The taxonomic status of Skrjabinalius guevarai Gallego &amp; Selva, 1979 (Nematoda: Pseudaliidae) and the synonymy of Skrjabinalius Delyamure, 1942 and Halocercus Baylis &amp; Daubney, 1925

Pool, Rachel; Fernández, Mercedes; Chandradeva, Nilani; Raga, Juan Antonio; Aznar, Francisco

doi:10.1007/s11230-020-09921-9

Cited by 9 publications

(8 citation statements)

References 18 publications

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“…Nucleotide sequences from both strands were used to assemble consensus sequences with Geneious R7 ( https://www.geneious.com ). The sequences of H. delphini from D. delphis and S. coeruleoalba were previously published in Pool et al [ 20 ].…”

Section: Methodsmentioning

confidence: 99%

“…Sequences were aligned using MAFFT [ 21 ] with published GenBank sequences for the Pseudaliidae, with Heligmosomum mixtum Schulz, 1929, and Hovorkonema variegatum Creplin, 1849, being designated as outgroups (see [ 20 ], Table 1 ). The resulting alignment was edited to cut significant gaps using the heuristic method in trimAl v1.2 [ 22 ] and then analysed using maximum likelihood (ML) and Bayesian inference (BI) methods.…”

Section: Methodsmentioning

confidence: 99%

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Determinants of lungworm specificity in five cetacean species in the western Mediterranean

et al. 2021

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Background Current data about Pseudaliidae show contrasting patterns of host specificity between congeneric species. We investigated how both contact and compatibility between hosts and parasites contributed to the patterns of lungworm infection observed in a community of five species of cetaceans in the western Mediterranean. Methods The lungs of 119 striped dolphins Stenella coeruleoalba, 18 bottlenose dolphins Tursiops truncatus, 7 Risso’s dolphins Grampus griseus, 7 long-finned pilot whales Globicephala melas, and 6 common dolphins Delphinus delphis were analysed for lungworms. Parasites were identified by morphology and analysis of ITS2 sequences using both maximum likelihood and Bayesian inference methods. Body length was used as a proxy for lungworm species fitness in different hosts and compared with Kruskal-Wallis tests. Infection parameters were compared between cetacean species using Fisher’s exact tests and Kruskal-Wallis tests. Phylogenetic specificity was explored by collating the overall lungworm species prevalence values in hosts from previous surveys in various localities. To explore the relative importance of vertical and horizontal transmission, Spearman’s rank correlation was used to look for an association between host size and lungworm burden. A Mantel test was used to explore the association between lungworm species similarity and prey overlap using dietary data. Results Halocercus delphini had higher infection levels in striped dolphins and common dolphins; Stenurus ovatus had higher infection levels in bottlenose dolphins; and Stenurus globicephalae had higher infection levels in long-finned pilot whales. These results are congruent with findings on a global scale. Morphometric comparison showed that the larger nematodes were found in the same host species that had the highest parasite burden. Lungworms were found in neonatal striped dolphins and a Risso’s dolphin, and there was a weak but significant correlation between host size and parasite burden in striped dolphins and bottlenose dolphins. There was also a weak but significant association between prey overlap and lungworm species similarity. Conclusions Data indicate that phylogenetic specificity has an important role in governing host–parasite associations, as indicated by the higher infection levels and larger nematode size in certain hosts. However, diet can also influence infection patterns in these preferred hosts and contribute to less severe infections in other hosts.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Determinants of lungworm specificity in five cetacean species in the western Mediterranean

et al. 2021

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“…A single ITS2 partial sequence was obtained from 1 out of 10 isolates identified based on morphology as Halocercus sp. The ML analysis of the ITS2 dataset (7 taxa; 11 sequences; 699 nt; Supplementary Table 1C) produced a tree topology (Figure 5A) consistent with that in Pool et al (2020). The newly generated sequence for lungworm nematode falls into a well-supported clade together with isolates identified as Halocercus delphini.…”

