Citation: Midtgaard, Rune. RepFocus - A Survey of the Reptiles of the World. (www.repfocus.dk).
Latest update: May 26th, 2024.
 
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Genus
Homalopsis
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Masked Water Snakes, Puff-faced Water Snakes
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Boa-Wassertrugnattern
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Maskevandsnoge, Boaflodslanger
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1822 |  |
Homalopsis Kuhl & Hasselt (type species: Coluber horridus Daudin 1803) |
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1859 | |
Pythonia Blyth (type species: Homalopsis semizonata Blyth 1855; syn. Murphy 2007) |
Contents:
5 species, none of which are endemic.
Endemism: 0%  100%
Remarks:
Although the genus has been reported from China (e.g., Gyi 1970, as buccata), it appears to be absent from the country (Zhao & Adler 1993; Murphy 2007).
Distribution:
S. Asia, Malay Archipelago.
Reported from:
Bangladesh,
Cambodia,
India,
Indonesia
(Bangka,
Belitung,
Java,
Kalimantan,
Natuna Islands,
Riau Islands,
Sumatra),
Laos,
Malaysia
(Sabah,
Sarawak,
West Malaysia
[incl.
Langkawi Archipelago]),
Myanmar,
Nepal,
Singapore,
Thailand,
Vietnam.
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Homalopsis buccata
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Malayan Masked Water Snake, Puff-faced Water Snake, Banded Swamp Snake, Asian False Water Boa, (Linne's Water Snake)
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Malayische Boa-Wassertrugnatter
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Malayisk Maskevandsnog
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1758 | |
Coluber buccatus Linnaeus |
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Vipera buccata Daudin 1803 |
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Homalopsis buccata Schlegel 1837 |
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1758 | |
Coluber monilis Linnaeus (Murphy, Voris, Murthy, Traub & Cumberbatch 2012) |
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Homalopsis monilis Boie 1827 |
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1803 | |
Coluber horridus Daudin (Murphy, Voris, Murthy, Traub & Cumberbatch 2012) |
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Homalopsis horridus Kuhl & van Hasselt 1822 |
Remarks:
Presence in Sulawesi needs confirmation, since only a single voucher specimen is available from the island (De Lang & Vogel 2005).
Introduced to:
Indonesia
(Sulawesi).
Distribution:
Indonesia
(Bangka,
Belitung,
Java,
Kalimantan,
Natuna Islands,
Riau Islands,
Sumatra),
Laos,
Malaysia
(Sabah,
Sarawak,
West Malaysia
[incl.
Langkawi Archipelago]),
Singapore,
Thailand.
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Homalopsis buccata
© Henrik Bringsøe
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Homalopsis hardwickii
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Northwestern Masked Water Snake, (Hardwick's Water Snake)
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Nordvestliche Boa-Wassertrugnatter
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Nordvestlig Maskevandsnog
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1842 | |
Homalopsis hardwickii Gray |
Remarks:
Previously regarded as a synonym of buccata (e.g., Murphy 2007). Revalidated as a separate species by Murphy, Voris, Murthy, Traub & Cumberbatch (2012). Distribution of hardwickii is uncertain; it is possibly restricted to Northeast India. The type specimen came from "India", but the locality is questionable, and other voucher specimens also have questionable locality data or are anecdotal, hence there are no known extant population (Murphy, Voris, Murthy, Traub & Cumberbatch 2012). Also a single record from Nepal (as buccata) needs confirmation (Kästle, Rai & Schleich 2013). Whitaker & Captain (2004) did not consider it an Indian species. However, until further knowledge is obtained, reports of Homalopsis from Bangladesh, India, and Nepal are tentatively regarded as hardwickii.
Distribution:
Bangladesh,
India,
Nepal.
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Homalopsis mereljcoxi
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Thai Masked Water Snake, (Jack's Water Snake)
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Thailändische Boa-Wassertrugnatter
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Thailandsk Maskevandsnog
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2012 | |
Homalopsis mereljcoxi Murphy, Voris, Murthy, Traub & Cumberbatch |
Distribution:
Cambodia,
Laos,
Thailand,
Vietnam.
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Homalopsis mereljcoxi
© Rune Midtgaard
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Homalopsis nigroventralis
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Mekong Masked Water Snake, Cambodian Puff-faced Water Snake, (Deuve's Water Snake)
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Mekong-Boa-Wassertrugnatter
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Mekong-maskevandsnog
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1970 | |
Homalopsis buccata nigroventralis Deuve |
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Homalopsis nigroventralis Stuart, Sok & Neang 2006 |
Distribution:
Cambodia,
Laos,
Thailand.
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Homalopsis semizonata
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Burmese Masked Water Snake, Martaban Water Snake
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Burmesische Boa-Wassertrugnatter
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Burmesisk Maskevandsnog
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1855 | |
Homalopsis semizonata Blyth |
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Pythonia semizonata Blyth 1859 |
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Pythonella semizonata [lapsus for Pythonia] Carlleyle 1869 |
Remarks:
Previously regarded as a synonym of buccata (e.g., Murphy 2007). Revalidated as a separate species by Murphy, Voris, Murthy, Traub & Cumberbatch (2012). Reports of buccata from the Thai Andaman coast (e.g., Frith 1977) may also refer to semizonata (Murphy, Voris, Murthy, Traub & Cumberbatch 2012).
Distribution:
Myanmar,
Thailand.
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