Abstract

As part of a marine ecology study aimed to discover the diversity of fish parasites, we described a new species representing Magnanchor n. gen. and provided new and supplementary morphometric information for Mexicana bychowskyi, both monogenoidean species collected from the gill lamellae of the humpback grunt Microlepidotus brevipinnis (Haemulidae) from the Pacific coast of Mexico. The new genus is proposed for its unique species, M. raris n. sp. which is characterized in having overlapping gonads (testis posterodorsal to the germarium), a copulatory complex consisting of counterclockwise coils of the copulatory organ that is unarticulated to the accessory piece, a haptor armed with two pairs of anchors (each with broad base and well differentiated roots), dorsal and ventral bars, a dextral vaginal aperture, and 6 pairs of hooks with uniform shank and upright acute thumb. Data on morphological and biometric variability of the six species of Mexicana (including illustrations of the haptoral structures of the present specimens of M. bychowskyi) previously described and/or reported parasitizing different haemulid hosts from the Pacific and Atlantic oceans in the Tropics are also provided. Due to the morphological similarities among the amphiamerican species of Mexicana, they could represent sister-species pairs in the Tropics. Magnanchor raris n. sp. and M. bychowskyi (type species of the genus) are the first dactylogyrids described and/or reported on M. brevipinnis.

中文翻译：

---

寄生于墨西哥太平洋海岸的 Microlepidotus brevipinnis（Haemulidae）的指环科（Monogenoidea）：Magnanchor raris n. 将军，n. sp。墨西哥的补充分类信息 bychowskyi Caballero 和 Bravo-Hollis 1959

摘要

作为旨在发现鱼类寄生虫多样性的海洋生态学研究的一部分，我们描述了代表Magnanchor n的新物种。将军 并为Mexicana bychowskyi提供了新的和补充的形态测量信息，这两种单基因物种是从墨西哥太平洋海岸的座头鲸Microlepidotus brevipinnis （Haemulidae）的鳃片中采集的。新属因其独特的物种M. raris n. 被提议。sp。其特征在于具有重叠的性腺（睾丸后背到生殖细胞），交配复合体由未铰接到附件的交配器官的逆时针线圈组成，带有两对锚的臂托（每对锚具有宽的底座和良好的分化）根）、背侧和腹侧杆、右侧阴道孔和 6 对带有均匀钩柄和直立锐拇指的钩子。还提供了先前描述和/或报道的寄生于热带地区太平洋和大西洋的不同血吸虫宿主的墨西哥六种物种的形态和生物特征变异性数据（包括目前的M. bychowskyi标本的触触结构图解）。 。由于墨西哥两栖物种之间的形态相似性，它们可以代表热带地区的姐妹物种对。Magnanchor raris n.玛格南克雷里斯 sp。和M. bychowskyi（该属的模式种）是第一个在M. brevipinnis上描述和/或报道的指状科。