Integrative taxonomy unveils a new species of <i>Dugesia</i> (Platyhelminthes, Tricladida, Dugesiidae) from the southern portion of the Taihang Mountains in northern China, with the description of its complete mitogenome and an exploratory analysis of mitochondrial gene order as a taxonomic character

Wang, Lei; Wang, Yixuan; Dong, Zimei; Chen, Guangwen; Sluys, Ronald; Liu, Dezeng

doi:10.1111/1749-4877.12605

Cited by 9 publications

(7 citation statements)

References 54 publications

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“…The Australasian and Oriental clade is formed by three major branches that basically coincide with the topology of the trees of Song et al (2020: figs 1, S2, S3) and Wang et al (2021aWang et al ( , 2021bWang et al ( , 2022. However, in the trees of Wang et al (2021aWang et al ( , 2021bWang et al ( , 2022 2020), i.e., complete mitochondrial genome (AB618487), while only a partial mitochondrial sequence (FJ646990) was used in Wang et al (2021aWang et al ( , b, 2022.…”

Section: Discussionsupporting

confidence: 52%

“…receives only low support in our phylogenetic tree (0.60 pp; 70% bs), whereas this clade is robust in the trees ofSong et al (2020: fig. 1; 0.99 pp; 92% bs) andWang et al (2021aWang et al ( , 2021bWang et al ( , 2022: figs 2; 1.00 pp; 81% bs; 1.00 pp; 95% bs; 1.00 pp; 74% bs, respectively).Inour phylogenetic tree, a large clade comprising species from Cameroon, Western Palearctic, Australasian and Oriental regions is sister to a Madagascan clade, and together cluster with an Afrotropical and South-West Palearctic clade. This topology is the same as in Song et al (2020: fig.…”

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confidence: 98%

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Addition to the known diversity of Chinese freshwater planarians: integrative description of a new species of Dugesia Girard, 1850 (Platyhelminthes, Tricladida, Dugesiidae)

Liu

Song

Sun

et al. 2022

ZSE

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The present paper describes a new species of freshwater flatworm of the genus Dugesia from Guizhou province, China, based on an integrative approach, combining morphological, histological and molecular information. This new species, Dugesia gemmulata Sun & Wang, sp. nov., is characterized by the ventral part of the most posterior section of the bursal canal being provided with a voluminous, ellipsoidal muscular swelling; sac- or egg-shaped seminal vesicle situated near the ventral body surface in anterior portion of the penis bulb; postero-dorsal wall of seminal vesicle communicating with a narrow duct that first runs almost vertically but then shows a postero-dorsally directed loop before connecting with a small diaphragm; an ejaculatory duct opening terminally or subterminally; an asymmetrical penis papilla, with its dorsal lip being provided with a bump; oviducts opening asymmetrically into female copulatory apparatus, with the left oviduct opening into the common atrium and the right oviduct opening into the vaginal section of the bursal canal. Molecular phylogenetic analyses revealed that the new species belongs to a clade comprising species from the Australasian and Oriental regions, while it shares a sister-group relationship with D. umbonata Song & Wang, 2020, a species characterized by a muscular swelling on the dorsal side of its bursal canal.

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Section: Discussionsupporting

confidence: 52%

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confidence: 98%

Addition to the known diversity of Chinese freshwater planarians: integrative description of a new species of Dugesia Girard, 1850 (Platyhelminthes, Tricladida, Dugesiidae)

Liu

Song

Sun

et al. 2022

ZSE

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“…1 ; e.g. [ 2 , 11 , 31 ]). The separate species status of D. adunca and D. tumida are supported by their separate branches receiving high support values in the phylogenetic trees (pp = 1.00 & bs = 86, pp = 1.00 & bs = 80, respectively; Fig.…”

Section: Discussionmentioning

confidence: 99%

Two new species of Dugesia (Platyhelminthes, Tricladida, Dugesiidae) from the subtropical monsoon region in Southern China, with a discussion on reproductive modalities

