Using combined morphological, allometric and molecular approaches to identify species of the genus Raillietiella (Pentastomida).

Détails

Ressource 1Télécharger: BIB_87ABBD9583C2.P001.pdf (2732.71 [Ko])
Etat: Serval
Version: de l'auteur
ID Serval
serval:BIB_87ABBD9583C2
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Using combined morphological, allometric and molecular approaches to identify species of the genus Raillietiella (Pentastomida).
Périodique
PLoS One
Auteur(s)
Kelehear C., Spratt D.M., Dubey S., Brown G.P., Shine R.
ISSN
1932-6203 (Electronic)
ISSN-L
1932-6203
Statut éditorial
Publié
Date de publication
2011
Volume
6
Numéro
9
Pages
e24936
Langue
anglais
Résumé
Taxonomic studies of parasites can be severely compromised if the host species affects parasite morphology; an uncritical analysis might recognize multiple taxa simply because of phenotypically plastic responses of parasite morphology to host physiology. Pentastomids of the genus Raillietiella are endoparasitic crustaceans primarily infecting the respiratory system of carnivorous reptiles, but also recorded from bufonid anurans. The delineation of pentastomids at the generic level is clear, but the taxonomic status of many species is not. We collected raillietiellids from lungs of the invasive cane toad (Rhinella marina), the invasive Asian house gecko (Hemidactylus frenatus), and a native tree frog (Litoria caerulea) in tropical Australia, and employed a combination of genetic analyses, and traditional and novel morphological methods to clarify their identity. Conventional analyses of parasite morphology (which focus on raw values of morphological traits) revealed two discrete clusters in terms of pentastome hook size, implying two different species of pentastomes: one from toads and a tree frog (Raillietiella indica) and another from lizards (Raillietiella frenatus). However, these clusters disappeared in allometric analyses that took pentastome body size into account, suggesting that only a single pentastome taxon may be involved. Our molecular data revealed no genetic differences between parasites in toads versus lizards, confirming that there was only one species: R. frenatus. This pentastome (previously known only from lizards) clearly is also capable of maturing in anurans. Our analyses show that the morphological features used in pentastomid taxonomy change as the parasite transitions through developmental stages in the definitive host. To facilitate valid descriptions of new species of pentastomes, future taxonomic work should include both morphological measurements (incorporating quantitative measures of body size and hook bluntness) and molecular data.
Mots-clé
Animals, Host-Pathogen Interactions, Lizards/genetics, Lizards/parasitology, Parasitic Diseases, Animal/genetics, Parasitic Diseases, Animal/parasitology, Pentastomida/physiology, Ranidae/genetics, Ranidae/parasitology
Pubmed
Open Access
Oui
Création de la notice
18/10/2011 13:24
Dernière modification de la notice
08/05/2019 21:30
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