174 research outputs found

    Two new species of Dixonius from Vietnam and Laos with a discussion of the taxonomy of Dixonius (Squamata, Gekkonidae)

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    Integrated analyses using maximum likelihood (ML), Bayesian inference (BI), principal component analysis (PCA), discriminate analysis of principal components (DAPC), multiple factor analysis (MFA), and analysis of variance (ANOVA) recovered two new diagnosable species of gekkonid lizards in the genus Dixonius, one from the Central Highlands, Gia Lai Province, Vietnam and another from the Vientiane Province, Laos. Phylogenetic analyses based on the mitochondrial NADH dehydrogenase subunit 2 gene (ND2) and adjacent tRNAs showed that Dixonius gialaiensis sp. nov. is the sister species of D. minhlei from Dong Nai Province, Vietnam and is nested within a clade that also includes the sister species D. siamensis and D. somchanhae. Dixonius muangfuangensis sp. nov. is the sister species to D. lao from Khammouane Province, Laos and is embedded in a clade with D. vietnamensis, D. taoi, and undescribed species from Thailand. Multivariate (PCA, DAPC, and MFA) and univariate (ANOVA) analyses using combinations of 15 meristic (scale counts), six morphometric (measurements), and five categorical (color pattern and morphology) characters from 44 specimens encompassing all eight species of Dixonius from Vietnam and Laos clearly illustrate Dixonius gialaiensis sp. nov. and Dixonius muangfuangensis sp. nov. are statistically different and discretely diagnosable from all closely related species of Dixonius. These integrative analyses also highlight additional taxonomic issues that remain unresolved within Dixonius and the need for additional studies. The discovery of these new species further emphasizes the underappreciated herpetological diversity of the genus Dixonius and illustrates the continued need for field work in these regions

    Carabid beetle larva (Epomis) predation on Microhyla heymonsi with a review of predation by carabid beetles on amphibians

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    A novel report of predation by a larval carabid (Epomis sp.) on Microhyla heymonsi (Microhylidae) from Myanmar prompted us to conduct a comprehensive review of predation by carabid beetles and their larvae on amphibians. A total of 18 beetle species representing 14 genera have been recorded to consume salamanders and frogs from 37 species in 30 genera of 19 families. Reports of predation by carabid beetles on amphibians exist from every continent where amphibians occur

    Another new species of Dixonius (Squamata, Gekkonidae) from Gia Lai Province in the Central Highlands, Vietnam

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    Another new species of Dixonius, D. fulbrighti sp. nov., is described from Gia Lai Province, in the Central Highlands of Vietnam, using an integrated approach based on morphological, categorical (color pattern), and mitochondrial NADH dehydrogenase subunit 2 gene (ND2) and its flanking tRNAs data. Phylogenetic analyses recovered Dixonius fulbrighti sp. nov. as closely related to D. gialaiensis from Gia Lai Province and part of a clade that includes D. minhlei, D. siamensis, and D. somchanhae. Multivariate (PCA, DAPC, and MFA) and univariate (ANOVA) analyses of 15 meristic (scale counts), six morphometric (mensural), and five categorical (color pattern and morphology) characters from 44 specimens of all eight species of Dixonius from Vietnam, Laos, and Cambodia clearly demonstrated that Dixonius fulbrighti sp. nov. is statistically different and diagnostically distinct from all closely related species of Dixonius. This new species discovery highlights the underestimated gecko diversity and the importance of continued fieldwork in the Central Highlands of Vietnam

    FIGURE 2 in Genetic and morphological concordance and discordance within the Cyrtodactylus brevipalmatus group (Squamata: Gekkonidae)

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    FIGURE 2. MFA of the species-level lineages based on the BEAST phylogeny and the percent contribution of the numeric data type to dimensions 1 and 2.Published as part of <i>Grismer, L. Lee, Shahrul Anuar, M. S., Muin, M. A., Ahmad, N. & Quah, Evan S. H., 2023, Genetic and morphological concordance and discordance within the Cyrtodactylus brevipalmatus group (Squamata: Gekkonidae), pp. 265-275 in Zootaxa 5353 (3)</i> on page 269, DOI: 10.11646/zootaxa.5353.3.4, <a href="http://zenodo.org/record/8427451">http://zenodo.org/record/8427451</a&gt

