NATURAL HISTORY · CATALOGUE RECORD
Rio Mayo Titi
Plecturocebus oenanthe (Thomas, 1924)
Source-backed taxonomic record
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.
Open encyclopedia reference
The Rio Mayo titi monkey (Plecturocebus oenanthe) is a species of titi monkey, a type of New World monkey, endemic to Peru. The Rio Mayo titi, was thought previously to have a small range of origin in the Alto Mayo valley, but research has proven that the range extends southward and reaches the Bajo Mayo and Huallaga Central. It had been classified as vulnerable but due to major habitat loss and restricted living space, it is now classified as Critically Endangered. In October 2012, it was included in The World's 25 Most Endangered Primates list. An increase in deforestation is leading to the decrease in available living space for this titi monkey, forcing it to live in sympatry with another species of Callicebus. Yet in some areas, such drastic deforestation has resulted in extremely high population density. The Rio Mayo titi is better adapted to moderately populated areas, thus overpopulation negatively impacts the species. The forests the Rio Mayo titi lives in are being destroyed for agricultural purposes, leaving little forest for the monkeys.
Wikipedia contributors, Rio Mayo titi monkey; see linked history · CC BY-SA 4.0 . Plain-text lead excerpt, at most 180 words; no infobox or later sections Retrieved 2026-10-05T08:05:11.743990+00:00. This reference remains separate from the taxonomic record.
Identity & source status
- Scientific name
- Plecturocebus oenanthe (Thomas, 1924)
- Name authority
- (Thomas, 1924)
- Common name
- Rio Mayo Titi
- Rank
- species
- Accepted status
- accepted
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Mammalia
- Order
- Primates
- Family
- Pitheciidae
- Genus
- Plecturocebus
- 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
- classMammalia Linnaeus, 1758
- subclassTheria Parker & Haswell, 1897
- infraclassEutheria Gill, 1872
- orderPrimates Linnaeus, 1758
- suborderHaplorrhini Pocock, 1918
- infraorderSimiiformes Haeckel, 1866
- familyPitheciidae Mivart, 1865
- subfamilyCallicebinae Pocock, 1925
- genusPlecturocebus Byrne, Rylands, Carneiro, Lynch Alfaro et al., 2016
- speciesPlecturocebus oenanthe (Thomas, 1924)
Close classified relatives
These entries share the source’s genus, Plecturocebus. They are not necessarily the closest relatives established by molecular evidence.
| Species | Classification | Source status |
|---|---|---|
| Lake Baptista TitiPlecturocebus baptista (Lönnberg, 1939) | PitheciidaeChordata | Accepted speciesRecorded extant |
| Brown TitiPlecturocebus brunneus (Wagner, 1842) | PitheciidaeChordata | Accepted speciesRecorded extant |
| Caquetá TitiPlecturocebus caquetensis (Defler, Bueno & Garcia, 2010) | PitheciidaeChordata | Accepted speciesRecorded extant |
| Ashy TitiPlecturocebus cinerascens (Spix, 1823) | PitheciidaeChordata | Accepted speciesRecorded extant |
| Olalla Brother's TitiPlecturocebus olallae (Lönnberg, 1939) | PitheciidaeChordata | Accepted speciesRecorded extant |
| Stephen Nash's TitiPlecturocebus stephennashi (M. van Roosmalen, T. van Roosmalen & Mittermeier, 2002) | PitheciidaeChordata | Accepted speciesRecorded extant |
| Toppin's TitiPlecturocebus toppini (Thomas, 1914) | PitheciidaeChordata | Accepted speciesRecorded extant |
| Urubamba Brown TitiPlecturocebus urubambensis (Vermeer & Tello-Alvarado, 2015) | PitheciidaeChordata | Accepted speciesRecorded extant |
| Vieira's TitiPlecturocebus vieirai (Gualda-Barros, Nascimento & Amaral, 2012) | PitheciidaeChordata | Accepted speciesRecorded extant |
| Ornate TitiPlecturocebus ornatus (Gray, 1866) | PitheciidaeChordata | Accepted speciesRecorded extant |
| Groves' TitiPlecturocebus grovesi Boubli, Byrne, Silva, Silva-Júnior, Costa Araujo, Bertuol, Gonçalves, Melo, Rylands et al., 2019 | PitheciidaeChordata | Accepted speciesRecorded extant |
| Madidi TitiPlecturocebus aureipalatii (Wallace, Gómez, A. M. Felton & A. Felton, 2006) | PitheciidaeChordata | Accepted speciesRecorded extant |
Names & synonyms
Names explicitly linked to this accepted taxon in the source. Synonymy can change with revision.
| Recorded name | Source status |
|---|---|
| Callicebus oenanthe Thomas, 1924 Thomas, 1924 | synonym |
Documented distribution
Source distribution statements, not a complete range map. A listed locality is not necessarily a place of origin.
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=1025114 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. A suitable sourced image remains to be added.
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:4K5YC. Classification follows source parent identifiers. English common names may vary by region.