Arredondo Nathalia J, Gil de Pertierra Alicia A
Departamento de Biodiversidad y Biología Experimental, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón II, C1428EHA Buenos Aires, Argentina.
Syst Parasitol. 2008 Jul;70(3):223-36. doi: 10.1007/s11230-008-9142-x. Epub 2008 Jun 6.
de Chambrier & Vaucher (1999) compared the proteocephalidean cestode Spatulifer maringaensis Pavanelli & Rego, 1989 from Hemisorubim platyrhynchos (Valenciennes) with similar specimens, which they described as S. cf. maringaensis, parasitising Sorubim lima (Bloch & Schneider) collected in the Paraná and Paraguay Rivers. No remarkable differences between these worms were found by these authors, except for the scolex diameter and a different infection rate in each fish host. In order to elucidate the taxonomic status of the fish cestode Spatulifer cf. maringaensis from Sorubim lima, type and voucher material of S. maringaensis from H. platyrhynchos, and voucher and new material recently collected from Sorubim lima in Argentina are described in terms of their internal morphology and tegumental surface. During the study, mature and gravid worms with smaller metascoleces were found among voucher specimens from both hosts and in the new material from S. lima. The number of testes in the type-material was difficult to assess, but it could be determined in the voucher material from the type-host as being within the range of the specimens from S. lima. Both taxa are morphologically identical and can therefore be considered as conspecific. The data on their parasitological indices support the idea that S. lima is the principal final host and H. platyrhynchos is a secondary final host. Spatulifer maringaensis is widespread throughout the Paraná basin. A comparison of the microthrix pattern of S. maringaensis with that of S. rugosa (Woodland, 1935) revealed that they have the same type of microtriches, but with a different distribution, size and density. Tumuli were observed for the first time in a Neotropical taxon. Some studies have shown that the microthrix pattern is useful for characterising and discriminating species of the Proteocephalidea, and it was used herein as a tool for determining the conspecificity of S. cf. maringaensis with S. maringaensis.
德尚布里尔和沃谢（1999年）将采自扁吻半鲿（瓦朗谢讷）的1989年命名的马林加叶形头绦虫Spatulifer maringaensis Pavanelli & Rego与类似标本进行了比较，他们将这些标本描述为S. cf. maringaensis，这些标本寄生于在巴拉那河和巴拉圭河采集的利马真鮰（布洛赫 & 施奈德）体内。除了头节直径以及每种鱼类宿主中的不同感染率外，这些作者未发现这些绦虫之间有显著差异。为了阐明采自利马真鮰的叶形头绦虫Spatulifer cf. maringaensis的分类地位，本文根据其内部形态和体表特征描述了采自扁吻半鲿的马林加叶形头绦虫的模式标本和凭证标本，以及最近在阿根廷采自利马真鮰的凭证标本和新材料。在研究过程中，在来自两种宿主的凭证标本以及来自利马真鮰的新材料中发现了成熟和妊娠的、具有较小后吸盘的绦虫。模式标本中的睾丸数量难以评估，但可以在来自模式宿主的凭证标本中确定其在利马真鮰标本的范围内。这两个分类单元在形态上相同，因此可以被视为同种。它们的寄生虫学指标数据支持了利马真鮰是主要终末宿主而扁吻半鲿是次要终末宿主的观点。马林加叶形头绦虫广泛分布于巴拉那河流域。将马林加叶形头绦虫的微毛模式与皱纹叶形头绦虫（伍德兰，1935年）的微毛模式进行比较发现，它们具有相同类型的微毛，但分布、大小和密度不同。首次在一个新热带分类单元中观察到瘤状突起。一些研究表明，微毛模式有助于叶形头科物种的特征描述和鉴别，本文将其用作确定S. cf. maringaensis与马林加叶形头绦虫同种性的工具。