Chen¹,

Wang²,

Wu³

et al. 2022

BMC Zool

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Background Freshwater planarians of the genus Dugesia (Platyhelminthes, Tricladida, Dugesiidae) are distributed in a major part of the Old World and Australia, although until recently only very few species were known from China. Results Two new species of Dugesia from Southern China are described on the basis of an integrative taxonomic approach. BI and ML phylogenetic trees based on the independent genes and on the concatenated dataset had similar topologies, only differing in some nodes that were weakly supported. Phylogenetic trees based on the concatenated dataset revealed that D. adunca Chen & Sluys, sp. nov. and D. tumida Chen & Sluys, sp. nov. are not closely related and belong to different clades. The two new species occupy separate long branches with high support values and, thus, are well-differentiated from their congeners. Separate species status of D. adunca and D. tumida is supported also by the genetic distances between the species included in our analysis, albeit that COI distances varied greatly among species. Dugesia adunca from Guangxi Province is characterized by the following features: living mature animals rather small; asymmetrical openings of the oviducts into the bursal canal; penis papilla with shape of an aquiline bill, albeit with a blunt tip; asymmetrical penis papilla, with a large antero-dorsal lip and a much smaller ventro-posterior lip; very large seminal vesicle, provided with trabeculae; small diaphragm; mixoploid karyotype with diploid complements of 2n = 2x = 16 and triploid complements of 2n = 3x = 24, with all chromosomes being metacentric. Dugesia tumida from Guangdong Province is characterized by a penis papilla provided with a large, symmetrical penial valve from the middle of which arises the small, distal section of the papilla; a duct intercalated between the seminal vesicle and the small diaphragm; ventrally displaced ejaculatory duct curving upwards before opening to the exterior; penis papilla highly asymmetrical, having a slim and long ventral portion and a short and stubby dorsal part; vasa deferentia separately opening into antero-dorsal portion of seminal vesicle; oviducts openings symmetrically into ventral portion of the bursal canal, near its opening into the atrium; mixoploid karyotype, with diploid chromosome portraits of 2n = 2x = 16, and triploid complements of 2n = 3x = 24, with all chromosomes being metacentric. In the context of the various kinds of mixoploidy and the sexualization of specimens, reproductive modalities within the genus Dugesia are shortly discussed. Conclusion Molecular, morphological, and karyological markers show that the two populations examined represent members of the genus Dugesia and constitute two new, distinct species.

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“…The dataset previously used to infer a phylogeny of the Geoplanidae 31 , 54 based on 21 mitogenome-encoded proteins was appended with the five new species examined here plus the recently described Dugesia constrictiva Chen & Dong, sp. nov. 95 . The amino-acid sequences of the individual proteins were first aligned using MAFFT 7 96 and trimmed with the -automated1 option of trimAl 97 ; then, the different protein alignments were concatenated using Phyutility 2.7.1 98 .…”

Section: Methodsmentioning

confidence: 99%

The invasive land flatworm Arthurdendyus triangulatus has repeated sequences in the mitogenome, extra-long cox2 gene and paralogous nuclear rRNA clusters

Gastineau,

Lemieux,

Turmel

et al. 2024

Sci Rep

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Using a combination of short- and long-reads sequencing, we were able to sequence the complete mitochondrial genome of the invasive ‘New Zealand flatworm’ Arthurdendyus triangulatus (Geoplanidae, Rhynchodeminae, Caenoplanini) and its two complete paralogous nuclear rRNA gene clusters. The mitogenome has a total length of 20,309 bp and contains repetitions that includes two types of tandem-repeats that could not be solved by short-reads sequencing. We also sequenced for the first time the mitogenomes of four species of Caenoplana (Caenoplanini). A maximum likelihood phylogeny associated A. triangulatus with the other Caenoplanini but Parakontikia ventrolineata and Australopacifica atrata were rejected from the Caenoplanini and associated instead with the Rhynchodemini, with Platydemus manokwari. It was found that the mitogenomes of all species of the subfamily Rhynchodeminae share several unusual structural features, including a very long cox2 gene. This is the first time that the complete paralogous rRNA clusters, which differ in length, sequence and seemingly number of copies, were obtained for a Geoplanidae.

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Integrative taxonomy unveils a new species of Dugesia (Platyhelminthes, Tricladida, Dugesiidae) from the southern portion of the Taihang Mountains in northern China, with the description of its complete mitogenome and an exploratory analysis of mitochondrial gene order as a taxonomic character

Cited by 9 publications

References 54 publications

Addition to the known diversity of Chinese freshwater planarians: integrative description of a new species of Dugesia Girard, 1850 (Platyhelminthes, Tricladida, Dugesiidae)

Addition to the known diversity of Chinese freshwater planarians: integrative description of a new species of Dugesia Girard, 1850 (Platyhelminthes, Tricladida, Dugesiidae)

Two new species of Dugesia (Platyhelminthes, Tricladida, Dugesiidae) from the subtropical monsoon region in Southern China, with a discussion on reproductive modalities

The invasive land flatworm Arthurdendyus triangulatus has repeated sequences in the mitogenome, extra-long cox2 gene and paralogous nuclear rRNA clusters

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