Rediscovery and redescription of Dixonius siamensis (Boulenger, 1899) (Squamata: Gekkonidae), type species of the genus, with lectotype designation DOI
Olivier S. G. Pauwels, S. N. Das, Jonathan Brecko

et al.

Zootaxa, Journal Year: 2024, Volume and Issue: 5543(3), P. 301 - 328

Published: Dec. 3, 2024

We redescribe the type material of Phyllodactylus siamensis Boulenger, 1899, species Southeast Asian gekkonid genus Dixonius Bauer, Good & Branch, 1997, using external morphology and cranial osteology. There is some evidence that series contains more than one species; we hence designate a lectotype in order to stabilize nomenclature provide precision on geographical location locality. Because current concept auctorum incomplete composite, revised diagnosis based presently designated paralectotype from same locality, as well observations new locality first photographs live topotypical individuals. regard probably geographically restricted Dong Phaya Yen mountain range central Thailand, numerous published mentions this outside likely refer other or undescribed taxa. treat burmanicus Annandale, 1905 Tavoy, southern Myanmar, valid species, comb. nov.

Language: Английский

An integrative taxonomic revision of the Trimeresurus popeiorum group of pitvipers (Reptilia: Serpentes: Viperidae) with descriptions of two new species from the Indo-Burma Biodiversity Hotspot DOI Creative Commons
Sabira S. Idiiatullina, Tan Van Nguyen, Parinya Pawangkhanant

et al.

Vertebrate Zoology, Journal Year: 2024, Volume and Issue: 74, P. 303 - 342

Published: April 4, 2024

Abstract Despite recent progress in our understanding of diversity within the genus Trimeresurus Lacépède, 1804, subgenus Popeia Malhotra & Thorpe, 2004, distributed across most parts East and Southeast Asia, remains taxonomically challenging. We applied an integrative taxonomic approach including analyses morphological data four mitochondrial genes (12S 16S rRNA, cytochrome b , NADH dehydrogenase subunit 4), along with examination available type material, to address longstanding questions one clade T. popeiorum group, reveal a high level hidden these snakes Indo-Burma Biodiversity Hotspot. confirm that Smith, 1937 sensu stricto is restricted Northeast India, eastern Nepal, southern Bhutan, southeastern Bangladesh, western Yunnan Province (China), northern southwestern Myanmar. further recently described species yingjiangensis Chen et al., 2019 junior synonym . In addition, we discovered combination Trimesurus [sic] elegans Gray, 1853 valid senior threatens stability latter taxon. Therefore, order protect nomen accordance Article 23.9 International Code Zoological Nomenclature, regard taxon as oblitum render protectum. Examination larger series specimens allows us describe two new cryptic from Region. This study brings total number six also suggests subspecific taxonomy sabahi complex requires investigation. urge adequate actions regarding conservation newly recommend studies on their toxicology.

Language: Английский

Citations

7
A new endemic karst-associated species of lance-headed pit viper (Squamata, Viperidae, Protobothrops) from Laos DOI Creative Commons

Rupert J. Grassby-Lewis,

Peter Brakels,

Nathanaël Maury

et al.

Herpetozoa, Journal Year: 2025, Volume and Issue: 38, P. 43 - 60

Published: Feb. 25, 2025

We describe a new species of lance-headed pit viper from north-western Laos, based on morphological and molecular (6092 bp cyt b , ND4, COI, 12S rRNA 16S mitochondrial DNA genes c-mos RAG1 nuclear genes) lines evidence. Protobothrops flavirostris sp. nov. is easily distinguished its congeners by the following combination characters: dorsal scales in 23–21–17 rows, all keeled; ventral 215; subcaudal 79, paired; supralabials 7–8; infralabials 10; horn-like projections supraoculars absent; head triangular with typical lance-shaped pattern surface; three faint dark vertical stripes snout; blackish-brown rostral, nasals, preoculars, loreals two anterior supralabials, as well parts yellow-orange; surfaces body tail brown or greyish-brown, dorsum large reddish-brown cross-shaped blotches, edged black, somewhat fused together forming an interrupted zigzag line row ventrolateral blotches each side. The differs morphologically similar kelomohy significant divergence cytochrome gene sequences (p = 7.8%). currently known only tropical limestone forest Vientiane Province, Laos (elevation 362 m a.s.l.). suggest be considered Endangered (EN) IUCN’s Red List categories.

Language: Английский

Citations

0
A snake can change its finery: a new cryptic species of the Trimeresurus kanburiensis complex (Reptilia: Serpentes: Viperidae) from central Thailand with an unusual ontogenetic color change DOI
Parinya Pawangkhanant, Sabira S. Idiiatullina, Tan Van Nguyen

et al.

