León Fernando Lucas Prats, Pérez Mercedes Martínez
Parasitology Laboratory, Research Fisheries Center, 246 Street # 503 / 5th Ave. and Mar, Barlovento, Santa Fe, La Habana, 19100, Cuba.
Syst Parasitol. 2017 Nov;94(9):1033-1038. doi: 10.1007/s11230-017-9753-1. Epub 2017 Oct 11.
A new species of Trichodina Ehrenberg, 1830 collected from the skin and fins of farmed North African catfish Clarias gariepinus (Burchell) fingerlings, is described. The new species can be distinguished from other trichodinids by the characteristics of the adhesive disc, especially by the great number of denticles. Trichodina merciae n. sp. is morphologically similar to T. renicola (Mueller, 1931) and T. marplatensis Martorelli, Marcotegui & Alda, 2008, in the number of denticles, but differs in the morphometric data, denticle morphology, environment and location. Trichodina merciae n. sp. has broad sickle-shaped blades and thin, straight rays, while T. marplatensis has broad club-shaped blades and wide S-shaped rays. Besides, denticle length, blade length, ray length, width of central part and denticle span of the new species are greater than T. marplatensis. However, the diameter of denticle ring and the diameter of the central area in T. marplatensis is larger than the ones in T. merciae n. sp. This is the first record of freshwater ectoparasite trichodinid with an average number of denticles greater than 50.
描述了一种从养殖的非洲鲶鱼（Clarias gariepinus (Burchell)）幼鱼的皮肤和鳍上采集到的艾氏车轮虫属（Trichodina Ehrenberg, 1830）新物种。该新物种可通过附着盘的特征，特别是通过大量的小齿与其他车轮虫属物种区分开来。梅氏车轮虫（Trichodina merciae n. sp.）在小齿数量上与肾形车轮虫（T. renicola (Mueller, 1931)）和马尔普拉塔车轮虫（T. marplatensis Martorelli, Marcotegui & Alda, 2008）形态相似，但在形态测量数据、小齿形态、环境和位置上有所不同。梅氏车轮虫具有宽阔的镰刀形叶片和细直的辐条，而马尔普拉塔车轮虫具有宽阔的棒形叶片和宽的S形辐条。此外，新物种的小齿长度、叶片长度、辐条长度、中心部分宽度和小齿跨度均大于马尔普拉塔车轮虫。然而，马尔普拉塔车轮虫的小齿环直径和中心区域直径大于梅氏车轮虫。这是淡水外寄生车轮虫属中平均小齿数量大于50的首次记录。
