A new species of Plectognathotrema Layman, 1930 (Trematoda: Zoogonidae) from an Australian monacanthid, with a molecular assessment of the phylogenetic position of the genus

Cutmore, Scott C.; Miller, Terrence L.; Bray, Rodney A.

doi:10.1007/s11230-014-9523-2

Cited by 19 publications

(7 citation statements)

References 29 publications

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“…The species of faustulids nesting within the Gymnophalloidea are Pseudobacciger cheyenae Sun, Bray, Yong, Bacciger astyanactis Lunaschi, 1988 (added to the analysis of the 28S phylogenetic tree). A recent phylogenetic analysis using 28S and ITS DNA sequences has demonstrated that even though P. cheyenae is currently recognized within the Faustulidae, this species is not closely related to the other faustulid genera, such as Antorchis Linton, 1911, Bacciger Nicoll, 1924, Paradiscogaster Yamaguti, 1934and Trigonocryptus Martin, 1958Cutmore et al (2014) demonstrated that these genera are associated with the Zoogonidae in the Microphalloidea; instead, P. cheyenae is nested within Gymnophalloidea as a sister taxa to the Tandanicolidae (Sun et al 2014). Based on these results, the species Bacciger astyanactis must be re-allocated because it does not belong in Bacciger and should probably be included within Pseudobacciger.…”

Section: Journal Of Helminthology 269mentioning

confidence: 98%

“…A recent phylogenetic analysis using 28S and ITS DNA sequences has demonstrated that even though P. cheyenae is currently recognized within the Faustulidae, this species is not closely related to the other faustulid genera, such as Antorchis Linton, 1911, Bacciger Nicoll, 1924, Paradiscogaster Yamaguti, 1934 and Trigonocryptus Martin, 1958; Cutmore et al . (2014) demonstrated that these genera are associated with the Zoogonidae in the Microphalloidea; instead, P. cheyenae is nested within Gymnophalloidea as a sister taxa to the Tandanicolidae (Sun et al . 2014).…”

Section: Revisiting the Higher-level Classificationmentioning

confidence: 99%

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Testing the higher-level phylogenetic classification of Digenea (Platyhelminthes, Trematoda) based on nuclear rDNA sequences before entering the age of the ‘next-generation’ Tree of Life

2019

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Digenea Carus, 1863 represent a highly diverse group of parasitic platyhelminths that infect all major vertebrate groups as definitive hosts. Morphology is the cornerstone of digenean systematics, but molecular markers have been instrumental in searching for a stable classification system of the subclass and in establishing more accurate species limits. The first comprehensive molecular phylogenetic tree of Digenea published in 2003 used two nuclear rRNA genes (ssrDNA = 18S rDNA and lsrDNA = 28S rDNA) and was based on 163 taxa representing 77 nominal families, resulting in a widely accepted phylogenetic classification. The genetic library for the 28S rRNA gene has increased steadily over the last 15 years because this marker possesses a strong phylogenetic signal to resolve sister-group relationships among species and to infer phylogenetic relationships at higher levels of the taxonomic hierarchy. Here, we have updated the database of 18S and 28S rRNA genes until December 2017, we have added newly generated 28S rDNA sequences and we have reassessed phylogenetic relationships to test the current higher-level classification of digeneans (at the subordinal and subfamilial levels). The new dataset consisted of 1077 digenean taxa allocated to 106 nominal families for 28S and 419 taxa in 98 families for 18S. Overall, the results were consistent with previous higher-level classification schemes, and most superfamilies and suborders were recovered as monophyletic assemblages. With the advancement of next-generation sequencing (NGS) technologies, new phylogenetic hypotheses from complete mitochondrial genomes have been proposed, although their power to resolve deep levels of trees remains controversial. Since data from NGS methods are replacing other widely used markers for phylogenetic analyses, it is timely to reassess the phylogenetic relationships of digeneans with conventional nuclear rRNA genes, and to use the new analysis to test the performance of genomic information gathered from NGS, e.g. mitogenomes, to infer higher-level relationships of this group of parasitic platyhelminths.

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Section: Journal Of Helminthology 269mentioning

confidence: 98%

Section: Revisiting the Higher-level Classificationmentioning

confidence: 99%

Testing the higher-level phylogenetic classification of Digenea (Platyhelminthes, Trematoda) based on nuclear rDNA sequences before entering the age of the ‘next-generation’ Tree of Life

2019

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“…The position of the genus within the family Faustulidae has been confirmed by molecular data, with Antorchis forming a strongly supported clade with species of the faustulid genera Bacciger Nicoll, 1914 andTrigonocryptus Martin, 1958 in the analyses of Olson et al (2003), Sun et al (2014) and Cutmore et al (2014). The analyses of Sun et al (2014) highlighted the possible need for future division of the Faustulidae into two families, one related to the Zoogonidae (the clade to which Antorchis belongs) and one related to the Gymnophalloidea Odhner, 1905.…”

Section: Introductionmentioning

confidence: 75%

A review of the genus Antorchis Linton, 1911 (Trematoda: Faustulidae) from Indo-Pacific fishes with the description of a new species

2015

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Species of the faustulid genus Antorchis Linton, 1911 of the tropical Indo-West Pacific are reviewed. We recognise five species in the region, including a novel form. Antorchis nasonis n. sp. is described from Naso annulatus (Quoy & Gaimard) and N. tonganus (Valenciennes) on the southern Great Barrier Reef (GBR). We interpret specimens reported from Naso hexacanthus (Bleeker) from Japan as the same species. This species appears to be the only faustulid known from acanthurid fishes and differs from all other species in the genus in having the prominent dorsal genital invagination close to the posterior end of the body. In addition, new host and locality records are reported for two described species of Antorchis, A. pomacanthi (Hafeezullah & Siddiqi, 1970) and A. tsushimaensis (Machida, 1971). The wide distribution of A. pomacanthi was further demonstrated by the generation of identical ITS2 rDNA sequences for specimens from Ningaloo Reef off Western Australia, off Lizard and Heron Islands (GBR) and off New Caledonia, localities separated by up to 5,300 km. The host-specificity of the genus is considered.

