Morphological and molecular description of a distinct population of Echinorhynchus gadi Zoega in Müller, 1776 (Paleacanthocephala: Echinorhynchidae) from the pacific halibut Hippoglossus stenolepis Schmidt in Alaska.
Acanthocephala
Alaska
EDXA
Echinorhynchus gadi
Hippoglossus stenolepis
Histopathology
Molecular analysis
New population
Journal
Acta parasitologica
ISSN: 1896-1851
Titre abrégé: Acta Parasitol
Pays: Switzerland
ID NLM: 9301947
Informations de publication
Date de publication:
Sep 2021
Sep 2021
Historique:
received:
05
02
2021
accepted:
24
02
2021
pubmed:
10
3
2021
medline:
1
9
2021
entrez:
9
3
2021
Statut:
ppublish
Résumé
Echinorhynchus gadi is one of the most widely distributed and commonly described acanthocephalans in marine fishes throughout the world. We provide a detailed morphometric and molecular description of a distinct Alaska population collected from the Pacific halibut Hippoglossus stenolepis Schmidt (Pleuronectidae) compared to those from other hosts and regions, illustrating new features never previously reported. We described new specimens by microscopical studies, augmented by SEM, Energy Dispersive x-ray and molecular analyses, and histopathology. Specimens from Alaska were distinguished from those collected from the other geographical areas in proboscis size and its armature, especially number of hook rows and hooks per row, and length of hooks. The size of the receptacle, lemnisci, and reproductive structures in some other collections also varied from the Alaska material. X-ray scans of the gallium cut hooks depict prominent layering with high Sulfur content for tip cuts and increased calcium and phosphorus content in the base area of the hook. Sections of E. gadi specimens in the host tissue show prominent hook entanglement with subsequent connective tissue invasion also depicting the internal anatomy of certain worm structures not readily seen by other means. Molecular analyses clearly confirmed the identity of our E. gadi sequences. Our Alaska population of the E. gadi complex appears to represent a novel population distinguishable by its distinct morphometrics, geography and host species. We further establish new information on the Energy Dispersive X-ray analysis in our Alaska material for future comparisons with the other siblings and explore genetic relationships among echinorhynchid genera and species.
Identifiants
pubmed: 33686523
doi: 10.1007/s11686-021-00361-z
pii: 10.1007/s11686-021-00361-z
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
881-898Informations de copyright
© 2021. Witold Stefański Institute of Parasitology, Polish Academy of Sciences.
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