Torquenema n. g., Wallabicola n. g., and Macropostrongyloides phascolomys n. sp.: New Genera and a New Species of Nematode (Strongylida: Phascolostrongylinae) Parasitic in Australian Macropodid and Vombatid Marsupials

Sukee, Tanapan; Beveridge, Ian; Jabbar, Abdul

doi:10.3390/ani11010175

Cited by 3 publications

(4 citation statements)

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“…Analyses of both the current mitochondrial and previous ITS data sets placed Torquenema external to the clade comprising Macropostrongyloides , but with low branch support. Although Torquenema can be clearly distinguished from Macropostrongyloides by its occurrence in the stomach of its host and its prominent cervical collar, they share some common features, including a Y-shaped ovejector and small peri-oral denticles [ 10 , 35 ]. Mitochondrial and ITS data support the separation of Torquenema from its previous position within Paramacropostrongylus .…”

Section: Discussionmentioning

confidence: 99%

“…In a recent study, two species ( Macropostrongyloides dissimilis and Paramacropostrongylus toraliformis ) were found to be divergent from their congeners using ITS markers [ 9 ]. Subsequently, morphological examination of these nematodes led to the description of two new genera, namely Wallabicola dissimilis (formerly M. dissimilis ) from the swamp wallaby, Wallabiocola bicolor and Torquenema toraliforme (formerly P. toraliformis ) from the eastern grey kangaroo Macropus giganteus [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

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Phylogenetic relationships of the nematode subfamily Phascolostrongylinae from macropodid and vombatid marsupials inferred using mitochondrial protein sequence data

et al. 2021

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Background The subfamily Phascolostrongylinae (Superfamily Strongyloidea) comprises nematodes that are parasitic in the gastrointestinal tracts of macropodid (Family Macropodidae) and vombatid (Family Vombatidae) marsupials. Currently, nine genera and 20 species have been attributed to the subfamily Phascolostrongylinae. Previous studies using sequence data sets for the internal transcribed spacers (ITS) of nuclear ribosomal DNA showed conflicting topologies between the Phascolostrongylinae and related subfamilies. Therefore, the aim of this study was to validate the phylogenetic relationships within the Phascolostrongylinae and its relationship with the families Chabertiidae and Strongylidae using mitochondrial amino acid sequences. Methods The sequences of all 12 mitochondrial protein-coding genes were obtained by next-generation sequencing of individual adult nematodes (n = 8) representing members of the Phascolostrongylinae. These sequences were conceptually translated and the phylogenetic relationships within the Phascolostrongylinae and its relationship with the families Chabertiidae and Strongylidae were inferred from aligned, concatenated amino acid sequence data sets. Results Within the Phascolostrongylinae, the wombat-specific genera grouped separately from the genera occurring in macropods. Two of the phascolostrongyline tribes were monophyletic, including Phascolostrongylinea and Hypodontinea, whereas the tribe Macropostrongyloidinea was paraphyletic. The tribe Phascolostrongylinea occurring in wombats was closely related to Oesophagostomum spp., also from the family Chabertiidae, which formed a sister relationship with the Phascolostrongylinae. Conclusion The current phylogenetic relationship within the subfamily Phascolostrongylinae supports findings from a previous study based on ITS sequence data. This study contributes also to the understanding of the phylogenetic position of the subfamily Phascolostrongylinae within the Chabertiidae. Future studies investigating the relationships between the Phascolostrongylinae and Cloacininae from macropodid marsupials may advance our knowledge of the phylogeny of strongyloid nematodes in marsupials. Graphical Abstract

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Phylogenetic relationships of the nematode subfamily Phascolostrongylinae from macropodid and vombatid marsupials inferred using mitochondrial protein sequence data

et al. 2021

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“…However, these features, apart from the dorsal gutter, do not consistently differentiate the Cloacininae from the Phascolostrongylinae. For instance, Wallabicola dissimilis from the subfamily Phascolostrongylinae possesses a J-shaped ovejector [ 25 ], which is characteristic of the Cloacininae, whereas the remaining genera of the Phascolostrongylinae possess a Y-shaped ovejector, or a slight variation to it [ 2 ]. The externo-dorsal rays usually originate from the dorsal trunk in the Phascolostrongylinae and from the lateral trunk in the Cloacininae.…”

