A new cryptic species of green pit viper is described from northeast India, based on specimens collected from the state of Mizoram and Meghalaya. The new species is a member of the subgenusViridoviperaand is sister toTrimeresurus medoensisbased on molecular data for mitochondrial cytochrome b gene, whereas resemblesTrimeresurus gumprechtimorphologically. A combination of characters helps delimit the new species from its congeners. Description of the new species highlights the need for dedicated surveys across northeast India to document its reptilian diversity, as this represents the third new species of the genus to be described in the past three years.

A new species of Cyrtodactylus is described herein on the basis of morphological and phylogenetic evidence inferred from the mitochondrial nicotinamide adenine dinucleotide hydride dehydrogenase subunit 2 gene from Mizoram, Northeast India. The new species is distinguished from its congeners by an adult snout-vent length of 62.6–68.6 mm; 10–11 supralabials; 9–11 infralabials; dorsal tubercles rounded, conical to weakly keeled and in 19–20 longitudinal rows; 32–36 paravertebral tubercles between the level of axilla and groin; 32–39 mid-ventral scale rows across the ventral region; 6 precloacal pores in males and 0–6 precloacal pits in females; 14–18 subdigital lamellae under toe IV; no single row of transversely enlarged subcaudal scales; indistinct pattern of alternating dark brown blotches on the dorsum of the body. Morphologically and genetically, the new species is recovered as the sister species to C. aaronbaueri, but is genetically distinct by an uncorrected p-distance of 0.099–0.1, and morphologically in the number of precloacal pores, mid-ventral scale rows, paravertebral tubercles on the trunk, dorsal tubercle rows, dorsal spot, and subdigital lamellae on pes. http://www.zoobank.org/urn:lsid:zoobank.org:pub:8E9144FA-EFAF-4C7D-B64F-667706643EC5

Based on morphology and ND2 gene sequences, four new species of Cyrtodactylus, two each from the Indian states of Meghalaya and Mizoram are described herein. The new species are a part of the Cyrtodactylus khasiensis group. The species from Meghalaya represent the lowland clade whereas the species from Mizoram represent the highland clade within the south of Brahmaputra clade of Indo-Burmese Cyrtodactylus. The two distinct populations from Meghalaya are sister to one another, differing from each by an uncorrected p-distance 0.065 and collectively are sister to Cyrtodactylus septentrionalis. The species from Mizoram differ from each other by an uncorrected p-distance of 0.085–0.121 and collectively are sister to Cyrtodactylus montanus.

We describe two new species of Cyrtodactylus Gray, 1827, each from the Indian states of Meghalaya and Mizoram based on morphology and ND2 gene sequences. The new species are a part of the Cyrtodactylus khasiensis group. Both species represent the highland clade within the south of Brahmaputra clade of Indo-Burmese Cyrtodactylus. Based on ND2 gene sequence, the species from Meghalaya have an uncorrected p-distance of 4.21%–4.25% from a lowland species C. guwahatiensis Agarwal, Mahony, Giri, Chaitanya & Bauer, 2018 and is a sister taxon to C. septentrionalis Agarwal, Mahony, Giri, Chaitanya & Bauer, 2018. The species from Mizoram differ from its sister species C. bengkhuaiai Purkayastha, Lalremsanga, Bohra, Biakzuala, Decemson, Muansanga, Vabeiryureilai, Chauhan & Rathee, 2021 by a p-distance of 8.33%.

Herein we describe a new species of Cyrtodactylus from Lunglei District in the state of Mizoram, India. Based on morphology and ND2 gene sequences, the species was found to be a member of the Cyrtodactylus khasiensis group. The species can be identified by its moderate size (adult SVL 64.9–75.1 mm) with rounded, bluntly conical and feebly keeled dorsal tubercles in 24–28 longitudinal rows; 32–40 paravertebral tubercles between the level of the axilla and the level of the groin; 37–43 mid-ventral scale rows; 3–5 precloacal pores in males and 5–7 pitted precloacal scales in females; 16–18 subdigital lamellae under IV toe; no single row of transversely enlarged subcaudal scales; dorsal markings are dark brown, irregular and distinct; tail with alternating dark and light bands.

A new species of Cyrtodactylus is described from Vairengte town, situated in the Kolasib District of Mizoram State, north-eastern India. The new species is found to be a member of Indo-Burman Cyrtodactylus khasiensis clade based on ND2 gene sequences and morphological parameters, such as number of precloacal pores, mid-ventral scale rows, paravertebral tubercles on the trunk, dorsal tubercle rows, subdigital lamellae on pes and subcaudal scalation, making it the sixth endemic Cyrtodactylus from Mizoram and twenty second from north-east India. Moreover, phylogenetic evidence suggests the new species to be sister to the recently described C. aaronbaueri, and morphological analyses also reveal marginal separation between the two species based on the PCA of infralabials, lamellae on fingers and toes, paravertebral tubercles on the trunk, and dorsal tubercle rows.