Cyrtodactylus samroiyot, a new limestone-dwelling Bent-toed Gecko (Squamata: Gekkonidae) from Prachuap Khiri Khan Province, peninsular Thailand.

We describe Cyrtodactylus samroiyot sp. nov. from a limestone relief in Sam Roi Yot District, Prachuap Khiri Khan Province, peninsular Thailand. It is characterized by a maximal known SVL of 66.9 mm; 17-18 longitudinal rows of dorsal tubercles; 33-34 longitudinal rows of ventrals across the abdomen between the ventrolateral skin folds; a continuous series of seven precloacal pores in males (six shallow precloacal pits in females); a series of slightly enlarged, poreless and pitless femoral scales; no precloacal groove nor depression; median row of transversely enlarged subcaudal scales; a complete nuchal loop; and a dorsal pattern consisting of three long dark brown bands, one above shoulders and two above abdomen. 

Cyrtodactylus khelangensis, a new cave-dwelling Bent-toed Gecko (Squamata: Gekkonidae) from Lampang Province, northern Thailand.

We describe Cyrtodactylus khelangensis sp. nov. from a limestone cave in Pratu Pha, Mae Mo District, Lampang Province, northern Thailand. It is characterized by a maximal known SVL of 95.3 mm; 16-20 longitudinal rows of dorsal tubercles; a continuous series of 37-40 enlarged femoroprecloacal scales, including six-seven pitted or pore-bearing scales (males) or one or two pitted scales (females) on each femur separated by a diastema from 2-6 pore-bearing precloacal scales (males and females); no precloacal groove nor depression; transversely enlarged subcaudal scales; and four irregular brown dorsal bands between nuchal loop and hind limb insertions.

A new forest-dwelling Bent-toed Gecko (Squamata: Gekkonidae: Cyrtodactylus) from Doi Suthep, Chiang Mai Province, northern Thailand.

We describe a new forest-dwelling Cyrtodactylus from Doi Suthep, Chiang Mai Province, northern Thailand. Cyrtodactylus doisuthep sp. nov. is characterized by a maximal known SVL of 90.5 mm; 19 or 20 longitudinal rows of dorsal tubercles; a continuous series of 34 or 35 enlarged femoro-precloacal scales, including six or seven pitted scales on each femur (male and females) separated by a diastema from six pitted (females) or pore-bearing (male) precloacal scales; no precloacal groove or depression; transversely enlarged subcaudal scales; and six or seven irregular thin beige dorsal bands between limb insertions. 

Cyrtodactylus sanook (Squamata: Gekkonidae), a new cave-dwelling gecko from Chumphon Province, southern Thailand.

We describe a new cave-dwelling species, Cyrtodactylus sanook sp. nov., from Tham Sanook, Chumphon Province, southern Thailand, characterized by a maximum SVL of 79.5 mm; 18-20 longitudinal rows of dorsal tubercles at midbody; a continuous series of enlarged femoral and precloacal scales, no femoral pores, three or four precloacal pores in males (no pores in females), no precloacal groove nor depression; 19-20 subdigital lamellae on 4th toe; transversally enlarged subcaudal plates; and 6-7 irregular pale narrow dorsal bands between limb insertions. It seems endemic to this cave and is the 7th Thai Cyrtodactylus species that is known only from a cave environment.

A new Four-clawed Gecko from limestone hills in Lopburi Province, central Thailand (Squamata, Gekkonidae: Gehyra).

We describe Gehyra wongchan sp. nov. from Tham Khao Chan (Khao Chan Cave), Tha Luang District, and Wat Khao Wong, Kok Samrong District, in Lopburi Province, central Thailand. The new species differs from all currently recognized Gehyra by the following combination of morphological characters and dorsal color pattern: maximal known snoutvent length of 52.4 mm, 810 supralabials, 7680 dorsal and 4850 ventral scale rows around midbody, absence of skin folds on limbs, 17 or 18 preanofemoral pores in males in a continuous series extending to mid-length of femur (pores absent in females), tail not- to moderately widened behind vent in adults, a single row of widened subcaudals, digits and toes unwebbed, 7 or 8 divided subdigital lamellae on 4th toe, and a dorsal pattern with white spots as large or larger than adjacent crescentic black markings on a beige to light-brown background.

Combined proteomic strategies for in-depth venomic analysis of the beaked sea snake (Hydrophis schistosus) from Songkhla Lake, Thailand.