Section: Discussionmentioning

confidence: 99%

“…There are, however, two species of Cloacina (Cloacininae) from the banded-hare wallaby, Lagostrophus fasciatus, in which the externo-dorsal ray arises from the dorsal ray [ 26 ]. Recently, Sukee et al [ 25 ] pointed out that the shape of the deirid is a reliable character for differentiating the Cloacininae from the Phascolostrongylinae since it is consistently elongate and setiform in the former compared to short and papillate in the latter. Although this feature could be considered taxonomically important and used in future, additional morphological features would facilitate the differentiation between the Cloacininae and the Phascolostrongylinae.…”

Section: Discussionmentioning

confidence: 99%

Phylogenetic Relationships of the Strongyloid Nematodes of Australasian Marsupials Based on Mitochondrial Protein Sequences

Sukee

Beveridge

Koehler

et al. 2022

Animals

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Australasian marsupials harbour a diverse group of gastrointestinal strongyloid nematodes. These nematodes are currently grouped into two subfamilies, namely the Cloacininae and Phascolostrongylinae. Based on morphological criteria, the Cloacininae and Phascolostrongylinae were defined as monophyletic and placed in the family Cloacinidae, but this has not been supported by molecular data and they are currently placed in the Chabertiidae. Although molecular data (internal transcribed spacers of the nuclear ribosomal RNA genes or mitochondrial protein-coding genes) have been used to verify morphological classifications within the Cloacininae and Phascolostrongylinae, the phylogenetic relationships between the subfamilies have not been rigorously tested. This study determined the phylogenetic relationships of the subfamilies Cloacininae and Phascolostrongylinae using amino acid sequences conceptually translated from the twelve concatenated mitochondrial protein-coding genes. The findings demonstrated that the Cloacininae and Phascolostrongylinae formed a well-supported monophyletic assemblage, consistent with their morphological classification as an independent family, Cloacinidae. Unexpectedly, however, the subfamily Phascolostrongylinae was split into two groups comprising the genera from macropodid hosts (kangaroos and wallabies) and those from vombatid hosts (wombats). Genera of the Cloacininae and Phascolostrongylinae occurring in macropodid hosts were more closely related compared to genera of the Phascolostrongylinae occurring in wombats that formed a sister relationship with the remaining genera from macropods. These findings provide molecular evidence supporting the monophyly of the family Cloacinidae and an alternative hypothesis for the origin of marsupial strongyloid nematodes in vombatid hosts that requires further exploration using molecular approaches and additional samples

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Gastrointestinal helminth parasites of the grey kangaroos, Macropus fuliginosus and M. giganteus

Beveridge

2024

Aust. J. Zool.

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The helminth parasites of Macropus fuliginosus and Macropus giganteus are reported based on examination of a total of 285 animals extending, for the first time, across the entire geographical range of both species and including, where possible, data from previous regional studies. A total of 64 species of helminths was found including 42 species of strongyloid nematodes in the stomach, seven species of trichostrongyloid nematodes in the pylorus and small intestine and seven species of nematodes in the terminal ileum and large intestine, one species of spirurid nematode in the stomach and six species of cestodes and one species of trematode. Forty-three species were encountered in both M. fuliginosus and M. giganteus. The helminth communities of the two kangaroo species exhibited a similarity of 85.4% based on all helminth species encountered or 91.4% if only the species specific to grey kangaroos were considered. Interchange of helminths between the two species of kangaroos revealed several different patterns with instances both of transfer and lack of transfer in areas of host sympatry as well as transfers beyond the zone of sympatry. The findings are discussed in relationship to the phylogeography of the host species.

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Torquenema n. g., Wallabicola n. g., and Macropostrongyloides phascolomys n. sp.: New Genera and a New Species of Nematode (Strongylida: Phascolostrongylinae) Parasitic in Australian Macropodid and Vombatid Marsupials

Cited by 3 publications

References 11 publications

Phylogenetic relationships of the nematode subfamily Phascolostrongylinae from macropodid and vombatid marsupials inferred using mitochondrial protein sequence data

Phylogenetic relationships of the nematode subfamily Phascolostrongylinae from macropodid and vombatid marsupials inferred using mitochondrial protein sequence data

Phylogenetic Relationships of the Strongyloid Nematodes of Australasian Marsupials Based on Mitochondrial Protein Sequences

Gastrointestinal helminth parasites of the grey kangaroos, Macropus fuliginosus and M. giganteus

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