Male Dimorphism in a New Interstitial Species of the Genus Microloxoconcha (Podocopida: Ostracoda)

Higashi, Ryouichi; Tsukagoshi, Akira; Kimura, Hiroyuki; Kato, Kenji

doi:10.1651/09-3234.1

Cited by 11 publications

(9 citation statements)

References 22 publications

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“…This value is almost identical to the interspecies genetic distances of other podocopid ostracods (Yamaguchi 2000, Higashi et al 2011) or somewhat larger (Martens et al 2005, Brandăo et al 2010, Karanovic 2015). The distance revealed by the nucleotide and amino acid sequences demonstrated that the distance between Paracobanocythere vietnamensis sp.…”

Section: Discussionsupporting

confidence: 77%

A new interstitial ostracod species of the genus Paracobanocythere from Vietnam, with mitochondrial CO1 sequence data of three Asian species

Tanaka¹,

Dung²,

Higashi³

et al. 2016

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This study is a first report of an interstitial ostracod from Southeast Asia. The ostracod species, Paracobanocythere vietnamensis sp. n., was found in the marine interstitial environment of Phu Quoc Island, Vietnam. Thus far, three species of this genus have been described. The morphology of the carapace as well as the appendages of this new species are quite similar to Paracobanocythere hawaiiensis and Paracobanocythere watanabei. However, we found that they could be easily distinguished according to the morphology of the male copulatory organ. Additionally, we estimated the evolutionary distances among these three species based on nucleotide and amino acid sequences of the mitochondrial CO1 gene. Similar morphologies of carapaces and appendages, and relatively small evolutionary distances according to CO1 between Paracobanocythere vietnamensis sp. n. and Paracobanocythere watanabei suggest that these two species are very closely related.

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Section: Discussionsupporting

confidence: 77%

A new interstitial ostracod species of the genus Paracobanocythere from Vietnam, with mitochondrial CO1 sequence data of three Asian species

Tanaka¹,

Dung²,

Higashi³

et al. 2016

Self Cite

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“…Higashi et al . [ 42 ] studied several populations of Microloxoconcha dimorpha Higashi et al ., 2011, an interstitial ostracod with high morphological variability. Phylogenetic trees constructed based on COI sequences did not support the presence of separate species for the different morphological forms, while the genetic distance ranged from 0.2 to 0.8% between geographically close populations and slightly more than 6% between allopatric populations.…”

Section: Discussionmentioning

confidence: 99%

Barcoding of Ancient Lake Ostracods (Crustacea) Reveals Cryptic Speciation with Extremely Low Distances

Karanovic

2015

PLoS ONE

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Ostracods are drastically reduced crustaceans, with never more than eight appendages enclosed between two valves, leaving only a limited number of morphological characters for species delineation. Conservative morphology of characters used to define genera, along with high variability of characters used to define species are creating problems in applying a morphospecies concept. A high intraspecific variability in a Lake Biwa (Japan) endemic, Physocypria biwaensis (Okubo, 1990), has been observed previously but was never studied in detail. Two sympatric forms, differing in pigmentation and size, suggest a presence of reproductive isolation. The aim of this study is to employ molecular and morphometric tools to aid in species delineation within P. biwaensis complex and reconstruct their phylogenetic relationships. A fragment of the mtCOI gene was amplified from 30 specimens, and an additional 37 specimens were studied for morphological characters. Resulting phylogenies showed that each morphologically distinct form is associated with a distinct phylogenetic group based on mtDNA. The average pairwise distance is very low (5%), indicating a recent divergence time. I speculate that there is a possibility that one of them originated in the lake, while the other probably colonized it afterwards. This seems to be supported with an apparent niche partitioning at different depths. In spite of the fact that traditionally used sexual characters are highly variable in these two species, the morphometric analysis of shell and soft part related characters clearly delineates them and suggests that such characters may be useful for future detection of seemingly cryptic ostracod species.

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“…Several studies reported that 95% could be used for species-level barcoding [17,[22][23]. The use of 3% to 5% genetic divergences must be added by other data [31], including geographic localities [32]. This study utilized the geographic localities of the samples and reference species as additional considerations for species determination.…”

Section: Taxonomic Statusmentioning

confidence: 99%

“…Combining both molecular and conventional identification for WJM5, we finally decided that WJM5 was referred to as L. decussatus. The argument was that samples of single species collected from different localities could have a relatively low genetic identity and high genetic distance to their conspecific references in barcode libraries [6,17,[21][22][23][31][32].…”

Section: Molecular Barcoding Versus Morphological Identificationmentioning

confidence: 99%

Molecular barcoding of marine ornamental fish from the southern coast of West Java validates conventional identification

2021

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Conventional identification of marine ornamental fish has faced difficulties due to similar color patterns of closed related species, or juvenile individuals have different color patterns from adult individuals. Molecular barcoding using the cytochrome c oxidase I (COI) gene provides a reliable tool for unmasking such difficulties. This study aimed to barcode marine ornamental fish from the southern coast of West Java. Fragment of the COI gene was sequenced from 54 morphotypes. In this study, we determined the taxonomic status of the samples based on a 5% genetic divergence, with the parameter including sequence percent identity, genetic distance, and length of monophyletic branch in a phylogenetic tree. The result showed that most samples had a high percentage of sequence identities, low genetic distances, and short chapters in monophyletic clades, but the remaining were not. Those data indicated that most samples could be identified at species-level without doubt and support conventional identification. Barcoding success is also depending on the availability of conspecific sequences in the databases. This study concluded that molecular barcoding could strengthen and validate traditional identification.

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Male Dimorphism in a New Interstitial Species of the Genus Microloxoconcha (Podocopida: Ostracoda)

Cited by 11 publications

References 22 publications

A new interstitial ostracod species of the genus Paracobanocythere from Vietnam, with mitochondrial CO1 sequence data of three Asian species

A new interstitial ostracod species of the genus Paracobanocythere from Vietnam, with mitochondrial CO1 sequence data of three Asian species

Barcoding of Ancient Lake Ostracods (Crustacea) Reveals Cryptic Speciation with Extremely Low Distances

Molecular barcoding of marine ornamental fish from the southern coast of West Java validates conventional identification

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