Instituto de Ciências e Tecnologia das Águas - ICTA, Universidade Federal do Oeste do Pará (UFOPA), Avenida Mendonça Furtado, no 2946, Fátima, CEP 68040-470, Santarém, PA, Brazil.
Programa de Pós-Graduação em Biodiversidade Tropical da Universidade Federal do Amapá (UNIFAP), Rod. Juscelino Kubitschek, s/n, Jardim Marco Zero, CEP 68903-419 Macapá, AP, Brazil.
Ann Parasitol. 2022;68(1):177-183. doi: 10.17420/ap6801.422.
Objective was the relationship of the parasite Rhadinorhynchus plagioscionis with its host Plagioscion squamosissimus, providing morphological and morphometric data to prove the specificity of this parasite with its host, with reports occurring only in rivers in the Brazilian Amazon. Rhadinorhynchus plagioscionis infected P. squamosissimus captured in the municipal region of Santarém, in the state of Pará, in the eastern Brazilian Amazon. The specimens were analyzed by light and scanning electron microscopy. Morphological data obtained confirmed conspecificty with R. plagioscionis and supplemental information was added to the morphological concept of this species. The body of R. plagioscionis is cylindrical and milky-coloured with dorsal curvature, a long proboscis displaying ventral curvature with 12 longitudinal rows containing 22 to 24 hooks, which are larger and more prominent towards the end of the ventral curvature, and decrease in size in the posterior extremity of the proboscis. The present study describes, in addition to the morphological and morphometric characteristics of R. plagioscionis, which have host specificity for P. squamosissimus, a relationship being reported exclusively in the Brazilian Amazon.
目的是研究寄生虫斜口华鳊鱼虱与宿主圆口铜鱼之间的关系，提供形态学和形态计量学数据，以证明这种寄生虫与其宿主的特异性，因为这种寄生虫的报告仅出现在巴西亚马逊河流域。斜口华鳊鱼虱感染了在巴西亚马逊东部帕拉州圣塔伦市地区捕获的圆口铜鱼。这些标本通过光学显微镜和扫描电子显微镜进行了分析。获得的形态学数据证实了与斜口华鳊鱼虱的同物异性，并且为该物种的形态概念增加了补充信息。斜口华鳊鱼虱的身体呈圆柱形，乳白色，背部弯曲，长长的吻部呈腹面弯曲，有 12 条纵向排列的列，包含 22 到 24 个钩子，这些钩子在腹面弯曲的末端较大且更为突出，并在吻部的后末端逐渐变小。本研究除了描述斜口华鳊鱼虱的形态学和形态计量学特征外，还报告了这种寄生虫与圆口铜鱼之间的关系，这种关系仅在巴西亚马逊地区存在。
