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

Chiasmocleis antenori (Walker, 1973)

Class: Amphibia > Order: Anura > Family: Microhylidae > Subfamily: Gastrophryninae > Genus: Chiasmocleis > Species: Chiasmocleis antenori

Syncope antenori Walker, 1973, Occas. Pap. Mus. Nat. Hist. Univ. Kansas, 20: 3. Holotype: KU 124009, by original designation. Type locality: "Puerto Libre, Río Aguarico, 570 m, Provincia Napo, Ecuador".

Chiasmocleis antenori — Peloso, Sturaro, Forlani, Gaucher, Motta, and Wheeler, 2014, Bull. Am. Mus. Nat. Hist., 386: 33.

Chiasmocleis (Syncope) antenori — de Sá, Tonini, van Huss, Long, Cuddy, Forlani, Peloso, Zaher, and Haddad, 2018 "2019", Mol. Phylogenet. Evol., 130: 206.

Common Names

Antenor's Snouted Frog (Coloma and Duellman, 2025, Amph. Ecuador. Vol. 2: xxxiv).

Ranita Hocicuda de Antenor (Spanish: Coloma and Duellman, 2025, Amph. Ecuador. Vol. 2: xxxiv).

Ecuador Silent Frog (Frank and Ramus, 1995, Compl. Guide Scient. Common Names Amph. Rept. World: 93).

Distribution

Amazonian Ecuador in the Provinces of Orellana, Pastaza, Morona Santiago, Zamora Chinchipe, Napo, and Sucumbíos, Ecuador, 223_1305 m elevation; Amazonian Peru in the provinces of Huánuco, Loreto, San Martín, Cusco and Madre de Dios; adjacent Acre, Brazil; expected in Amazonian Colombia.

Geographic Occurrence

Natural Resident: Brazil, Ecuador, Peru

Likely/Controversially Present: Colombia

Comment

von May, Santa-Cruz Farfan, and Jennings, 2007, Herpetol. Rev., 38: 476, provided a record from Madre de Dios, Peru. Duellman, 1978, Misc. Publ. Mus. Nat. Hist. Univ. Kansas, 65: 192–127, provided a brief account including characterization. Rodríguez and Duellman, 1994, Univ. Kansas Mus. Nat. Hist. Spec. Publ., 22: 76, provided a brief account for the Iquitos region of northeastern Peru. Krügel and Richter, 1995, Copeia, 1995: 955–963, reported on larval morphology. Bernarde, Machado, and Turci, 2011, Biota Neotrop., 11: 117–144, reported specimens from Reserva Extrativista Riozinho da Liberdade, Acre, Brazil. Morales and Vargas, 2003, Herpetol. Rev., 34: 203–206, reported on vocalization. Peloso, Sturaro, Forlani, Gaucher, Motta, and Wheeler, 2014, Bull. Am. Mus. Nat. Hist., 386: 33–34, provided an account and implied some controversy over the identity of some Peruvian records as well as placing it in the Chiasmocleis hudsoni clade. See brief account for the Manu region, Peru, by Villacampa-Ortega, Serrano-Rojas, and Whitworth, 2017, Amph. Manu Learning Cent.: 242–243. Coloma and Duellman, 2025, Amph. Ecuador. Vol. 2: 18–20, provided an account with photographs which summarized identification, adult and larval morphology, systematics, natural history, distribution (including a dot map for Ecuador), and conservation.

External links:

Please note: these links will take you to external websites not affiliated with the American Museum of Natural History. We are not responsible for their content.

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