This study focuses on comprehensive characterization of the venom proteome of the beaked sea snake (Hydrophis schistosus) from Songkhla Lake, Thailand. H. schistosus can be considered as the deadliest sea snake commonly found in the Pacific and Indian oceans. Their envenomation causes muscular paralysis and rhabdomyolysis. To develop effective treatment for this snakebite, it is necessary to understand the detailed venom composition. In this study, multiple mass spectrometry-based approaches were employed. Bottom-up proteomics revealed that tryptic digestion in-solution provided a higher number of toxin proteins identified and a larger sequence coverage, compared to in-gel digestion. In addition, a venom gland transcriptome-derived database was constructed and used as a reference, which 43 known and novel toxin proteins were identified using this database and the UniProtKB. Three-finger toxin and phospholipase A2 were shown to be top two most abundant protein families. Minor compositions included other toxin families and a number of non-toxin proteins. Moreover, a hybrid de novo sequencing was performed to enhance identification of the small proteins/peptides. Using non-digested samples, there were 46 predicted toxin peptides. The finding from this study could lead to a better understanding in pathological effects of the snakebite and the future development of effective antivenoms. SIGNIFICANCE: This study provides a better understanding of the venom proteome composition of the beaked sea snake (H. schistosus) found in the Gulf of Thailand, using a combination of different sample preparation techniques, Serpentes protein database searching, transcriptome-derived protein database searching, and a hybrid de novo peptide sequencing strategy. It revealed 13 toxin protein families and novel proteins in the beaked sea snake venom including new species of phospholipase A2s (PLA2s) and three-finger toxins (3FTxs). It could serve as a basis for the development of snakebite treatments and for the discovery of novel pharmaceutical drugs from the toxin peptides.

Two new Kukri Snake species (Colubridae: Oligodon) from the Nakhon Si Thammarat Mountain Range, and addition of O. ocellatus to the fauna of Thailand.

We describe two new Kukri snakes of the genus Oligodon from the Nakhon Si Thammarat Mountain Range, southern peninsular Thailand. Oligodon phangan sp. nov., endemic to Pha-Ngan Island, Surat Thani Province, is characterized by a maximal known SVL of 369.1 mm; 12 maxillary teeth, the posterior three enlarged; 17-17-15 dorsal scale rows; 163-166 ventrals; 33-42 divided subcaudals; a single anal; dorsal color brown with a pair of discreet paravertebral and lateral stripes; no dorsal or supracaudal bands, blotches or crossbars; background color of belly pinkish-orange; underside of tail immaculate. Oligodon promsombuti sp. nov., whose type-locality is Khao Phanom Wang, Surat Thani Province, is also found in Trang Province, and is characterized by a maximal known SVL of 552.7 mm; 12 maxillary teeth, the posterior three enlarged; 17-17-15 dorsal scale rows; 177 ventrals; 40 divided subcaudals; a single anal; deeply forked hemipenes lacking spines; dorsal color blackish brown with nearly indistinct paravertebral stripes; no dorsal or supracaudal blotches or crossbars; background color of belly ivory, heavily speckled with subrectangular blackish blotches. We tentatively allocate both new species to the informal Oligodon-cyclurus-group. They are the 5th and 6th Oligodon species endemic to Thailand. We add Oligodon ocellatus, so far known only from Cambodia, southern Laos and southern Vietnam, to the Thai fauna, based on a specimen from Chong Mek, Ubon Ratchathani Province.

A new sandstone-dwelling leaf-toed gecko (Gekkonidae: Dixonius mekongensis) from the Thai-Lao border.

We describe Dixonius mekongensis sp. nov. from sandstone formations in Khong Chiam District, Ubon Ratchathani Province, in extreme eastern Thailand along the Laotian border. The new species differs from all currently recognized Dixonius by the following combination of morphological characters and pattern: maximal known snout-vent length of 51.2 mm; 16 longitudinal rows of dorsal tubercles; 32 to 34 paravertebral scales; 22 to 24 longitudinal rows of ventral scales across the abdomen; seven precloacal pores in males, no pores in females; a marked canthal stripe; and a spotted to uniform dorsal pattern. This description brings the number of Dixonius species to 13, with six species endemic to Thailand.

A new cave-dwelling Gekko (Gekko) from Lopburi Province, central Thailand (Squamata, Gekkonidae).

