Laboratorio de Parasitología y Sanidad Acuícola, Instituto de Investigaciones de la Amazonía Peruana (IIAP), Iquitos, Peru.
Programa de Pós-graduação em Ciência Animal (PPGCA), Universidade Estadual do Maranhão (UEMA), São Luís, Brazil.
Acta Parasitol. 2024 Sep;69(3):1674-1681. doi: 10.1007/s11686-024-00895-y. Epub 2024 Aug 21.
The present study describes three new dactylogyrid species infecting the gill filaments of cichlid fishes (Cichliformes: Cichlidae) from the Amazon basin, Peru: Sciadicleithrum amazoniensis n. sp. on Biotodoma cupido (Heckel, 1840), and Sciadicleithrum feliciajaramae n. sp. and Sciadicleithrum souzatecci n. sp. on Bujurquina peregrinabunda Kullander, 1986.
Some monogeneans were stained with Gomori's trichrome and mounted in Canada Balsam to determine internal soft structures. Others were cleared in Hoyer's medium for the study of sclerotized structures. Drawings were made using a drawing tube and a microprojector.
Sciadicleithrum amazoniensis n. sp. is characterized by the presence of a male copulatory organ (MCO) with a coil of approximately 2 counterclockwise rings, an accessory piece articulated to base of the MCO with an expanded proximal end and a bifurcated distal end, and a sinistral vaginal aperture. Sciadicleithrum feliciajaramae n. sp. can be differentiated from all its congeners by its J-shaped MCO with about half a counterclockwise loop and a rod-shaped accessory piece articulated to the base of the MCO, with the distal end bent. Sciadicleithrum souzatecci n. sp. differs from all other members of Sciadicleithrum by having an elongated MCO with about a clockwise loop and a funnel-shaped base. Additionally, Sciadicleithrum souzatecci n. sp. is characterized by its weakly sclerotized, C-shaped accessory piece with a robust middle process.
Present findings are added to the other 26 species previously known in Sciadicleithrum.This is the first data on the parasites of B. peregrinabunda.
本研究描述了在亚马逊盆地秘鲁的慈鲷鱼类（鲈形目：慈鲷科）的鳃丝上发现的三种新的指环虫：感染比氏副唇鱼（Heckel，1840）的 Sciadicleithrum amazoniensis n. sp.，感染布氏副唇鱼（Kullander，1986）的 Sciadicleithrum feliciajaramae n. sp. 和 Sciadicleithrum souzatecci n. sp.。
部分指环虫用 Gomori 三色法染色，用加拿大香脂固定，以确定内部软组织。其他的则在 Hoyer 介质中进行透明处理，以研究硬化结构。绘图使用绘图管和投影仪进行。
Sciadicleithrum amazoniensis n. sp. 的特征是具有一个大约 2 个逆时针环的雄性交配器官（MCO），一个与 MCO 基部相连的带有扩张近端和分叉远端的关节附件，以及一个左侧阴道开口。Sciadicleithrum feliciajaramae n. sp. 可以通过其 J 形 MCO 与大约半圈逆时针环和一个与 MCO 基部相连的棒状附件来与所有同类区分开来，其远端弯曲。Sciadicleithrum souzatecci n. sp. 与 Sciadicleithrum 的所有其他成员不同，它具有一个约顺时针环的拉长的 MCO 和一个漏斗形的基部。此外，Sciadicleithrum souzatecci n. sp. 的特征是其具有弱硬化的 C 形附件，中间有一个粗壮的过程。
目前的发现增加了之前在 Sciadicleithrum 中已知的 26 个物种。这是关于 B. peregrinabunda 寄生虫的第一份数据。
