''Pareas berdmorei'', also known as the Mengla snail-eating snake or Berdmore's slug-eating snake, is a non-venomous snake native to

Myanmar Myanmar, officially the Republic of the Union of Myanmar; and also referred to as Burma (the official English name until 1989), is a country in northwest Southeast Asia. It is the largest country by area in Mainland Southeast Asia and has ...

China China, officially the People's Republic of China (PRC), is a country in East Asia. With population of China, a population exceeding 1.4 billion, it is the list of countries by population (United Nations), second-most populous country after ...

Cambodia Cambodia, officially the Kingdom of Cambodia, is a country in Southeast Asia on the Mainland Southeast Asia, Indochinese Peninsula. It is bordered by Thailand to the northwest, Laos to the north, and Vietnam to the east, and has a coastline ...

Vietnam Vietnam, officially the Socialist Republic of Vietnam (SRV), is a country at the eastern edge of mainland Southeast Asia, with an area of about and a population of over 100 million, making it the world's List of countries and depende ...

Laos Laos, officially the Lao People's Democratic Republic (LPDR), is the only landlocked country in Southeast Asia. It is bordered by Myanmar and China to the northwest, Vietnam to the east, Cambodia to the southeast, and Thailand to the west and ...

, and

Thailand Thailand, officially the Kingdom of Thailand and historically known as Siam (the official name until 1939), is a country in Southeast Asia on the Mainland Southeast Asia, Indochinese Peninsula. With a population of almost 66 million, it spa ...

Description

The dorsum of ''P. berdmorei'' is mostly yellow-brown to orange in color with variable dark markings. Thin stripes beginning at the upper

postocular scales In scaled reptiles, the ocular scales are those forming the margin of the eye.Wright AH, Wright AA. 1957. ''Handbook of Snakes''. Comstock Publishing Associates (7th printing, 1985). 1105 pp. . The name originates from the term which is Latin f ...

continue to the

nape The nape is the back of the neck. In technical anatomical/medical terminology, the nape is also called the nucha (from the Medieval Latin rendering of the Arabic , ). The corresponding adjective is ''nuchal'', as in the term ''nuchal rigidity'' ...

, often forming elongated dark markings. Its iris is uniform in color, which may vary from beige to bright red-orange. Its belly is white.

Behaviour

Like the other snakes in its genus, ''P. berdmorei'' is an

oviparous Oviparous animals are animals that reproduce by depositing fertilized zygotes outside the body (i.e., by laying or spawning) in metabolically independent incubation organs known as eggs, which nurture the embryo into moving offsprings kno ...

, semi-

arboreal Arboreal locomotion is the locomotion of animals in trees. In habitats in which trees are present, animals have evolved to move in them. Some animals may scale trees only occasionally (scansorial), but others are exclusively arboreal. The hab ...

nocturnal Nocturnality is a ethology, behavior in some non-human animals characterized by being active during the night and sleeping during the day. The common adjective is "nocturnal", versus diurnality, diurnal meaning the opposite. Nocturnal creatur ...

snail and slug eater.

Distribution and subspecies

''Pareas berdmorei'' is widely distributed across mainland

Indochina Mainland Southeast Asia (historically known as Indochina and the Indochinese Peninsula) is the continental portion of Southeast Asia. It lies east of the Indian subcontinent and south of Mainland China and is bordered by the Indian Ocean to th ...

north of the

Kra Isthmus The Kra Isthmus (, ; ), also called the Isthmus of Kra in Thailand, is the narrowest part of the Malay Peninsula. The western part of the isthmus belongs to Ranong Province and the eastern part to Chumphon Province, both in Southern Thailan ...

, with three major populations and three recognized

subspecies In Taxonomy (biology), biological classification, subspecies (: subspecies) is a rank below species, used for populations that live in different areas and vary in size, shape, or other physical characteristics (Morphology (biology), morpholog ...

. ''Pareas berdmorei berdmorei'' inhabits

northern Vietnam Northern Vietnam or '' Tonkin'' () is one of three geographical regions in Vietnam. It consists of three geographic sub-regions: the Northwest (Vùng Tây Bắc), the Northeast (Vùng Đông Bắc), and the Red River Delta (Đồng Bằng Sôn ...

, northern Laos,

northern Thailand Northern Thailand, or more specifically Lanna, is a region of Thailand. It is geographically characterized by several mountain ranges, which continue from the Shan Hills in bordering Myanmar to Laos, and the river valleys that cut through them. ...

, eastern Myanmar, and southern

Yunnan Yunnan; is an inland Provinces of China, province in Southwestern China. The province spans approximately and has a population of 47.2 million (as of 2020). The capital of the province is Kunming. The province borders the Chinese provinces ...

, China. ''Pareas berdmorei truongsonicus'' inhabits the northern Annanmites (Truong Son) Mountains in

central Vietnam Central Vietnam ( or ), also known as Middle Vietnam or The Middle, formerly known as by the State of Vietnam, by the Republic of Vietnam, or '' Annam'' under French colonial rule, is one of the three geographical regions within Vietnam. Th ...

and Laos. ''Pareas berdmorei unicolor'' inhabits

southern Vietnam Southern Vietnam () is one of the three geographical regions of Vietnam, the other two being Northern and Central Vietnam. It includes 2 administrative subregions, which in turn are divided into 19 ''First Tier units'', of which 17 are provi ...

and adjacent eastern Cambodia.

Etymology

Its specific name refers to the collector of its holotype, Captain Major Thomas Matthew Berdmore (1811–1859).

References

Reptiles described in 1868 berdmorei {{Alethinophidia-stub