Zootaxa, Journal Year: 2025, Volume and Issue: 5621(5), P. 514 - 546

Published: April 21, 2025

We describe a new species of green pitviper from the northern part Central Thailand based on morphological and molecular (2406 bp cyt b, ND4, 16S rRNA mitochondrial DNA genes fragments) lines evidence. Trimeresurus cryptographicus sp. nov. is distinguished its congeners by combination following characters: small size, maximum known SVL 523 mm; dorsal scales in 23(22)-21-15 rows, moderately keeled except outermost rows; ventral 171–178; subcaudal 57–73, all paired; iris golden yellow both sexes; body uniformly bright grass-green with indistinct serrated dark transverse markings adults (499–523 mm SVL) but neonates juveniles (231–245 have prominent irregular, grey crossbands light dorsum; suborbital stripe bluish-white thin male, absent females; ventrolateral stripe, white, distinct, present first two scale rows throat, chin, lower labials pale blue; surfaces greenish-yellow; tail brick-red mottled spots, side white markings. While differs morphologically similar macrops notable divergence sequences, it more closely related to T. kuiburi (p = 1.7% for cytochrome p 1.6% rRNA, 1.8% ND4 gene fragments). The currently only low elevation tropical limestone forest Phitsanulok Province, central (ca. 100 m a.s.l.). This discovery further underlines importance massifs Indochina as local centres herpetofaunal diversity endemism.

Language: Английский

Citations

0
A new species of green pitviper of the Trimeresurus macrops complex (Reptilia: Serpentes: Viperidae) from South Central Coastal Region of Vietnam DOI
Sabira S. Idiiatullina,

TAN VAN NGUYEN,

ANDREY M. BRAGIN

et al.

Zootaxa, Journal Year: 2024, Volume and Issue: 5474(4), P. 375 - 411

Published: July 1, 2024

We describe a new species of green pitviper from southern and central parts coastal Vietnam based on morphological molecular (2406 bp cyt b, ND4, 16S rRNA mitochondrial DNA genes) lines evidence. Trimeresurus cyanolabris sp. nov. is distinguished its congeners by the combination following characters: small size, maximum known SVL 638 mm; dorsal scales in 21 (rarely 23)–21–15 rows, moderately keeled except outermost rows; ventral 166–178; subcaudal 52–75, all paired; hemipenis forked, calyculate, reaching 8th subcaudal; eye bright yellow both sexes; surface deep lacking cross-bands; postocular white stripe missing ventrolateral faintly present first few scale rows males, absent females; throat, chin, lower labials shades blue. The forms distinct clade phylogenetic tree genus differs morphologically similar T. rubeus significant divergence cytochrome b gene sequences (p = 6.0%). currently low- to mid-elevations (ca. 90–400 m a.s.l.) tropical forests central-southern Vietnam. This discovery further underlines importance this area as local center herpetofaunal diversity endemism, which under great threat deforestation.

Language: Английский

Citations

3
A redescription and range extension of Trimeresurus caudornatus Chen, Ding, Vogel & Shi, 2020 (Serpentes: Viperidae) DOI
Tan Van Nguyen, Sabira S. Idiiatullina,

Win Paing Oo

et al.

Zootaxa, Journal Year: 2024, Volume and Issue: 5514(3), P. 201 - 231

Published: Sept. 26, 2024

The pitviper species Trimeresurus caudornatus was recently described based on only two specimens from Nabang Town, Yingjiang County, Yunnan Province, China. Here, we provide additional data this a re-examination of 19 preserved specimens, 16 reported in earlier literature sources, and photo-documented records northern Myanmar (Burma) adjacent All new were previously identified as albolabris sensu lato or septentrionalis lato. Molecular analyses mitochondrial DNA supported the morphological findings establishing conspecificity with T. caudornatus. newly have pairwise distance 0.4–2.6% those type series (based cytochrome b gene). Based these findings, confirm presence update its diagnostic characters distribution. We suggest should be considered Least Concern (LC) following IUCN’s Red List categories. Further studies reassessing populations complex are required.

Language: Английский

Citations

2
Rediscovery and redescription of Dixonius siamensis (Boulenger, 1899) (Squamata: Gekkonidae), type species of the genus, with lectotype designation DOI
Olivier S. G. Pauwels, S. N. Das, Jonathan Brecko

et al.

Zootaxa, Journal Year: 2024, Volume and Issue: 5543(3), P. 301 - 328

Published: Dec. 3, 2024

We redescribe the type material of Phyllodactylus siamensis Boulenger, 1899, species Southeast Asian gekkonid genus Dixonius Bauer, Good & Branch, 1997, using external morphology and cranial osteology. There is some evidence that series contains more than one species; we hence designate a lectotype in order to stabilize nomenclature provide precision on geographical location locality. Because current concept auctorum incomplete composite, revised diagnosis based presently designated paralectotype from same locality, as well observations new locality first photographs live topotypical individuals. regard probably geographically restricted Dong Phaya Yen mountain range central Thailand, numerous published mentions this outside likely refer other or undescribed taxa. treat burmanicus Annandale, 1905 Tavoy, southern Myanmar, valid species, comb. nov.

Language: Английский

Citations

1