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
	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
Printable HELP file

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
Printable HELP file

Osteocephalus yasuni Ron and Pramuk, 1999

Class: Amphibia > Order: Anura > Family: Hylidae > Genus: Osteocephalus > Species: Osteocephalus yasuni

Osteocephalus yasuni Ron and Pramuk, 1999, Herpetologica, 55: 435. Holotype: QCAZ 11336, by original designation. Type locality: "at the Yasuní Scientific Research Station (76° 24′ 19″ W, 00° 04′ 32″ S; altitude 230 m), Provincia del Napo, Ecuador".

Common Names

Yasuní Spiny-backed Treefrog (Coloma and Duellman, 2025, Amph. Ecuador. Vol. 2: xxxiv).

Rana Espinosa de Yasuní (Spanish: Coloma and Duellman, 2025, Amph. Ecuador. Vol. 2: xxxiv).

Distribution

Upper Amazon Basin in Ecuador within a latitudinal range encompassed by the Rio Napo to the north and the Rio Yasuni to the south; also known from two localities near Iquitos, Departamento Loreto, in northeastern Peru, Ucayali Department in Amazonian central Peru, as well as in adjacent Amazonas, Colombia, and Acre in the southwestern part of Brazilian Amazonia, all localities 180–331 m elevation.

Geographic Occurrence

Natural Resident: Brazil, Colombia, Ecuador, Peru

Comment

Colombia record provided by Lynch, 2002, Rev. Acad. Colomb. Cienc. Exact. Fis. Nat., 26: 289–292. Cisneros-Heredia, 2007, Herpetozoa, Wien, 19: 183, provided a record from Tiputini Biodiversity Station, 31 km east of the type locality and discussed aspects of the diagnosis. Cisneros-Heredia, 2007, Herpetozoa, Wien, 19: 183, provided a new record and documented ontogenetic changes in coloration. In the Osteocephalus leprieurii species group of Jungfer, Faivovich, Padial, Castroviejo-Fisher, Lyra, Berneck, Iglesias, Kok, MacCulloch, Rodrigues, Verdade, Torres-Gastello, Chaparro Auza, Valdujo, Reichle, Moravec, Gvoždík, Gagliardi-Urrutia, Ernst, De la Riva, Means, Lima, Señaris Vasquez, Wheeler, and Haddad, 2013, Zool. Scripta, 42: 351–380, who also provided a record from Acre, Brazil. Moravec, Arista-Tuanama, Gagliardi-Urrutia, and Gvoždík, 2016, Acta Soc. Zool. Bohem., 80: 317–341, provided the records from the department of Ucayali, Amazonian Peru. Metcalf, Marsh, Torres Pacaya, Graham, and Gunnels, 2020, Herpetol. Notes, 13: 753–767, reported the species from the Santa Cruz Forest Reserve, Loreto, northeastern Peru. Crnobrna, Santa-Cruz Farfan, Gallegos, López-Rojas, Llanqui, Panduro Pisco, and Kelsen Arbaiza, 2023, Check List, 19: 444, provided a record from Ucayali Department, central-eastern Peru. Coloma and Duellman, 2025, Amph. Ecuador. Vol. 2: 486–488, provided an account, with photographs, which summarized identification, adult morphology, systematics, natural history, distribution (including a dot map for Ecuador), conservation, and (on pp. 594–595) the advertisement call.

External links:

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For access to general information see Wikipedia
For additional sources of general information from other websites search Google
For access to relevant technical literature search Google Scholar
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 related information on conservation and images as well as observations see iNaturalist
For additional information specific to Ecuador see FaunaWebEcuador: Anfibios del Ecuador