Hyloscirtus tolkieni Sánchez-Nivicela, Falcón-Reibán & Cisneros-Heredia, 2023
Accepted species in Catalogue of Life’s 11 September 2026 base release. This preserves the source classification and available supporting data; it is not a completed species monograph.
Holotype of Hyloscirtus tolkieni in life. a fronto-lateral view b lateral view of head c frontal view d dorso-lateral view
Juan C. Sánchez-Nivicela · CC BY 4.0 · Image sourceProvider-generated thumbnail requested at 800 pixels; no local editing Local WebP display rendition; resized without cropping.
Open encyclopedia reference
Hyloscirtus tolkieni, commonly known as the Río Negro stream frog, is a recently described (2023) species of frog in the family Hylidae. It is endemic to the Andes Mountains in Ecuador, where it has been observed at 3190 meters above sea level. The adult female frog measures 64.9 mm in snout-vent length. It is gray-green in color with yellow and black marks. The iris of the eye is pink with a black rim. There are yellow and black spots on the belly and flanks. It has some fringed skin on the front and back toes. These frogs live in riparian habitats. The tadpoles live in cracks in the rocks underwater, within streams of the Rio Negro-Sopladora National Park. The adult frogs appear nocturnal animals. Scientists have seen them on high tree branches not far from the water. The scientists who published the first description of this species [Juan C. Sánchez-Nivicela, José M. Falcón-Reibán, and Diego F. Cisneros-Heredia] named this frog after author J.R.R.
Wikipedia contributors, Hyloscirtus tolkieni; see linked history · CC BY-SA 4.0 . Plain-text lead excerpt, at most 180 words; no infobox or later sections Retrieved 2026-10-05T16:28:19.044088+00:00. This reference remains separate from the taxonomic record.
Identity & source status
- Scientific name
- Hyloscirtus tolkieni Sánchez-Nivicela, Falcón-Reibán & Cisneros-Heredia, 2023
- Name authority
- Sánchez-Nivicela, Falcón-Reibán & Cisneros-Heredia, 2023
- Rank
- species
- Accepted status
- accepted
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Amphibia
- Order
- Anura
- Family
- Hylidae
- Genus
- Hyloscirtus
- Extinction status
- Recorded extant
Classification family tree
Nested taxonomic groups from the source. This is not a direct-ancestor chain, a dated evolutionary tree or a phylogenetic reconstruction.
- domainEukaryota (Chatton, 1925) Whittaker & Margulis, 1978
- kingdomAnimalia
- phylumChordata
- subphylumVertebrata
- infraphylumGnathostomata
- parvphylumOsteichthyes
- megaclassTetrapoda
- classAmphibia
- orderAnura
- familyHylidae Rafinesque, 1815
- genusHyloscirtus Peters, 1882
- speciesHyloscirtus tolkieni Sánchez-Nivicela, Falcón-Reibán & Cisneros-Heredia, 2023
Close classified relatives
These entries share the source’s genus, Hyloscirtus. They are not necessarily the closest relatives established by molecular evidence.
Source literature & publication evidence
References attached to this source record, including nomenclatural citations where supplied. This is a selected bibliography; abbreviated citations remain in the source’s form.
- https://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=1270215 Source fields: Taxon.tsv dwc:namePublishedIn, Taxon.tsv dcterms:references
Origins, evidence & remaining research
Name authority and publication references document nomenclature where the source supplies it. They do not establish evolutionary origins or the earliest fossil occurrence.
Specimen-level evidence, morphology, ecological research, phylogenetic studies, a comprehensive bibliography and a located literary passage have not yet been compiled for this record.
Dataset citation & attribution
This exact taxon in ChecklistBank · Catalogue of Life 2026-09-11
Catalogue of Life 2026-09-11; dataset 316321; doi:10.48580/dgz5n. https://creativecommons.org/licenses/by/4.0/ . Retrieved 5 October 2026.
Stable key: col:PYZYF. Classification follows source parent identifiers. English common names may vary by region.