We describe Gekko pradapdao sp. nov. from Tham Khao Chan (Khao Chan Cave), Tha Luang District, Lopburi Province, in central Thailand. The new species, a member of the subgenus Gekko, differs from all currently recognized Gekko species by the following combination of morphological characters and pattern: maximal known snout-vent length of 127.1 mm, lack of contact between nostrils and rostral, 2428 interorbital scales between supraciliaries, 8991 scale rows around midbody, 1618 dorsal tubercle rows at midbody, 3034 ventral scale rows at midbody, 1113 precloacal pores in males, a single postcloacal tubercle on each side of the base of the tail, 1316 subdigital lamellae on 1st toe and 1719 on 4th toe, no Y-shaped mark on head, non-banded dorsal pattern on a dark chocolate brown to black background, and a dark brown iris. Urgent actions should be taken to evaluate the conservation status of the new species.

A new karst-dwelling, colorful pitviper (Viperidae: Trimeresurus) from northern Peninsular Thailand.

We describe a colorful and distinctively patterned, karst-dwelling pitviper, Trimeresurus kuiburi sp. nov., from the isolated, coastal massif of Khao Sam Roi Yot in Kui Buri District, Prachuap Khiri Khan Province, in northern Peninsular Thailand. The new species, member of the 'Cryptelytrops group' sensu Malhotra Thorpe (2004) and morphologically and genetically allied to Trimeresurus kanburiensis and T. venustus, differs from all pitviper taxa by a combination of red/purple bands on a green dorsum; a white concave suborbital stripe in males (straight and less visible in females); white, spaced vertebral dots in males (absent in females); pale green belly lacking dark dots or stripe on the lateral sides of the ventrals; partially fused first supralabial and nasal scale; 19 dorsal scale rows at midbody; 164171 ventrals; 6365 subcaudals in males, 5153 in females; maximal known SVL of 451 mm; and long, papillose hemipenes.

A new leaf-toed gecko (Gekkonidae: Dixonius) from the city of Ranong, southwestern Thailand.

We describe Dixonius dulayaphitakorum sp. nov. from Ranong city, Ranong Province, southern peninsular Thailand. The new, ground-dwelling species differs from all currently recognized Dixonius by a combination of morphological characters and pattern: maximal known SVL of 47.8 mm, 22 longitudinal rows of dorsal tubercles; 33 to 35 paravertebral scales; 22 longitudinal rows of ventrals across the abdomen; six or seven precloacal pores in males, no pores in females; no distinct canthal stripe; and a spotted dorsal pattern. Based on dorsal pattern, the new species seems related to Dixonius siamensis. This description brings to 11 the number of Dixonius species, and to five the ones endemic to Thailand.

A new limestone-dwelling leaf-toed gecko (Gekkonidae: Dixonius) from coastal hills in Cha-am, peninsular Thailand.

We describe Dixonius pawangkhananti sp. nov. from coastal limestone hills in Cha-am District, Phetchaburi Province, peninsular Thailand. The new species differs from all currently recognized Dixonius by the following combination of morphological characters and pattern: maximal known snout-vent length of 42.6 mm; 16 longitudinal rows of dorsal tubercles; 30 to 32 paravertebral scales; 16 longitudinal rows of ventral scales across the abdomen; six precloacal pores in males, no pores in females; a marked canthal stripe; and a sexually dimorphic dorsal pattern consisting of bands (males) or blotches (females). This description brings the number of Dixonius species to ten, with four species endemic to Thailand.

Acanthosaura aurantiacrista (Squamata: Agamidae), a new long horn lizard from northern Thailand.

BACKGROUND: In Thailand, five species of Acanthosaura have been recorded so far, including Acanthosaura armata from the southern region, A. cardamomensis from the eastern region, A. crucigera from the western region, A. lepidogaster from the northern region and A. phuketensis from the Phuket Island and south-western region. However, comprehensive studies of diversity patterns and distribution of Acanthosaura are still lacking in some areas and need further information for designating areas of special conservation importance and nature protection planning in Thailand. NEW INFORMATION: Acanthosaura aurantiacrista is a new species of long-horned lizard of the genus Acanthosaura from northern Thailand. It is distinguished from all other species of Acanthosaura by a dagger-like nuchal spine with yellowish-orange colouration in females, bright yellow colouration in males and a combination of other morphological characters: a greater tail length to snout-vent length ratio; a larger postorbital spine, nuchal spine, dorsal spine and occipital spine compared to its head length; a smaller diastema to snout-vent length ratio; a greater number of subdigital lamellae on the fourth finger and fourth toe; and a larger gular pouch than other Acanthosaura species. Analysis of mitochondrial ND2 gene sequences revealed a sister clade between the A. aurantiacrista lineage and the A. crucigera lineage with a 100% probability of divergence, according to Bayesian analysis and strong support value for Maximum Likelihood analysis. The pairwise distance ranged from 13.8-15.0% between A. aurantiacrista and A. cardamomensis, 10.9-14.5% between A. aurantiacrista and A. crucigera and 0-1.2% amongst A. aurantiacrista populations. The discovery of this lizard increases the known endemic herpetological diversity and underscores the importance of conservation in the mountain rainforest region of northern Thailand.

