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

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...

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Bibliographic Details
Published in:Systematic parasitology 2024-02, Vol.101 (1), p.6-6, Article 6
Main Authors: Couto, João Victor, Nunes, Jorge Luiz Silva, Rincon, Getulio, Paschoal, Fabiano, Pereira, Felipe Bisaggio
Format: Article
Language:English
Subjects:
Abdomen
Actinopterygii
Agriculture
Animal Anatomy
Animal Ecology
Animal Systematics/Taxonomy/Biogeography
Animals
Biomedical and Life Sciences
Brazil
Congeners
Copepoda
Ergasilidae
Ergasilus
Females
Fish
Fish Diseases - parasitology
Fishes
Gills
Habitus
Histology
Life Sciences
Morphology
New species
Species Specificity
Spinules
Sternopygidae
Sternopygus macrurus
Zoology
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Summary: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.
ISSN:0165-5752
1573-5192
DOI:10.1007/s11230-023-10133-0