Review of the systematics, morphology and distribution of Asian Clawed Salamanders, genus Onychodactylus (Amphibia, Caudata: Hynobiidae), with the description of four new species

Poyarkov, Nikolay A.; Che, Jing; Min, Mi‐Sook; Kuro-o, Masaki; Fang, Yan; Li, Cheng; Iizuka, Koji; Vieites, David R.

doi:10.11646/zootaxa.3465.1.1

Cited by 37 publications

(37 citation statements)

References 38 publications

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“…The sexual dimorphism of salamanders has attracted considerable interest in evolutionary biology (e.g., Halliday & Arano 1991;Kalezić et al 1992;Andersson 1994;Malmgren & Thollesson 1999;Serra-Cobo et al 2000;Ivanović et al 2008), but few studies have focused on Asian salamanders (Kuzmin 1995;Hasumi 2001Hasumi , 2010Poyarkov et al 2012). …”

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confidence: 99%

Sexual size and shape dimorphism in the Wushan salamander,Liua shihi(Liu, 1950) (Urodela: Hynobiidae)

Zhang

Xiong

et al. 2014

Italian Journal of Zoology

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Sexual dimorphism in size or shape is widespread in the animal world. Many studies have explored this topic, but few have focused on Asian salamanders. In this study, we analyzed morphometric data of the Wushan salamander Liua shihi, an endemic Chinese salamander, to examine sexual dimorphism in size and shape. We evaluated data sets that included 17 morphometric characteristics of 61 females and 55 males using univariate and multivariate methods. Results show that sexual dimorphism in this species includes not only body size (males have a longer snout-vent length than females), but also shape (females have a longer space between axilla and groin and head size than males, while males have greater limb size). This article discusses the evolution of intersexual dimorphism according to models of ecology, fecundity and sexual selection. We propose that sexual dimorphism of body size can be attributed to sexual selection and local climates, that AGS may contribute to fecundity selection, that head size may be attributed to reproductive roles and ecology, and that limb size may be beneficial for reproductive success. However, most aspects of the reproductive biology, ecology and life history of this species remain unknown. This article fills a gap in the literature on this species and builds a foundation for future research. Research on such species is increasingly important as many species of salamander are becoming threatened or endangered throughout the world.

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confidence: 99%

Sexual size and shape dimorphism in the Wushan salamander,Liua shihi(Liu, 1950) (Urodela: Hynobiidae)

Zhang

Xiong

et al. 2014

Italian Journal of Zoology

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“…Korean populations of O. fischeri also have very large eggs (4.9-7.2 mm) and larval development lasts up to three years. However, more recently, molecular taxonomic studies have shown that Korean populations of Onychodactylus belong to a separate species, which is not closely related to O. fischeri (Poyarkov et al, 2012).…”

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Pecularities of bony skeleton development in Asian clawed salamanders (Onychodactylus, Hynobiidae) related to embryonization

Vassilieva

Poyarkov

Iizuka

2013

Biol Bull Russ Acad Sci

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We studied skull, vertebral column, and limb skeleton development in Japanese clawed sala mander Onychodactylus japonicus (Hynobiidae). The study is based on the ontogenetic series of embryos and larvae obtained from wild captured adults by artificial induction of breeding using hormonal stimulation. The first stages of the skeleton formation in O. japonicus are shifted to the late embryonic period and hatching lar vae already possess a well ossified vertebral column, large number of skull ossifications and show signs of ossi fication in the forelimb skeleton. Compared to the primitive pattern of the skeleton development typical for other hynobiid salamanders, O. japonicus shows a number of heterochronies related to embryonization. In particular, this species is characterized by an earlier ossification of the vertebral column compared to that of the skull and by the delayed development and early reduction of the coronoid. Our results, along with the pre viously reported data on the skeleton development in the Fischer's clawed salamander O. fischeri (Smirnov and Vassilieva, 2002), indicate that the genus Onychodactylus is characterized by the loss or reduction of sev eral skeletal features typically found at early larval stages in other Hynobiidae species. In particular, provi sional bones (especially the coronoid) and their dentition are underdeveloped. In addition, it is corroborated that the first tooth generation is absent in Onychodactylus, whereas such monocuspid nonpedicellate tooth generation normally develops at the early larval stages of other caudate amphibians. Since similar patterns of skeleton ontogeny are observed in other caudate groups with different extent of embryonization, it is pro posed that, in different lineages of Urodela, the evolution of ontogeny followed similar pathways and was accompanied by the same changes in skeletogenesis.

