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Search tool	Example of search string in box	What that means to the database
* = "wildcard". Allows a partial letter string to be entered and implies either no or various extension on this letter string	Hyl*	Will find all uses of "Hyl . . ." anywhere in a record: e.g., Hylarana, Hyla, Hylidae, Hylinae, Hylaedactyla.
* = "wildcard". Allows a partial letter string to be entered and implies either no or various extension on this letter string	*Hyla	Will find all uses of ". . . hyla" anywhere in a record: e.g., Hyla, Hylidae, Plectrohyla, Ptychadena hylaea, Adenomera hylaedactyla
Single word	Hyla	Will find all records that contain stand-alone uses of Hyla: e.g., Hyla, Hyla arenicolor
Strings of words without quotation marks	Lithobates pipiens	Interprets this as "Lithobates OR pipiens" so will find the union of all records that contain either "Lithobates" or "pipiens": e.g., Lithobates omiltemanus, Hylorana pipiens
Strings of word with quotation marks	"Lithobates pipiens"	Interprets this as "Lithobates AND pipiens" so will return all records that have the character string "Lithobates pipiens" anywhere within a record: e.g., all members of the Lithobates pipiens complex.
AND statement. Means that the results of the search must include both words held together by an AND	Lithobates AND pipiens	Same as "Lithobates pipiens"
OR statement. Means that the results of the search will all records that have either of the terms held together by an OR	Lithobates OR "Costa Rica"	Recovers all records that contain the word "Lithobates" or "Costa Rica": 402 records inasmuch as this will include all records for the entire amphibian fauna of Costa Rica
Combining Boolean operators within the Basic Search box (AND, OR, NOT, quotation marks)	Lithobates AND "Costa Rica" NOT forreri	Recovers only records that contain the word Lithobates AND "Costa Rica", but excludes any record that contains the word "forreri" in any part of the record: 9 records
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Hylarana mortenseni (Boulenger, 1903)

Class: Amphibia > Order: Anura > Family: Ranidae > Genus: Hylarana > Species: Hylarana mortenseni

Rana Mortenseni Boulenger, 1903, Ann. Mag. Nat. Hist., Ser. 7, 12: 219. Syntypes: ZMUC, by original designation. BMNH 1947.2.2.12–13 (originally 1903.2.21.27), presumably on exchange from ZMUC are syntypes according to museum records. ZMUC R072735, designated lectotype by Sheridan and Stuart, 2018, PLoS One, 13(3: e0192766): 16. Type locality: "Koh Chang Island, in Siam [Thailand]". Synonymy with Rana nigrovittata by Smith, 1922, J. Nat. Hist. Soc. Siam, 4: 212. Removed from synonymy; without discussion, by Dubois, 1992, Bull. Mens. Soc. Linn. Lyon, 61: 326. Ohler, Swan, and Daltry, 2002, Raffles Bull. Zool., 50: 475, disputed the synonymy but did not provide evidence.

Rana (Hylorana) mortenseni — Boulenger, 1920, Rec. Indian Mus., 20: 123.

Rana (Sylvirana) mortenseni — Dubois, 1992, Bull. Mens. Soc. Linn. Lyon, 61: 326.

Hylarana mortenseni — Chen, Murphy, Lathrop, Ngo, Orlov, Ho, and Somorjai, 2005, Herpetol. J., 15: 237, by implication; Che, Pang, Zhao, Wu, Zhao, and Zhang, 2007, Mol. Phylogenet. Evol., 43: 3; by implication; Dubois, Ohler, and Pyron, 2021, Megataxa, 5: 549, by implication. .

Sylvirana mortenseni — Frost, Grant, Faivovich, Bain, Haas, Haddad, de Sá, Channing, Wilkinson, Donnellan, Raxworthy, Campbell, Blotto, Moler, Drewes, Nussbaum, Lynch, Green, and Wheeler, 2006, Bull. Am. Mus. Nat. Hist., 297: 370; Fei, Ye, and Jiang, 2010, Herpetol. Sinica, 12: 34; Oliver, Prendini, Kraus, and Raxworthy, 2015, Mol. Phylogenet. Evol., 90: 191.

