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Purpose <p>The present study provides an integrative redescription of <i>Sprostoniella micrancyra</i> Cezar, Luque and Amato, 1999 (Monopisthocotylea: Capsalidae), a parasite of the Atlantic spadefish, <i>Chaetodipterus faber</i> (Broussonet, 1782) (Actinopterygii: Ephippidae) off the southeastern Brazilian coast. An additional specimen of <i>Sprostoniella lamothei</i> Pérez-Ponce de Léon and Mendoza-Garfias, 2000 collected from <i>Parapsettus panamensis</i> (Steindachner, 1876) in Peru was included for comparative molecular assessments.</p> Methods <p><i>S. micrancyra</i> specimens were examined using light microscopy, histology, and scanning electron microscopy, with morphological preparations carried out following standard processing protocols. Genomic DNA was extracted from both <i>Sprostoniella</i> species, and partial sequences of the 28S rDNA and mitochondrial <i>cox</i>1 genes were generated. Phylogenetic relationships were inferred using Maximum Likelihood and Bayesian inference.</p> Results <p>Morphological observations of <i>S</i>. <i>micrancyra</i> revealed several previously unreported features, including the presence of a pair of accessory haptoral sclerites, a pair of anchors, a haptor with one central loculus, and the absence of a vaginal opening, contrasting with the original description. Scanning electron microscopy confirmed haptoral organization and detailed the structure of adhesive discs and peduncle musculature, while histology elucidated the organization of reproductive and attachment structures and muscular systems. Phylogenetic analyses of ribosomal and mitochondrial markers recovered the two <i>Sprostoniella</i> species as a monophyletic clade.</p> Conclusion <p>Our results expand current knowledge of <i>S. micrancyra</i> and underscore the importance of integrative approaches to clarify the taxonomy and evolutionary relationships of capsalids.</p>

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Integrative redescription of Sprostoniella micrancyra Cezar, Luque and Amato, 1999 (Monopisthocotylea: Capsalidae) and the phylogenetic position of Sprostoniella Bychowsky and Nagibina, 1967

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  • 发表日期：

    2026年5月25日

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  • Arthur Bessi Machado,
  • Raquel de Oliveira Simões,
  • Jhon Darly Chero,
  • Arnaldo Maldonado Junior,
  • Marcos Antonio José dos Santos,
  • José Luis Luque

摘要

Purpose

The present study provides an integrative redescription of Sprostoniella micrancyra Cezar, Luque and Amato, 1999 (Monopisthocotylea: Capsalidae), a parasite of the Atlantic spadefish, Chaetodipterus faber (Broussonet, 1782) (Actinopterygii: Ephippidae) off the southeastern Brazilian coast. An additional specimen of Sprostoniella lamothei Pérez-Ponce de Léon and Mendoza-Garfias, 2000 collected from Parapsettus panamensis (Steindachner, 1876) in Peru was included for comparative molecular assessments.

Methods

S. micrancyra specimens were examined using light microscopy, histology, and scanning electron microscopy, with morphological preparations carried out following standard processing protocols. Genomic DNA was extracted from both Sprostoniella species, and partial sequences of the 28S rDNA and mitochondrial cox1 genes were generated. Phylogenetic relationships were inferred using Maximum Likelihood and Bayesian inference.

Results

Morphological observations of S. micrancyra revealed several previously unreported features, including the presence of a pair of accessory haptoral sclerites, a pair of anchors, a haptor with one central loculus, and the absence of a vaginal opening, contrasting with the original description. Scanning electron microscopy confirmed haptoral organization and detailed the structure of adhesive discs and peduncle musculature, while histology elucidated the organization of reproductive and attachment structures and muscular systems. Phylogenetic analyses of ribosomal and mitochondrial markers recovered the two Sprostoniella species as a monophyletic clade.

Conclusion

Our results expand current knowledge of S. micrancyra and underscore the importance of integrative approaches to clarify the taxonomy and evolutionary relationships of capsalids.