Ergasilus lyraephorus n. sp. (Copepoda: Cyclopoida: Ergasilidae) parasitic on the Longtail Knifefish Sternopygus macrurus (Bloch & Schneider, 1801) (Actinopterygii: Sternopygidae) from Northeast Brazil.

IF 1 4区医学 Q4 PARASITOLOGY

Systematic Parasitology Pub Date : 2023-12-20 DOI:10.1007/s11230-023-10133-0

João Victor Couto, Jorge Luiz Silva Nunes, Getulio Rincon, Fabiano Paschoal, Felipe Bisaggio Pereira

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Abstract

The cyclopoid family Ergasilidae Burmeister, 1835, is the most common group of parasitic copepods infesting fish in Brazil, and the type-genus Ergasilus von Nordmann, 1832 comprises the highest number of species. During a survey of freshwater fish in Northeast Brazil, a new species of Ergasilus was found on the gills of the Longtail Knifefish Sternopygus macrurus (Bloch & Schneider) (Actinopterygii: Sternopygidae) in the Viana lake system, State of Maranhão. Ergasilus lyraephorus n. sp. can be distinguished from its closest congeners mainly because it has a lyre-shaped ornamentation on the ventral surface of first pedigerous somite, a feature that has never been reported in the family. In addition, the new species differs from closely related congeners by having a maxillule bearing three elements, by the large spinules on the interpodal plates of legs 1, 2 and 3, and by having leg 5 reduced to a single seta of moderate size. The present study is the first report of an ergasilid parasitizing S. macrurus, as well as the first parasitic copepod found on a host belonging to the family Sternopygidae Cope.

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Ergasilus lyraephorus n. sp. (Copepoda: Cyclopoida: Ergasilidae) parasitic on the Longtail Knifefish Sternopygus macrurus (Bloch & Schneider, 1801) (Actinopterygii: Sternopygidae) fromortheast Brazil.

Ergasilidae Burmeister, 1835 年发现的旋毛虫科是巴西鱼类中最常见的寄生桡足类，Ergasilus von Nordmann, 1832 年发现的这一类型属中的物种数量最多。在对巴西东北部淡水鱼进行调查期间，在马拉尼昂州维亚纳湖水系的长尾刀鱼 Sternopygus macrurus (Bloch & Schneider) （翼手目：刀鱼科）的鳃上发现了一种新的 Ergasilus。Ergasilus lyraephorus n. sp.之所以能与其近缘种区分开来，主要是因为它在第一齿节的腹面上有一个琴形的装饰物，这在该科鱼类中从未报道过。此外，该新种与近缘同属种的不同之处还包括：其上小节有三个元素；第 1、2 和 3 足的趾间板上有大刺突；第 5 足退化为中等大小的单个刚毛。本研究首次报道了寄生于马氏栉水母的麦角虫，也是首次发现寄生于栉水母科宿主的桡足类。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Systematic Parasitology 医学-寄生虫学

CiteScore

2.20

自引率

23.10%

发文量

审稿时长

6-12 weeks

期刊介绍： Systematic Parasitology publishes papers on the systematics, taxonomy and nomenclature of the following groups: Nematoda (including plant-parasitic), Monogenea, Digenea, Cestoda, Acanthocephala, Aspidogastrea, Cestodaria, Arthropoda (parasitic copepods, hymenopterans, mites, ticks, etc.), Protozoa (parasitic groups), and parasitic genera in other groups, such as Mollusca, Turbelleria, etc. Systematic Parasitology publishes fully illustrated research papers, brief communications, and fully illustrated major revisions. In order to maintain high standards, all contributors describing new taxa are asked to state clearly where the holotype is deposited and to make paratypes available for examination by the referees. It is recognized that, in some cases, this may cause problems for the authors, but it is hoped that by adhering to this rule authors may be protected against rapid synonymy of their taxa, and the types will be preserved for posterity.