| Issue |
Parasite
Volume 27, 2020
|
|
|---|---|---|
| Article Number | 71 | |
| Number of page(s) | 9 | |
| DOI | https://doi.org/10.1051/parasite/2020067 | |
| Published online | 11 December 2020 | |
urn:lsid:zoobank.org:pub:C8E3BD43-BC8C-4A46-8D79-BB09B1094585
Research Article
Neohexostoma gymnosardae n. sp. (Monogenea, Hexostomatidae), a gill parasite of Gymnosarda unicolor (Valenciennes) (Teleostei, Scombridae) in the South China Sea
Neohexostoma gymnosardae n. sp. (Monogenea, Hexostomatidae), un parasite branchial de Gymnosarda unicolor (Valenciennes) (Teleostei, Scombridae) dans la mer de Chine méridionale
Guangzhou Key Laboratory of Subtropical Biodiversity and Biomonitoring, Guangdong Provincial Key Laboratory for Healthy and Safe Aquaculture, College of Life Science, South China Normal University, Guangzhou 510631, China
* Corresponding author: yk_1256@163.com
Received:
20
July
2020
Accepted:
20
November
2020
Parasite biodiversity of fish in coral reefs of the South China Sea is still incompletely explored. We describe here a new species of Neohexostoma (Monogenea: Hexostomatidae) from the gill filaments of the dogtooth tuna Gymnosarda unicolor (Scombridae), collected off Yongshu Reef, South China Sea. Neohexostoma gymnosardae n. sp. is distinguished from its congeners by the following features: (i) haptor clearly marked from body proper by a strongly constricted peduncle, divided in its posterior margin into two symmetrical lobes, (ii) vagina armed with scattered small blunt spines, (iii) eggs tied by their long polar filaments, (vi) esophagus with several lateral diverticula, (v) intestinal ceca unfused and extending into the haptor. We present an analysis of the relationships of this monogenean based on partial 28S rDNA sequences. An identification key for species of Neohexostoma is provided. This is the first member of the genus Neohexostoma known to parasitize a species of Gymnosarda.
Résumé
La biodiversité parasitaire des poissons dans les récifs coralliens de la mer de Chine méridionale est encore incomplètement explorée. Nous décrivons ici une nouvelle espèce de Neohexostoma (Monogenea, Hexostomatidae) des filaments branchiaux du thon à dents de chien Gymnosarda unicolor (Scombridae), collecté au large du récif de Yongshu, mer de Chine méridionale. Neohexostoma gymnosardae n. sp. se distingue de ses congénères par les caractéristiques suivantes : (i) hapteur clairement séparé du corps proprement dit par un pédoncule fortement resserré, divisé dans sa marge postérieure en deux lobes symétriques, (ii) vagin armé de petites épines émoussées éparses, (iii) œufs attachés par leurs longs filaments polaires, (vi) œsophage avec plusieurs diverticules latéraux, (v) caeca intestinaux non fusionnés et s’étendant dans le hapteur. Nous présentons une analyse des relations de ce monogène basée sur des séquences partielles d’ADNr 28S. Une clé d’identification des espèces de Neohexostoma est fournie. Ceci est le premier membre du genre Neohexostoma connu pour parasiter une espèce de Gymnosarda.
Key words: Monogenea / Hexostomatidae / New species / Gymnosarda unicolor / the South China Sea
© P.-W. Zhu et al., published by EDP Sciences, 2020
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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