A striking new genus and species of cave-dwelling frog (Amphibia: Anura: Microhylidae: Asterophryinae) from Thailand.

We report on a discovery of Siamophryne troglodytesGen. et sp. nov., a new troglophilous genus and species of microhylid frog from a limestone cave in the tropical forests of western Thailand. To assess its phylogenetic relationships we studied the 12S rRNA-16S rRNA mtDNA fragment with final alignment comprising up to 2,591 bp for 56 microhylid species. Morphological characterization of the new genus is based on examination of external morphology and analysis of osteological characteristics using microCT-scanning. Phylogenetic analyses place the new genus into the mainly Australasian subfamily Asterophryinae as a sister taxon to the genus Gastrophrynoides, the only member of the subfamily known from Sundaland. The new genus markedly differs from all other Asterophryinae members by a number of diagnostic morphological characters and demonstrates significant mtDNA sequence divergence. We provide a preliminary description of a tadpole of the new genus. Thus, it represents the only asterophryine taxon with documented free-living larval stage and troglophilous life style. Our work demonstrates that S. troglodytesGen. et sp. nov. represents an old lineage of the initial radiation of Asterophryinae which took place in the mainland Southeast Asia. Our results strongly support the "out of Indo-Eurasia" biogeographic scenario for this group of frogs. To date, the new frog is only known from a single limestone cave system in Sai Yok District of Kanchanaburi Province of Thailand; its habitat is affected by illegal bat guano mining and other human activities. As such, S. troglodytesGen. et sp. nov. is likely to be at high risk of habitat loss. Considering high ecological specialization and a small known range of the new taxon, we propose a IUCN Red List status of endangered for it.

A new limestone-dwelling leaf-toed gecko (Gekkonidae: Dixonius) from Khao Sam Roi Yot massif, peninsular Thailand.

We describe Dixonius kaweesaki sp. nov. from Khao Daeng, a limestone mountain in Khao Sam Roi Yot massif, Prachuap Khiri Khan Province, peninsular Thailand. It is diagnosed from all other species by a combination of maximal SVL of 41.6 mm; 12 or 13 longitudinal rows of dorsal tubercles; 24 longitudinal rows of ventrals across the abdomen; a continuous series of 9-11 precloacal pores in males, no pores in females; and two bold dark stripes from the snout to the base of the tail separated by a contrasting light vertebral stripe. It is the eighth species in the genus Dixonius. Lastly, we discuss the type locality of Phyllodactylus paviei, currently regarded as a junior subjective synonym of Dixonius siamensis.

Taxonomic identity of two enigmatic aquatic snake populations (Squamata: Homalopsidae: Cerberus and Homalopsis) from southern Thailand.

In their revision of the homalopsid genus Homalopsis Kuhl & Van Hasselt, Murphy et al. (2012) resurrected H. semizonata Blyth, 1855 and noted that ''Frith (1977) reported on two Homalopsis from Phuket, Thailand with 40 and 42 dorsal scale rows, and 159 and 162 ventrals-scale counts within the range of H. semizonata which is found along the same coast, about 900 km to the north''. Murphy et al. (2012), however, did not list H. semizonata from Thailand, and on their species' distribution map they indicated an interrogation mark along the southern coast of Myanmar and the southwestern coast of peninsular Thailand. It should be noted that Murphy et al. (2012) misread Frith: while one of the two specimens reported by Frith was indeed from Phuket (''from the rocky edge of a stream torrent in good forest east of Thalang, central Phuket Island''), the other was from ''Klong Nakha, 80 kilometeres [sic] south of Ranong in lowland rain forest with some clearings and dwellings'', thus in Ranong Province, closer to the border with Myanmar. Nabhitabhata et al. (2004) recognized a single Homalopsis species in Thailand, H. buccata, which they listed for numerous provinces, including Phuket, based on Frith's (1977) record. Among the two Homalopsis species recognized to occur in Thailand by Nabhitabhata and Chan-ard (2005), H. buccata and H. nigroventralis, none was recorded by them from Phuket Province, but H. buccata was listed from, among others, the neighbouring provinces of Phang-Nga and Ranong. Chuaynkern & Chuaynkern (2012) recognized the same two species, and listed H. buccata from, among others, the provinces of Phang-Nga, Phuket and Ranong. Cox et al. (2012) listed three Homalopsis for Thailand (H. buccata, H. mereljcoxi and H. nigroventralis), and indicated that H. mereljcoxi is the species occurring, a.o., in Phang-Nga, Phuket and Ranong provinces. Wallach et al. (2014) noted that H. semizonata lives in southern Myanmar near sea level, but also that it ''possibly occurs in Phuket''. Chan-ard et al. (2015), in their field guide whose reptile taxonomy is largely outdated (Pauwels & Grismer 2015), recognized only Homalopsis nigroventralis and H. buccata and the map for the latter indicates its presence in Phuket and Phang-Nga provinces. In the most recent synthesis on the family Homalopsidae, Murphy & Voris (2014) made however no mention of the possibility that H. semizonata occurs in Thailand. Because of the lack of voucher material, the identity of the Homalopsis living on the Indian Ocean coastal area of Thailand has thus remained poorly understood so far.

