{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,16]],"date-time":"2026-01-16T00:15:21Z","timestamp":1768522521193,"version":"3.49.0"},"reference-count":46,"publisher":"Pensoft Publishers","license":[{"start":{"date-parts":[[2026,1,15]],"date-time":"2026-01-15T00:00:00Z","timestamp":1768435200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["BDJ"],"abstract":"<jats:p>\n                    The Tam Dao Mountain Stream Keelback,\n                    <jats:italic>Opisthotropis tamdaoensis<\/jats:italic>\n                    Ziegler, David &amp; Vu, 2008, was previously described, based on one single holotype and subsequently expanded according to four newly-collected specimens from the type locality. Information on this species is extremely limited.\n                  <\/jats:p>\n                  <jats:p>\n                    On the basis of newly-collected\n                    <jats:italic>Opisthotropis<\/jats:italic>\n                    specimens from Hekou, Yunnan, China, this study reports the first country record of\n                    <jats:italic>Opisthotropis tamdaoensis<\/jats:italic>\n                    from China. The Chinese\n                    <jats:italic>Opisthotropis tamdaoensis<\/jats:italic>\n                    population totally agrees with the original description of this species and revealed only a minor genetic distance (lower than 2.9%) in the mitochondrial gene fragment of the cytochrome\n                    <jats:italic>b<\/jats:italic>\n                    (\n                    <jats:italic>Cytb<\/jats:italic>\n                    ) compared with the topotypic population. Based upon the our newly-collected specimens and published data, we revised the diagnosis of\n                    <jats:italic>Opisthotropis tamdaoensis<\/jats:italic>\n                    :\n                  <\/jats:p>\n                  <jats:p>\n                    <jats:list>\n                      <jats:list-item>\n                        <jats:p>nasal not divided below nostril;<\/jats:p>\n                      <\/jats:list-item>\n                      <jats:list-item>\n                        <jats:p>loreal usually 1, not in contact with internasals;<\/jats:p>\n                      <\/jats:list-item>\n                      <jats:list-item>\n                        <jats:p>pre-oculars 1\u20132, postoculars 2 subocular, usually 1;<\/jats:p>\n                      <\/jats:list-item>\n                      <jats:list-item>\n                        <jats:p>anterior temporals 1\u20132, posterior temporals 2\u20134;<\/jats:p>\n                      <\/jats:list-item>\n                      <jats:list-item>\n                        <jats:p>supralabials usually 9, only the fifth or fifth to sixth supralabial (rarely none) in contact with the orbit;<\/jats:p>\n                      <\/jats:list-item>\n                      <jats:list-item>\n                        <jats:p>infralabials usually 9\u201310;<\/jats:p>\n                      <\/jats:list-item>\n                      <jats:list-item>\n                        <jats:p>first pair of chin shields longer than the second pair;<\/jats:p>\n                      <\/jats:list-item>\n                      <jats:list-item>\n                        <jats:p>dorsal scales smooth anteriorly, keeled posteriorly, in (17\u201319)-17-17 rows;<\/jats:p>\n                      <\/jats:list-item>\n                      <jats:list-item>\n                        <jats:p>tails relatively short, TaL\/TL 0.143\u20130.161;<\/jats:p>\n                      <\/jats:list-item>\n                      <jats:list-item>\n                        <jats:p>pre ventrals 0\u20134, ventrals 160\u2013176, precloacal divided; 48\u201356 divided subcaudals;<\/jats:p>\n                      <\/jats:list-item>\n                      <jats:list-item>\n                        <jats:p>uniform olive-grey dorsum, with a dark longitudinal lateral stripe within the dark flank colouration, ventral side pale or light yellow, without sharp transition towards the dark dorsal colouration, subcaudal region may bear dark mottling.<\/jats:p>\n                      <\/jats:list-item>\n                    <\/jats:list>\n                  <\/jats:p>\n                  <jats:p>nasal not divided below nostril;<\/jats:p>\n                  <jats:p>loreal usually 1, not in contact with internasals;<\/jats:p>\n                  <jats:p>pre-oculars 1\u20132, postoculars 2 subocular, usually 1;<\/jats:p>\n                  <jats:p>anterior temporals 1\u20132, posterior temporals 2\u20134;<\/jats:p>\n                  <jats:p>supralabials usually 9, only the fifth or fifth to sixth supralabial (rarely none) in contact with the orbit;<\/jats:p>\n                  <jats:p>infralabials usually 9\u201310;<\/jats:p>\n                  <jats:p>first pair of chin shields longer than the second pair;<\/jats:p>\n                  <jats:p>dorsal scales smooth anteriorly, keeled posteriorly, in (17\u201319)-17-17 rows;<\/jats:p>\n                  <jats:p>tails relatively short, TaL\/TL 0.143\u20130.161;<\/jats:p>\n                  <jats:p>pre ventrals 0\u20134, ventrals 160\u2013176, precloacal divided; 48\u201356 divided subcaudals;<\/jats:p>\n                  <jats:p>uniform olive-grey dorsum, with a dark longitudinal lateral stripe within the dark flank colouration, ventral side pale or light yellow, without sharp transition towards the dark dorsal colouration, subcaudal region may bear dark mottling.<\/jats:p>\n                  <jats:p>\n                    This finding broadly extends our understanding of this poorly-known snake species and raises the total known\n                    <jats:italic>Opisthotropis<\/jats:italic>\n                    number in China to 14. Moreover, this study reports the second\n                    <jats:italic>Opisthotropis<\/jats:italic>\n                    species in Yunnan Province, China.\n                  <\/jats:p>","DOI":"10.3897\/bdj.14.e181301","type":"journal-article","created":{"date-parts":[[2026,1,15]],"date-time":"2026-01-15T09:00:43Z","timestamp":1768467643000},"source":"Crossref","is-referenced-by-count":0,"title":["Expanded description and distribution of Opisthotropis tamdaoensis Ziegler, David &amp;amp; Vu, 2008 (Squamata, Natricidae), first record from Yunnan Province of China"],"prefix":"10.3897","volume":"14","author":[{"given":"Siyuan","family":"Zhao","sequence":"first","affiliation":[{"name":"Central South Forest Inventory and Planning Institute of State Forestry Administration, Changsha, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Dingding","family":"Ou","sequence":"additional","affiliation":[{"name":"Central South Forest Inventory and Planning Institute of State Forestry Administration, Changsha, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Long","family":"Zhang","sequence":"additional","affiliation":[{"name":"Central South Forest Inventory and Planning Institute of State Forestry Administration, Changsha, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4214-9060","authenticated-orcid":true,"given":"Bo","family":"Cai","sequence":"additional","affiliation":[{"name":"China-Croatia Belt and Road Joint Laboratory on Biodiversity and Ecosystem Services, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0003-8611-4550","authenticated-orcid":true,"given":"Shun","family":"Ma","sequence":"additional","affiliation":[{"name":"China-Croatia Belt and Road Joint Laboratory on Biodiversity and Ecosystem Services, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, China"},{"name":"University of Chinese Academy of Science, Beijing, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7825-3006","authenticated-orcid":true,"given":"Shuo","family":"Liu","sequence":"additional","affiliation":[{"name":"Kunming Natural History Museum of Zoology, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, China"},{"name":"Yunnan Key Laboratory of Biodiversity Information, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Keji","family":"Guo","sequence":"additional","affiliation":[{"name":"Central South Forest Inventory and Planning Institute of State Forestry Administration, Changsha, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Wei","family":"Zhou","sequence":"additional","affiliation":[{"name":"Central South Forest Inventory and Planning Institute of State 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