicomplexa; host; genetic similarity; Sarcocystis canis; parasite; Sarcocystis arctosi; fatal hepatitis; Ursus maritimus; Ursus arctos

• Wydawca: -
• Czasopismo: Acta Parasitologica
• Rocznik: 2007
• Tom: 52
• Numer: 4
• Opis fizyczny: p.299-304,fig.,ref.

Twórcy

autor

Dubey J P

• Animal and Natural Resource Institute, BARC-East, Building 1001, 10300 Baltimore Avenue, Beltsvelle, MD 20705-2350, USA

autor

Rosenthal B.M.

autor

Sundar N.

autor

Velmurugan G.V.

autor

Beckmen K.B.

Bibliografia

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