Alcalus pullus (Smith, 1921)

Class: Amphibia > Order: Anura > Family: Ceratobatrachidae > Subfamily: Alcalinae > Genus: Alcalus > Species: Alcalus pullus

Rana pullus Smith, 1921, J. Fed. Malay States Mus., 10: 197. Syntypes: BMNH (11 specimens), by original designation; this being BMNH 1947.2.2.69–84 (formerly 1921.4.1.238–253) according to museum records. Type locality: "Tasan, 25 miles S. W. Chumporn, Peninsular Siam [Thailand]". Not preoccupied by Rana gracilis var. pulla Stoliczka, 1870, by reason of being a noun in apposition, according to Ohler, 2023, Bionomina, 35: 51. 

Rana tasanae Smith, 1921, J. Nat. Hist. Soc. Siam, 4: 193. Replacement name for Rana pullus Smith, 1921.

Rana (Discodeles) tasanaeSmith, 1930, Bull. Raffles Mus., 3: 102; Bourret, 1942, Batr. Indochine: 376.

Discodeles tasanae — Bourret, 1942, Batr. Indochine: 99.

Ingerana (Ingerana) tasanaeDubois, 1987 "1986", Alytes, 5: 65.

Alcalus tasanae — Yan, Jiang, Jin, Suwannapoom, Li, Vindum, Brown, and Che, 2016, Zool. Res., Kunming, 37: 11–12. 

Alcalus pullus — Ohler, 2023, Bionomina, 35: 51. Demonstration that the species name is a noun in apposition. 

English Names

Tasan Eastern Frog (Frank and Ramus, 1995, Compl. Guide Scient. Common Names Amph. Rept. World: 99).

Tha San Frog (Nutphund, 2001, Amph. Thailand: 102).

Tasan Frog (Chan-ard, 2003, Photograph. Guide Amph. Thailand: 112).

Tha San Dwarf Cascadefrog (Zug and Mulcahy, 2020 "2019", Amph. Rept. S. Tanintharyi: 30). 

Tasan Dwarf Frog (Poyarkov, Nguyen, Popov, Geissler, Pawangkhanant, Neang, Suwannapoom, and Orlov, 2021, Russ. J. Herpetol., 28 (3A): 21). 

Tasan Dwarf Cascadefrog (Zug, 2022, Smithson. Contrib. Zool., 653: 16).


Southeastern mainland Myanmar (Kayah, Kayin) and southern peninsular Myanmar (Mon, Tanintharyi) into northern (Kachin), western (Kanchanaburi) and central peninsular Thailand (Chumphon, Ranong, Surat Thani, and Phag Nga provinces).

Geographic Occurrence

Natural Resident: Myanmar, Thailand


Closely related to Rana beddomii according to the original publication. See comment under Rana beddomii. Discussed by Bourret, 1942, Batr. Indochine: 376–377. See account by Taylor, 1962, Univ. Kansas Sci. Bull., 43: 456–459. Nutphund, 2001, Amph. Thailand: 102, provided a brief characterization (as Rana tasanae) and photograph (which Ohler, 2003, Alytes, 21: 101, did not consider identifiable beyond the association with the genus Limnonectes). Chan-ard, 2003, Photograph. Guide Amph. Thailand: 112–113, provided a very brief account, map for Thailand, and photograph. See photograph, map, description of geographic range and habitat, and conservation status in Stuart, Hoffmann, Chanson, Cox, Berridge, Ramani, and Young, 2008, Threatened Amph. World: 481. Chan-ard, Cota, and Makchai, 2011, Amph. E. Region Thailand: 133, detailed the distribution in Thailand. Yan, Jiang, Jin, Suwannapoom, Li, Vindum, Brown, and Che, 2016, Zool. Res., Kunming, 37: 9, reported the species from Kachin and Tanintharyi states, Myanmar. Mulcahy, Lee, Miller, Chand, Thura, and Zug, 2018, ZooKeys, 757: 85–162, a record from Tanintharyi Division, Myanmar. Niyomwan, Srisom, and Pawangkhanant, 2019, Field Guide Amph. Thailand: 308–309, provided a brief account (description, photographs, habitat, and range) for Thailand (in Thai). Zug and Mulcahy, 2020 "2019", Amph. Rept. S. Tanintharyi: 30–31, provided a brief account for South Tanintharyi, peninsular Myanmar. Zug, 2022, Smithson. Contrib. Zool., 653: 16, discussed identification, habitat, and range in Myanmar. 

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