Diagnostic description and geographic distribution of four new cryptic species of the blue-spotted maskray species complex (Myliobatoidei: Dasyatidae; Neotrygon spp.) based on DNA sequences

Borsa, Philippe; Arlyza, Irma S.; Hoareau, Thierry B.; Shen, Kang‐Ning

doi:10.1007/s00343-018-7056-2

“…trigonoides. Base don coloration and CO1 sequence data, this species is most similar to and possibly conspecific with the recently described N. westpapuensis Borsa, Arlyza, Hoareau & Shen, 2017 Local synonymy: Trygon sephen-Peters, 1877: 853 (New Britain); Ogilby, 1888: 20 (southeastern New Guinea); Günther, 1910: 495 (New Britain); Duncker & Mohr, 1934: 84 (Seeadler Harbour, Manus). Taeniura atra Macleay, 1883a: 598 (Port Moresby district).…”

Section: Neotrygon Cf Trigonoides Papuan Maskraysupporting

confidence: 66%

An annotated checklist of the chondrichthyans of Papua New Guinea

White

¹

,

Ko’Ou

²

2018

Zootaxa

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An annotated checklist of the chondrichthyan fishes (sharks, rays, and chimaeras) of Papua New Guinean waters is herein presented. The checklist is the result of a large biodiversity study on the chondrichthyan fauna of Papua New Guinea between 2013 and 2017. The chondrichthyan fauna of Papua New Guinea has historically been very poorly known due to a lack of baseline information and limited deepwater exploration. A total of 131 species, comprising 36 families and 68 genera, were recorded. The most speciose families are the Carcharhinidae with 29 species and the Dasyatidae with 23 species. Verified voucher material from various biological collections around the world are provided, with a total of 687 lots recorded comprising 574 whole specimens, 128 sets of jaws and 21 sawfish rostra. This represents the first detailed, verified checklist of chondrichthyans from Papua New Guinean waters.

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“…In contrast, splitting a cryptic species complex into several species based purely on genetics can cause problems if there are no strong supportive diagnostic characters to differentiate them in the field. An example is in the Neotrygon kuhlii species complex [ 38 , 72 ] where several species are sympatric yet cannot be diagnosed morphologically, which complicates management. Policymakers may find it difficult to implement conservation and management actions, especially if the species are sympatric, inhabit similar ecotypes, or occur in one fishing region.…”

Section: Discussionmentioning

confidence: 99%

Delimiting cryptic species within the brown-banded bamboo shark, Chiloscyllium punctatum in the Indo-Australian region with mitochondrial DNA and genome-wide SNP approaches

Fahmi

¹

,

Tibbetts

²

,

Bennett

³

et al. 2021

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Background Delimiting cryptic species in elasmobranchs is a major challenge in modern taxonomy due the lack of available phenotypic features. Employing stand-alone genetics in splitting a cryptic species may prove problematic for further studies and for implementing conservation management. In this study, we examined mitochondrial DNA and genome-wide nuclear single nucleotide polymorphisms (SNPs) in the brown-banded bambooshark, Chiloscyllium punctatum to evaluate potential cryptic species and the species-population boundary in the group. Results Both mtDNA and SNP analyses showed potential delimitation within C. punctatum from the Indo-Australian region and consisted of four operational taxonomic units (OTUs), i.e. those from Indo-Malay region, the west coast of Sumatra, Lesser Sunda region, and the Australian region. Each OTU can be interpreted differently depending on available supporting information, either based on biological, ecological or geographical data. We found that SNP data provided more robust results than mtDNA data in determining the boundary between population and cryptic species. Conclusion To split a cryptic species complex and erect new species based purely on the results of genetic analyses is not recommended. The designation of new species needs supportive diagnostic morphological characters that allow for species recognition, as an inability to recognise individuals in the field creates difficulties for future research, management for conservation and fisheries purposes. Moreover, we recommend that future studies use a comprehensive sampling regime that encompasses the full range of a species complex. This approach would increase the likelihood of identification of operational taxonomic units rather than resulting in an incorrect designation of new species.

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“…For instance, due to the intensive trawl operations in the Indo-Malay region (26,67) In contrast, splitting a cryptic species complex into several species based purely on genetics can cause problems if there are no strong supportive diagnostic characters to differentiate them in the eld. An example is in the Neotrygon kuhlii species complex (38,68) where several species are sympatric yet cannot be diagnosed morphologically, which complicates management. Policymakers may nd it di cult to implement conservation and management actions, especially if the species are sympatric, inhabit similar ecotypes, or occur in one shing region.…”

Section: Conservation Implications Of the Species Delimitationmentioning

confidence: 99%

Delimiting cryptic species in a shark with a low dispersal capability

Fahmi

¹

,

Tibbetts

²

,

Bennett

³

et al. 2020

Preprint

2

0

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BackgroundDelimiting cryptic species in elasmobranchs is a major challenge in modern taxonomy due the lack of available phenotypic features. Employing stand-alone genetics in splitting a cryptic species may prove problematic for further studies and for implementing conservation management. In this study, we examined mitochondrial DNA and genome-wide nuclear single nucleotide polymorphisms (SNPs) in the brown-banded bambooshark, Chiloscyllium punctatum to evaluate potential cryptic species and the species-population boundary in the group.ResultsOur results found four operational taxonomic units (OTUs) within C. punctatum from the Indo-Australian region. Each OTU can be interpreted differently depending on available supporting information. Similarly, we confirmed that comprehensive sampling over the species' geographic distribution was essential to determine the boundary between population and cryptic species.ConclusionWe provide suggestions about what should be considered prior to split cryptic species and the designation of new species.

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Diagnostic description and geographic distribution of four new cryptic species of the blue-spotted maskray species complex (Myliobatoidei: Dasyatidae; Neotrygon spp.) based on DNA sequences

Abstract: Diagnostic description and geographic distribution of four new cryptic species of the blue-spotted maskray species complex (Myliobatoidei: Dasyatidae; Neotrygon spp.

Cited by 22 publications

References 54 publications

An annotated checklist of the chondrichthyans of Papua New Guinea

An annotated checklist of the chondrichthyans of Papua New Guinea

Delimiting cryptic species within the brown-banded bamboo shark, Chiloscyllium punctatum in the Indo-Australian region with mitochondrial DNA and genome-wide SNP approaches

Delimiting cryptic species in a shark with a low dispersal capability

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