    FIGURE 1. A in Genetic and morphological concordance and discordance within the Cyrtodactylus brevipalmatus group (Squamata: Gekkonidae)

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    FIGURE 1. A. Location of the type locality (star) of Cyrtodactylus breviplamatus at Khao Luang, Nakhon Si Thammarat Provice, Thailand and C. cf. breviplamatus from Langkawi Island, Kedah State, Malaysia. B. Maximum clade credibility BEAST phylogeny of the Cyrtodactylus brevipalmatus group highlighting the sister lineages C. brevipalmatus and C. cf. brevipalmatus. Bayesian posterior probabilities (BPP) are listed at the nodes.Published as part of Grismer, L. Lee, Shahrul Anuar, M. S., Muin, M. A., Ahmad, N. & Quah, Evan S. H., 2023, Genetic and morphological concordance and discordance within the Cyrtodactylus brevipalmatus group (Squamata: Gekkonidae), pp. 265-275 in Zootaxa 5353 (3) on page 266, DOI: 10.11646/zootaxa.5353.3.4, http://zenodo.org/record/842745

    Genetic and morphological concordance and discordance within the Cyrtodactylus brevipalmatus group (Squamata: Gekkonidae)

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    Grismer, L. Lee, Shahrul Anuar, M. S., Muin, M. A., Ahmad, N., Quah, Evan S. H. (2023): Genetic and morphological concordance and discordance within the Cyrtodactylus brevipalmatus group (Squamata: Gekkonidae). Zootaxa 5353 (3): 265-275, DOI: 10.11646/zootaxa.5353.3.4, URL: http://dx.doi.org/10.11646/zootaxa.5353.3.

    FIGURE 3 in Genetic and morphological concordance and discordance within the Cyrtodactylus brevipalmatus group (Squamata: Gekkonidae)

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    FIGURE 3. Adult female (A) and adult male (B) Cyrtodactylus brevipalmatus from the type locality at Khao Luang National Park, Krung Ching Waterfall, Nakhon Si Thammarat Province, Thailand. Photo from Creative Commons Attribution Share Alike. Adult females of C. cf. brevipalmatus USMHC 2555 (C) and LSUHC 11788 (D) from Gunung Raya, Langkawi Island, Kedah State, Malaysia.Published as part of Grismer, L. Lee, Shahrul Anuar, M. S., Muin, M. A., Ahmad, N. & Quah, Evan S. H., 2023, Genetic and morphological concordance and discordance within the Cyrtodactylus brevipalmatus group (Squamata: Gekkonidae), pp. 265-275 in Zootaxa 5353 (3) on page 270, DOI: 10.11646/zootaxa.5353.3.4, http://zenodo.org/record/842745

    A new species of the Cyrtodactylus brevipalmatus group (Squamata, Gekkonidae) from the uplands of western Thailand

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    An integrative systematic analysis recovered a new species of the Cyrtodactylus brevipalmatus group from the uplands of Thong Pha Phum National Park, Kanchanaburi Province in western Thailand. Cyrtodactylus thongphaphumensis sp. nov. is deeply embedded within the brevipalmatus group, bearing an uncorrected pairwise sequence divergence of 7.6–22.3% from all other species based on a 1,386 base pair segment of the mitochondrial NADH dehydrogenase subunit 2 gene (ND2) and adjacent tRNAs. It is diagnosable from all other species in the brevipalmatus group by statistically significant mean differences in meristic and normalized morphometric characters as well as differences in categorical morphology. A multiple factor analysis recovered its unique and non-overlapping placement in morphospace as statistically significantly different from that of all other species in the brevipalmatus group. The description of this new species contributes to a growing body of literature underscoring the high degree of herpetological diversity and endemism across the sky-island archipelagos of upland montane tropical forest habitats in Thailand, which like all other upland tropical landscapes, are becoming some of the most imperiled ecosystems on the planet
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