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“…Studies of the long-tailed salamander of the genus Onychodactylus showed O. fischeri to occupy the Russian territory only in the central and southern parts of the Sikhote-Alin mountain system (Poyarkov et al, 2012). Therefore, organising a monitoring state of the species in Primorsky Krai is an urgent issue, moreover its population and distribution were assessed for the last time nearly 20 years ago (Maslova, 2001;Kuzmin & Maslova, 2005).…”

Section: Discussionmentioning

confidence: 99%

Distribution of rare and endangered amphibians and reptiles in Primorsky Krai (Far East, Russia)

Maslova¹,

Portnyagina²,

Sokolova³

et al. 2018

Nat. Conserv. Res.

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Information is given on new findings of five rare and endangered species of amphibians and reptiles inhabiting the Primorsky Krai: Onychodactylus fischeri, Pelodiscus maackii, Takydromus wolteri, Oocatochus rufodorsatus and Hebius vibakari. New locations are presented for the studied amphibians and reptiles. For the first time, Onychodactylus fischeri is reported here for the Partizanky Ridge, thus expanding its known habitat range in the southwestern direction. Data on Takydromus wolteri, Oocatochus rufodorsatus and Hebius vibakari findings in western Primorsky Krai are provided for the first time. Habitat borders of Takydromus wolteri in the northern part of its distribution has been updated in various directions: to the west (Khankaysky District), north (Krasnoarmeysky District) and northeast (Olginsky District). The current model of habitat range and breeding places of Khankaysky population of Pelodiscus maackii has been demonstrated, taking into account submerging sandy spits on the western coast of Lake Khanka in 2014-2017. Rivers flowing into Khanka from the western site were shown to play an important role for inhabitance and reproduction of this species. Detailed information on distribution of Hebius vibakari in Primorsky Krai is given for the first time. This species is indicated to be common and sometimes numerous in the south and central parts of Primorsky Krai. The current state of this species' population was researched at locations indicated previously in the references. Some Protected Areas were analysed in the way they protect rare species of the Far Eastern herpetofauna. Hebius vibakari occurs consistently in the Ussuriysky State Nature Reserve, Kedrovaya Pad State Nature Reserve and Land of the Leopard National Park. Within their borders, the Bikin National Park and Udegeyskaya Legenda National Park are shown to have no effect on conserving populations of Pelodiscus maackii and Oocatochus rufodorsatus inhabiting basins of the River Bikin and River Bolshaya Ussurka. Their populations are distributed to the west of the national parks. Organising new Protected Areas is urgent for the Primorsky Krai in its western part (River Komissarovka basin) and in its southeastern part (Livadiysky Ridge).

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Review of the systematics, morphology and distribution of Asian Clawed Salamanders, genus Onychodactylus (Amphibia, Caudata: Hynobiidae), with the description of four new species

Cited by 37 publications

References 38 publications

Sexual size and shape dimorphism in the Wushan salamander,Liua shihi(Liu, 1950) (Urodela: Hynobiidae)

Sexual size and shape dimorphism in the Wushan salamander,Liua shihi(Liu, 1950) (Urodela: Hynobiidae)

Pecularities of bony skeleton development in Asian clawed salamanders (Onychodactylus, Hynobiidae) related to embryonization

Distribution of rare and endangered amphibians and reptiles in Primorsky Krai (Far East, Russia)

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