Angel’s Keelback – Rhabdophis angeli – (Bourret, 1934)

Science name: Rhabdophis angeli – (Bourret, 1934)

Taxonomic:  Animalia>> Chordata>> Reptilia>> Squamata >> Colubridae >> angeli

Species status: Endemic ; IUCN status: LC (Least Concern)

Description:

Physical Characteristics:

Scales: Rhabdophis angeli has 15 rows of dorsal scales throughout its body, which distinguishes it from closely related species like R. nuchalis, which has 17 rows.
Ventrals and Subcaudals: The snake has 117–126 ventral scales and 39–46 subcaudal scales, both of which are fewer in number compared to R. nuchalis.
Coloration and Appearance:
Specific coloration patterns for Rhabdophis angeli are not well-documented. However, species in the genus Rhabdophis are often characterized by their keeled scales, which give them a rough texture and enhance their camouflage in forested environments.

Distribution and habitat:

Elevation:
The exact elevation at which Rhabdophis angeli has been recorded is not well documented. However, its habitat in the Tam Dao region suggests that it likely occurs in montane environments typical of northern Vietnam.

Area:
Rhabdophis angeli, commonly known as Angel’s Keelback, is currently known from northern Vietnam, particularly in Tam Dao, located in Vinh Phuc Province, and from Ky Phu in Thai Nguyen Province. These regions are characterized by dense montane evergreen forests. It is unclear whether the species is found outside these areas, and its overall range remains poorly understood.

Habitat:
This species is typically associated with montane evergreen forests in subtropical regions, where it may inhabit both terrestrial and semi-aquatic environments. The presence of streams and other freshwater sources in the forest likely plays a significant role in its ecology, as many species in the genus Rhabdophis are known to exhibit semi-aquatic behavior.

Behaviour and ecology:

Lifestyle:
Rhabdophis angeli is likely semi-aquatic, similar to other species in its genus. It may spend time in or near freshwater sources, such as streams, within the montane evergreen forests where it has been found. This species is expected to exhibit behaviors typical of Rhabdophis species, including foraging in both terrestrial and aquatic environments for small prey, such as amphibians and fish.

Reproduction:
Like other members of its genus, Rhabdophis angeli is oviparous, laying eggs, though specific reproductive behaviors have not been recorded for this species.

Conservation and status:

IUCN Red List Category and Criteria:
Rhabdophis angeli is classified as Data Deficient on the IUCN Red List, primarily due to the lack of comprehensive data on its population size, distribution, and ecology. The last assessment occurred in 2011, and an updated evaluation is needed to better understand the conservation needs of this species.

Population Trend:
There is no data available on the population trend of Rhabdophis angeli. Its population is not well studied, and further research is needed to determine whether it is stable or in decline.

Threats:
Potential threats to Rhabdophis angeli include habitat loss and deforestation, particularly in the montane forests where it resides. These forests may be impacted by agricultural expansion, logging, or other human activities, which could reduce the quality of its habitat.

Conservation Actions:
Currently, no specific conservation actions are in place for Rhabdophis angeli. However, the species may benefit from general forest conservation efforts in the regions where it is found. Further research is required to determine its ecological needs, population trends, and potential threats to inform future conservation planning.

Etymology
Rhabdophis angeli is named in honor of Fernand Angel (1881–1950), a French herpetologist who made significant contributions to the study of reptiles.