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“…Remarks: The present specimens belong within the Zoogonidae based on the following diagnostic combination of features: a genital pore in the forebody that is neither median nor close to the anterior extremity or lateral edge of the ventral sucker; a cirrus pouch with proximal extremity oriented posteriorly; an ovary that is entire and in the hindbody; a distinct alimentary tract as opposed to absent or greatly reduced; an ejaculatory duct and metraterm that are unarmed; testes in the hindbody; and a fish host (Bray, 2008a). Unlike members of the Cephaloporinae, Yamaguti, 1934, these specimens lack an unusually posterior ventral sucker, a lateral genital pore close to the level of the oral sucker, and a monacanthid host, yet they possess an operculate egg and vitellaria in paired fields of follicles and not in one or two compact masses (i.e., Zoogoninae Odhner, 1902); therefore, they are placed within the Lepidophyllinae (Bray, 2008b;Cutmore et al, 2014). This material belongs within Steganoderma because of its possessing an elongate oval to fusiform body, more or less entire testes and ovary, narrow ceca that extend to or near the level of the testes, an undivided sessile round ventral sucker with a mid-ventral aperture, vitelline fields in the hindbody, non-filamented eggs, neither enlarged circumoral spines nor pockets in the ejaculatory duct and metraterm, a claviform cirrus pouch, a saccular seminal vesicle (though bipartite, both portions are saccate), and these specimens infect the intestine instead of the urinary bladder of its fish host (Bray, 2008b).…”

Section: Zoobank Registrationmentioning

confidence: 99%

Steganoderma Stafford, 1904 (Digenea: Zoogonidae: Lepidophyllinae) from Two Species of Rockfishes from Deep Waters off Oregon Including a New Species and an Updated Key to Species of This Genus

Blend

Rácz

2020

MANT

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Steganoderma eamiqtrema n. sp. and a single unidentified specimen of Steganoderma Stafford, 1904 (Zoogonidae: Lepidophyllinae) obtained from the intestine of the greenstriped rockfish, Sebastes elongatus Ayres, 1859, and the flag rockfish, Sebastes rubrivinctus (Jordan and Gilbert, 1880) (Scorpaeniformes: Sebastidae), collected from 190–200 m depths off Oregon, USA, are described. The new species is distinguished from its seven other congeners by a diagnostic combination of morphological features including an elongate oval to spindle-shaped body, a clavate to comma-shaped cirrus pouch located in the forebody and hindbody, a bipartite seminal vesicle, a bifurcal or just post-bifurcal genital pore, a larger ventral than oral sucker, and a smooth testes and ovary with a relatively small distance between them. We present an updated key to the eight species now in Steganoderma and provide a list of parasites known from Se. elongatus and Se. rubrivinctus. The discovery of S. eamiqtrema in Se. elongatus represents the second species of zoogonid known from this host, and the finding of Steganoderma sp. in Se. rubrivinctus represents the first report of a digenean from this host species. A detailed discussion also is given of the type species, S. formosum Stafford, 1904, and questions are raised as to whether this species has a worldwide distribution and infects such a wide variety of fish hosts. We present evidence including variation we observed in redescriptions of the type species, query the implausible idea that there could be gene flow between conspecific helminths geographically separated in the North Atlantic and North Pacific Oceans over such a vast geological period, and offer the possibility that some prior reports of S. formosum may, indeed, be S. eamiqtrema; all of which suggests S. formosum sensu lato may be part of a species complex and not the same worldwide species. Steganoderma is represented in the deep sea by S. eamiqtrema, S. formosum, and Steganoderma sp., and limited speculation is given as to the host specificity of this genus and life history strategies of the new species in deeper waters. Finally, molecular studies of species of Steganoderma are sorely needed (i.e., there is no DNA sequence data currently available in GenBank for any species of this genus), and we suspect that with further molecular, morphological, and life history work, this genus will be taxonomically divided up.

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A new species of Plectognathotrema Layman, 1930 (Trematoda: Zoogonidae) from an Australian monacanthid, with a molecular assessment of the phylogenetic position of the genus

Abstract: During helminthological examinations of teleost fishes of Ningaloo

Cited by 19 publications

References 29 publications

Testing the higher-level phylogenetic classification of Digenea (Platyhelminthes, Trematoda) based on nuclear rDNA sequences before entering the age of the ‘next-generation’ Tree of Life

Testing the higher-level phylogenetic classification of Digenea (Platyhelminthes, Trematoda) based on nuclear rDNA sequences before entering the age of the ‘next-generation’ Tree of Life

A review of the genus Antorchis Linton, 1911 (Trematoda: Faustulidae) from Indo-Pacific fishes with the description of a new species

Steganoderma Stafford, 1904 (Digenea: Zoogonidae: Lepidophyllinae) from Two Species of Rockfishes from Deep Waters off Oregon Including a New Species and an Updated Key to Species of This Genus

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