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New perspectives on Aspersentis Megarhynchus (Acanthocephala: Heteracanthocephalidae) from Notothenia Coriiceps Richardson (Nototheniidae) in the West Antarctic, with emended generic diagnosis

Published online by Cambridge University Press:  25 May 2021

O.M. Amin Open the ORCID record for O.M. Amin [Opens in a new window] ,
R.A. Heckmann ,
S. Dallarés ,
M. Constenla ,
N.Yu. Rubtsova  and
T. Kuzmina
O.M. Amin*
Affiliation:
Institute of Parasitic Diseases, 11445 E. Via Linda 2-419, Scottsdale, Arizona85259, USA
R.A. Heckmann
Affiliation:
Department of Biology, Brigham Young University, 1114 MLBM, Provo, Utah84602, USA
S. Dallarés
Affiliation:
Department of Animal Biology, Vegetal Biology and Ecology, Universitat Autònoma de Barcelona, Cerdanyola, Barcelona, Spain
M. Constenla
Affiliation:
Department of Animal Biology, Vegetal Biology and Ecology, Universitat Autònoma de Barcelona, Cerdanyola, Barcelona, Spain
N.Yu. Rubtsova
Affiliation:
Institute of Parasitic Diseases, 11445 E. Via Linda 2-419, Scottsdale, Arizona85259, USA
T. Kuzmina
Affiliation:
I. I. Schmalhausen Institute of Zoology, Bohdana Khmelnytskoho St, 15, Kyiv02000, Ukraine
*
Author for correspondence: O.M. Amin, E-mail: [email protected]
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Abstract

A number of variable descriptive accounts of Aspersentis megarhynchus (von Linstow, 1892) Golvan, 1960 have been reported from specimens collected from many species of fish in various locations off Antarctic islands. We have described a new population from Notothenia coriiceps Richardson (Nototheniidae) off Galindez Island, West Antarctica, and features not previously reported, resolved the taxonomic controversies and nomenclature, and emended and updated the generic diagnosis taking into account the newly observed structures. These are depicted in microscopic images and include the outer spiral wall of the proboscis receptacle, the thicker dorsal wall of the receptacle compared to the ventral wall, parts of the female reproductive system, the separate cement gland ducts, the dorsal position of the male gonopore and more detail of proboscis hooks and trunk spines. It is surprising that the newly observed features were missed from the many descriptions of A. megarhynchus created since the original description. The variability in A. megarhynchus is noted with a comparison of the morphometrics of our specimens vs. those in six other descriptions. We also analysed the metal composition of hooks and spines using energy-dispersive X-ray analysis and concluded a molecular characterization of the species based on 18S DNA gene, with related phylogenetic analyses.

Keywords

AcanthocephalaAspersentis megarhynchusNothothenia coriicepsEDXAmolecular profileWest Antarctic
Type
Research Paper
Information
Journal of Helminthology , Volume 95 , 2021 , e27
Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press

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Footnotes

*

Deceased.

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