Hylarana (Sylvirana) mortenseni — Fei, Ye, Jiang, and Xie, 2008, Acta Zootaxon. Sinica, 33: 206.

Hylarana (Pterorana) mortenseni — Wu, Xu, Suwannapoom, Nguyen, Murphy, Papenfuss, Lathrop, Kilunda, Gao, Yuan, Chen, Zhang, Zhao, Wang, Rahman, Nneji, Zhao, Wang, Jin, Zhang, and Che, 2024 "2025", Mol. Phylogenet. Evol., 108223: 1–11, by implication.

Common Names

Mortensen's Stream Frog (Stuart, Seateun, Sivongxay, and Phimmachak, 2025 "2024", in Wildlife Lao PDR: 42).

Koh Chang Island Frog (Frank and Ramus, 1995, Compl. Guide Scient. Common Names Amph. Rept. World: 108).

Mortensen's Frog (Chan-ard, 2003, Photograph. Guide Amph. Thailand: 132).

Distribution

Southeastern and eastern Thailand through central Laos (northern lowlands in Bolikhamxai Province, 300 m elevation, and southern lowlands in Champasak Province, 60–100 m) and southwestern and northern and central Cambodia, below 800 m elevation.

Geographic Occurrence

Natural Resident: Cambodia, Laos, Thailand

Comment

Prior to the revision of Frost, Grant, Faivovich, Bain, Haas, Haddad, de Sá, Channing, Wilkinson, Donnellan, Raxworthy, Campbell, Blotto, Moler, Drewes, Nussbaum, Lynch, Green, and Wheeler, 2006, Bull. Am. Mus. Nat. Hist., 297, placed in the Section Hylarana, subsection Hydrophylax, subgenus Sylvirana of Dubois, 1992, Bull. Mens. Soc. Linn. Lyon, 61: 326. See comment under Rana nigrovittata. Reported for southwestern Cambodia by Ohler, Swan, and Daltry, 2002, Raffles Bull. Zool., 50: 465–481. Chan-ard, 2003, Photograph. Guide Amph. Thailand: 132–133, provided a very brief account, map for Thailand, and photograph. Stuart and Emmett, 2006, Fieldiana, Zool., N.S., 109: 10, provided records for the Cadamom Mountains, southwestern Cambodia, and noted differences in observations from those made previously of this species by Ohler et al. (2002). Neang and Holden, 2008, Field Guide Amph. Cambodia: 82, provided a photograph, brief account of identification, ecology, and range in Cambodia. Fei, Ye, Jiang, and Xie, 2008, Acta Zootaxon. Sinica, 33: 199–206, provided a key to the close relatives of this species. See statement of geographic range, habitat, and conservation status (as Rana mortenseni) in Stuart, Hoffmann, Chanson, Cox, Berridge, Ramani, and Young, 2008, Threatened Amph. World: 633. Chan-ard, Cota, and Makchai, 2011, Amph. E. Region Thailand: 106–107, provided a photograph and brief account for the Eastern Region of Thailand, and (p. 146) detailed the range in Thailand. See account by Sheridan and Stuart, 2018, PLoS One, 13(3: e0192766): 16–23. See comments by Geissler, Hartmann, Ihlow, Neang, Seng, Wagner, and Böhme, 2019, Cambodian J. Nat. Hist., 2019: 40–63, on specimens collected in Phnom Kulen National Park, northern Cambodia. Niyomwan, Srisom, and Pawangkhanant, 2019, Field Guide Amph. Thailand: 378–379, provided a brief account (description, photographs, habitat, and range) for Thailand (in Thai). Stuart, Seateun, Sivongxay, and Phimmachak, 2025 "2024", in Wildlife Lao PDR: 42, summarized literature, taxonomy, habitat, and detailed range for Laos.

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For access to general information see Wikipedia
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For images search CalPhoto Images and Google Images
To search the NIH genetic sequence database, see GenBank
For additional information see AmphibiaWeb report
For information on conservation status and distribution see the IUCN Redlist
For information on distribution, habitat, and conservation see the Map of Life
For related information on conservation and images as well as observations see iNaturalist