Moravec Frantisek, Santos Cláudia P
Institute of Parasitology, Biology Centre of the Academy of Sciences of the Czech Republic, Branisovská 31, 37005 Ceské Budĕjovice, Czech Republic.
J Parasitol. 2009 Jun;95(3):634-8. doi: 10.1645/GE-1887.1.
Previously undescribed infective larvae of the cystidicolid nematode Pseudoproleptus sp. (probably conspecific with the nematode originally described as Heliconema izecksohni Fabio, 1982, a parasite of freshwater fish in Brazil), were found encapsulated in the hemocel of the Amazon river prawn Macrobrachium amazonicum (Heller) (Decapoda: Palaemonidae) from the natural canals on the Mexiana Island (Amazon River Delta), Pardá State, Brazil. The prevalence in prawns (body length 48-110 mm) examined in January and March 2008 (n = 44) was 32%, with an intensity of 1-6 (mean 2) larvae per crustacean. The nematode larvae (body length 19.7-25.7 mm), characterized by the cephalic end provided with a helmet-like cuticular structure having a thickened free posterior margin, are described based on light and scanning electron microscopy. Apparently prawns play a role as intermediate hosts for this nematode species. This is the first record of a larval representative of Cystidicolidae in South America and the first record of a species of Pseudoproleptus Khera, 1955, in the Neotropics. Heliconema izecksohni is transferred to Pseudoproleptus as Pseudoproleptus izecksohni (Fabio, 1982) n. comb.
在巴西帕拉州梅希亚纳岛（亚马逊河三角洲）天然运河的亚马逊河对虾Macrobrachium amazonicum（Heller）（十足目：长臂虾科）血腔内，发现了囊袋线虫属Pseudoproleptus sp.先前未描述过的感染性幼虫（可能与最初描述为Heliconema izecksohni Fabio，1982的线虫同种，后者是巴西淡水鱼的寄生虫）。在2008年1月和3月检查的对虾（体长48 - 110毫米）（n = 44）中，感染率为32%，每只甲壳动物体内幼虫数量为1 - 6条（平均2条）。基于光学显微镜和扫描电子显微镜对该线虫幼虫（体长19.7 - 25.7毫米）进行了描述，其头部末端具有一个头盔状的表皮结构，后缘游离且增厚。显然，对虾是该线虫物种的中间宿主。这是南美囊袋线虫科幼虫代表的首次记录，也是新热带区1955年Khera的Pseudoproleptus属物种的首次记录。Heliconema izecksohni被转移到Pseudoproleptus属，新组合为Pseudoproleptus izecksohni（Fabio，1982）。