A new Bent-toed Gecko (Squamata: Gekkonidae: Cyrtodactylus) from Phetchaburi Province, Thailand.

A new Bent-toed Gecko, Cyrtodactylus phetchaburiensis sp. nov. is described from the Tha Yang District of Phetchaburi Province, western Thailand. It is a medium-sized Cyrtodactylus (SVL to at least 63.2 mm), with small, mostly keeled tubercles in 20 regular longitudinal rows on dorsum; 33 scales across mid-venter between lowest rows of flank tubercles; enlarged row of femoral scales present; five precloacal pores in male, femoral pores and precloacal groove absent; 5-6 broad basal lamellae and 11 narrow distal lamellae beneath digit IV of pes; and a single median row of transversely enlarged subcaudal scales present. It has a dorsal colour pattern of large, dark, diffusely-edged markings on a fawn background and a pair of dark scapular patches. The species is a member of the Central Indochinese (Thai-Myanmar) clade of Cyrtodactylus and is most closely related to C. oldhami (Theobald), from which it differs in colour pattern.

A new forest-dwelling Bent-toed Gecko (Squamata: Gekkonidae: Cyrtodactylus) from Doi Inthanon, Chiang Mai Province, northern Thailand.

We describe a new forest-dwelling Cyrtodactylus from Doi Inthanon, Chiang Mai Province, northern Thailand. Cyrtodactylus inthanon sp. nov. is characterized by a maximum known SVL of 87.3 mm; 18 to 20 longitudinal rows of dorsal tubercles; a continuous series of 34 to 37 enlarged femoro-precloacal scales, including four to six pitted (female) or pore-bearing (male) scales on each femur separated by a diastema from five pitted (females) or pore-bearing (male) precloacal scales; no precloacal groove or depression; transversely enlarged subcaudal scales; and three to five irregular beige dorsal bands between limb insertions. The discovery of a new reptile endemic to Doi Inthanon reinforces the high importance of this mountain in terms of biodiversity conservation.

A new lowland forest Bent-toed Gecko (Squamata: Gekkonidae: Cyrtodactylus) from Ranong Province, peninsular Thailand.

We describe a new lowland forest-dwelling Cyrtodactylus from Suk Samran District, Ranong Province, southern peninsular Thailand, having a blotched dorsal pattern, a continuous series of poreless enlarged femoral and precloacal scales, 18-20 regularly arranged dorsal tubercle rows, no precloacal groove, no transversely enlarged subcaudal plates and a maximal known snout-vent length of 59.6 mm. Cyrtodactylus ranongensis sp. nov. seems closely related to C. quadrivirgatus, but is readily distinguished from it by having 35-40 ventral scale rows, a reddish iris, heavy dorsal mottling, and lacking longitudinal dark-brown elements in its dorsal pattern. 

Acanthosaura phuketensis (Squamata: Agamidae), a new long-horned tree agamid from southwestern Thailand.

We describe a new lowland forest-dwelling species of the genus Acanthosaura from Phuket Island and the Phuket mountain range in southwestern Thailand. Acanthosaura phuketensis sp. nov., the 11th species in the genus, seems most closely related to A. crucigera from Myanmar and western Thailand and A. cardamomensis from the Cardamom Mountains, but can be differentiated from them by a combination of morphological and coloration characteristics. This new discovery stresses the importance of preserving the last forest patches remaining on Phuket Island, home to three other squamate endemics.