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Lagonimico

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Lagonimico
Temporal range:Middle Miocene(Laventan)
~13.8–11.8Ma
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Scientific classificationEdit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Primates
Suborder: Haplorhini
Infraorder: Simiiformes
Family: Pitheciidae
Genus: †Lagonimico
Kay, 1994
Species:
†L. conclucatus
Binomial name
†Lagonimico conclucatus
Kay, 1994

Lagonimicois anextinctgenusofNew World monkeysfrom theMiddle Miocene(Laventanin theSouth American land mammal ages;13.8 to 11.8 Ma). Its remains have been found at theKonzentrat-LagerstätteofLa Ventain theHonda GroupofColombia.Thetype speciesisLagonimico conclucatus.[1]

Description

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A nearly complete but badly crushed skull and mandible ofLagonimicowere discovered in theLa Victoria Formation,that has been dated to theLaventan,about 13.5 to 12.9 Ma.[2][3]Lagonimico,asMicodonandPatasola magdalenae,also from the Honda Group, have been attributed to theCallitrichinae.[4]

Features of the dentition suggestLagonimicois a sister group to livingCallitrichinae(Saguinus,Leontopithecus,Callithrix,andCebuella). These features include having elongate compressed lower incisors, a reduced P2 lingual moiety, and the absence of upper molarhypocones.The new taxon also has a relatively deep jaw, that rule it out of the direct ancestry of any living callitrichine.[3]

The orbits ofL. conclucatusare small, suggesting diurnal habits. Inflated, low-crowned (bunodont) cheek teeth with short, rounded shearing crests, as well as premolar simplification and M3 size reduction, suggest fruit- or gum eating adaptations, as among many living callitrichines. Procumbent and slightly elongate lower incisors suggest this species could use its front teeth as a gouge, perhaps for harvesting tree gum. Estimates from jaw size suggestLagonimicoweighed about 1,200 to 1,300 grams (2.6 to 2.9 lb),[3][5]about the size ofCallicebus,the living titi monkey of South America.[6]Later research reduced the estimated weight to 595 grams (1.312 lb).[7]Judged from tooth size and jaw length,Lagonimicowould have been slightly smaller thanCallicebus,but still larger thanCallimicoor any living callitrichine.[3]

The upper first molar (M1) with a subtriangular outline with a narrow lingual side resembles that of the oldest New World primate discovered to date, theLate EocenePerupithecusfrom the Peruvian Amazon.[8]

Habitat

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See also:Honda Group, Colombia § Paleoclimate and vegetation

The Honda Group, and more precisely the "Monkey Beds", are the richest site forfossil primates in South America.[9]Other than most fossil primates found at La Venta, the specimens ofLagonimicodo not come from the "Monkey Beds".[10]It has been argued that the monkeys of the Honda Group were living in habitat that was in contact with theAmazonandOrinoco Basins,and that La Venta itself was probably seasonally dry forest.[11]The evolutionary separation fromAotusofLagonimicohas been placed in the Early Miocene at 17.5 Ma.[12]

See also

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References

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  1. ^Lagonimico conclucatusatFossilworks.org
  2. ^Defler, 2004, p.32
  3. ^abcdKay, 1994, p.333
  4. ^Takai et al., 2001, p.290
  5. ^Pérez et al., 2013, p.9
  6. ^Tejedor, 2013, p.29
  7. ^Silvestro et al., 2017, p.14
  8. ^Bond et al., 2015, p.538
  9. ^Rosenberger & Hartwig, 2001, p.3
  10. ^Wheeler, 2010, p.137
  11. ^Lynch Alfaro et al., 2015, p.520
  12. ^Takai et al., 2001, p.304

Bibliography

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Further reading

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