Topic
Cyclemys
About: Cyclemys is a research topic. Over the lifetime, 19 publications have been published within this topic receiving 189 citations.
Papers
TL;DR: In this paper, the mtDNA sequence data (cyt b gene) in combination with nuclear DNA sequences (C-mos, Rag2 genes, R35 intron), nuclear genomic fingerprints (ISSR) and morphological data to reveal species diversity within the Southeast Asian leaf turtle genus Cyclemys, a morphologically difficult group comprising cryptic species.
Abstract: In the present study, we use mtDNA sequence data (cyt b gene) in combination with nuclear DNA sequences (C-mos, Rag2 genes, R35 intron), nuclear genomic fingerprints (ISSR) and morphological data to reveal species diversity within the Southeast Asian leaf turtle genus Cyclemys, a morphologically difficult group comprising cryptic species. Two morphologically distinct major groupings exist, a yellow-bellied species group with three taxa (Cyclemys atripons, C. dentata, C. pulchristriata) and a dark-bellied species group. The latter contains besides the morphologically variable C. oldhamii three additional new species (C. enigmatica n. sp., C. fusca n. sp., C. gemeli n. sp.). According to mtDNA data, C. fusca and C. gemeli constitute with high support the sister group of a clade comprising all other species, indicating that the dark-bellied species are not monophyletic, despite morphological similarity. mtDNA sequences of C. enigmatica, being highly distinct in nuclear genomic markers, do not differ from the sympatric C. dentata, suggesting that the original mitochondrial genome of C. enigmatica was lost due to introgressive hybridization. Morphological discrimination of Cyclemys species is possible using multivariate methods. However, gross morphology of most dark-bellied species on the one hand and of C. atripons and C. pulchristriata on the other is so similar that reliable species determination is only possible when genetic markers are used. The high diversity within Cyclemys requires revision of the IUCN Red List Categories for leaf turtles because the former assessment was based on the wrong assumption that in the entire range of the genus occurs only a single species.
63 citations
TL;DR: The phylogenetic hypothesis supports the recognition of four named species and a fifth species of unknown geographical provenance obtained from the Hong Kong pet trade, and shows that previous molecular phylogenetic studies were hampered by misidentifications.
Abstract: Species boundaries in Asian leaf turtles of the genus Cyclemys are difficult to define on the basis of morphology, primarily because many populations exhibit considerable ontogenetic variation in shell and head coloration. Two recent molecular phylogenetic hypotheses of Cyclemys species relationships, based largely on market and pet-trade samples of uncertain provenance, were highly incongruent. We used historical DNA methods to sequence fragments of the mitochondrial cytochrome b gene from eight type specimens of Cyclemys (including one collected by Alfred Russel Wallace), and phylogenetically placed these type sequences into the context of published cytochrome b variation. Our phylogenetic hypothesis supports the recognition of four named species (Cyclemys atripons, Cyclemys dentata, Cyclemys oldhamii, and C. pulchristriata), as well as a fifth species of unknown geographical provenance obtained from the Hong Kong pet trade. The type sequences show that previous molecular phylogenetic studies were hampered by misidentifications, supporting the notion that Cyclemys of unknown provenance are not reliably identified to species solely on the basis of morphology. © 2008 The Linnean Society of London, Biological Journal of the Linnean Society, 2008, 94, 131‐141. ADDITIONAL KEYWORDS: Geoemydidae ‐ historical DNA ‐ museum specimens ‐ species delimitation.
36 citations
TL;DR: External morphology and habitat of ten specimens of Cyclemys gemeli, a recently discovered leaf turtle species from north-eastern India, are described and mitochondrial data strongly suggest a sister group relationship of C. gemeli and C. fusca, another species occurring in Myanmar.
Abstract: We describe external morphology and habitat of ten specimens of Cyclemys gemeli, a recently discovered leaf turtle species from north-eastern India, previously known only from its incomplete holotype and photos of a live female. Further, we assess the phylogenetic position of C. gemeli using sequence data of the mitochondrial cytochrome b gene as well as of three nuclear DNA fragments (C-mos, Rag2 genes, intron 1 of R35 gene) and confirm its genetic distinctiveness. Mitochondrial data strongly suggest a sister group relationship of C. gemeli and C. fusca, another species occurring in Myanmar. According to our new records, the Naga Hills and the Arakan Mts could constitute the geographical divide between C. gemeli and C. fusca. Morphologically, C. gemeli resembles other dark-bellied Cyclemys species and determination by external morphology alone is quite difficult.
17 citations
TL;DR: The results suggested that the cryptic diversity of the reptile fauna of Laos still exists and highlighted the importance of field surveys and conservation actions.
Abstract: Wildlife is one of the most important food resources in Laos, and many species are sold at the local markets, but the fauna of the country remains poorly known. As a result of human impacts, including overharvesting for food consumption, many wild animals in Asia face imminent extinction. Our study focused on reptile species that were sold at local markets in Laos. The data were recorded in February, August, and September 2013. We found 16 reptile species in the local market: eight freshwater turtle species, Cuora amboinensis, Cyclemys oldhamii, Malayemys macrocephala, M. subtrijuga, Sacalia quadriocellata, Siebenrockiella crassicollis, Amyda ornata, and Pelodiscus sinensis, one tortoise species, Manouria impressa, four lizard species, Calotes versicolor, Physignathus cocincinus, Varanus nebulosus and V. salvator, and three snake species, Malayopython reticulatus and two species of Ptyas. Most of these reptile species are used by local people as foods. Two species are recorded for the first time...
16 citations
TL;DR: To mitigate turtle hunting, this work recommends a bottom-up, community-based conservation model, the foundation of which should be based on trust, traditional ecological knowledge, community participation, and ecological science.
Abstract: The Chittagong Hill Tracts (CHT) comprises an extensive expanse of hills located in the far southeast of Bangladesh, bordered by India and Myanmar. CHT covers more than 10% of the total land area of Bangladesh and lies within the Indo-Burma Biodiversity Hotspot. Because of political instability and the generally remote nature of this region, it remains as the least explored area in Bangladesh. Very little is known about the chelonian fauna of CHT. We investigated the occurrence, conservation status, and exploitation of chelonians in the southern part of CHT, in Sangu–Matamuhuri Reserve Forest and adjacent areas, from 2011 to 2015. During our survey, we obtained specimen-based records of 8 species: Arakan Forest Turtle (Heosemys depressa), Asian Brown Tortoise (Manouria emys), Keeled Box Turtle (Cuora mouhotii), Elongated Tortoise (Indotestudo elongata), Sylhet Roofed Turtle1 (Pangshura sylhetensis), Asian Leaf Turtle (Cyclemys spp.), Malayan Softshell Turtle (Amyda ornata), and Indian Flapshell T...
11 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2020 | 1 |
| 2019 | 2 |
| 2015 | 2 |
| 2010 | 2 |
| 2009 | 1 |
| 2008 | 2 |