Cárdenas Melissa Q, Moravec František, Fernandes Berenice M M, Morais Aprigio Mota
Laboratório de Helmintos Parasitos de Peixes, Instituto Oswaldo Cruz, Fiocruz, Av. Brasil 4365, Rio de Janeiro, RJ, Brazil.
Syst Parasitol. 2012 Oct;83(2):137-44. doi: 10.1007/s11230-012-9377-4. Epub 2012 Sep 15.
A new nematode species, Philometra nattereri n. sp. (Philometridae), is described from female specimens found in the oculo-orbits and nasal cavity of the red piranha Pygocentrus nattereri Kner (Characiformes: Characidae) from five lakes in Central Amazonia, Brazil, collected in 2008 and 2009 (overall prevalence 12%, intensity 1-3 nematodes per fish). Based on light and scanning electron microscopical examination, the new species differs from most other congeners parasitising freshwater fishes in that its oesophageal gland extends anteriorly far anterior to the level of the nerve-ring, in the presence of 14 small cephalic papillae arranged in two circles and in having two minute caudal projections. This is the first species of Philometra Costa, 1845 reported from fishes of the family Characidae and the second valid species of this genus parasitic in freshwater fishes of Brazil and South America.
描述了一种新的线虫物种，纳氏费洛梅线虫新种（费洛梅线虫科），该物种采自巴西亚马孙河中部五个湖泊中的红腹食人鱼（纳氏臀点脂鲤，脂鲤目：脂鲤科）的眼窝和鼻腔中的雌性标本，于2008年和2009年采集（总体患病率为12%，感染强度为每条鱼1 - 3条线虫）。基于光学显微镜和扫描电子显微镜检查，该新物种与大多数寄生于淡水鱼的同属物种不同，其食管腺向前延伸至神经环水平之前很远的位置，有14个小的头部乳突排列成两个圆圈，并且有两个微小的尾突。这是1845年费洛梅线虫属中首次报道来自脂鲤科鱼类的物种，也是该属在巴西和南美洲淡水鱼中寄生的第二个有效物种。