Section: Molecular Identification Of Metazoan Parasitesmentioning

confidence: 58%

“…Newly generated sequences of each parasitic taxa were aligned independently with representative sequences for taxa of the same or proximal families (see Supplementary Table 1). The outgroup of each dataset was selected following previous analyses on the phylogeny of each parasitic taxa (e.g., Carreno and Nadler, 2003;Caira et al, 2020;Pool et al, 2020;García-Varela et al, 2021). Sequences included in each dataset were aligned with the MAFFT algorithm (Katoh and Standley, 2013) implemented in Geneious.…”

Section: Molecular Data and Phylogenetic Analyses Of Parasitesmentioning

confidence: 99%

A Visitor of Tropical Waters: First Record of a Clymene Dolphin (Stenella clymene) Off the Patagonian Coast of Argentina, With Comments on Diet and Metazoan Parasites

et al. 2021

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The poorly known Clymene dolphin (Stenella clymene) is a small oceanic cetacean distributed in tropical and subtropical waters of the Atlantic Ocean. In this study, we report, for the first time, a vagrant individual of Clymene dolphin in Argentina (Rada Tilly) that represents the current southern-most record for this cetacean species. We provide a molecular identification of the dolphin, based on partial sequences of the mitochondrial cytochrome b gene, generated from DNA extracted from its metazoan parasites. Three prey species, namely Argentine hake, Patagonian squid and lobster krill were identified from hard pieces collected in the stomach. Seven metazoan parasite taxa (three in adult stage, one immature stage and three in larval stage) were identified using morphological and molecular data, i.e., the digenean Pholeter gastrophilus (new host record), the cestodes Tetrabothrius (Tetrabothrius) forsteri, Clistobothrium grimaldii unidentified phyllobothriid plerocercoids, the nematodes Anisakis pegreffii (new host record), Halocercus delphini and the acanthocephalan Corynosoma australe (new host record). Our study provides the first molecular exploration of the metazoan parasite diversity in delphinids from the southwestern Atlantic, and contributes significantly to understand the poorly known parasite fauna of the Clymene dolphin.

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“…The Pseudaliidae are a family of metastrongyloid lungworms that infect the lungs or cranial sinuses of cetaceans worldwide ( Measures, 2001 ; Anderson et al, 2009 ; Fraija-Fernández et al, 2016 ), except for Stenuroides herpestis , which is found in the lungs of the Egyptian mongoose, Herpestis ichneumon ( Gerichter, 1951 ; Blanco et al, 1993 ). Three sub-families, 6 genera and 31 species are currently recognised within this family ( Delyamure 1955 ; Measures, 2001 ; Fraija-Fernández et al, 2016 ; Pool et al, 2020b ): the Pseudaliinae Railliet and Henry, 1909, with the genus Pseudalius Railliet and Henry, 1909 (1 sp. ); the Halocercinae Delyamure, 1955 , with the genus Halocercus Baylis and Daubney, 1925 (13 spp.…”

Section: Introductionmentioning

confidence: 99%

Molecular phylogeny of the Pseudaliidae (Nematoda) and the origin of associations between lungworms and marine mammals

Pool

Shiozaki

Raga

et al. 2023

International Journal for Parasitology: Parasites and Wildlife

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The taxonomic status of Skrjabinalius guevarai Gallego & Selva, 1979 (Nematoda: Pseudaliidae) and the synonymy of Skrjabinalius Delyamure, 1942 and Halocercus Baylis & Daubney, 1925

Cited by 9 publications

References 18 publications

Determinants of lungworm specificity in five cetacean species in the western Mediterranean

Determinants of lungworm specificity in five cetacean species in the western Mediterranean

A Visitor of Tropical Waters: First Record of a Clymene Dolphin (Stenella clymene) Off the Patagonian Coast of Argentina, With Comments on Diet and Metazoan Parasites

Molecular phylogeny of the Pseudaliidae (Nematoda) and the origin of associations between lungworms and marine mammals

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