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Suborder Haplorhini


The suborder Haplorhini was named in...

Distinguishing Characteristics

Plesiomorphies

Dichromatic (two-color) vision, inherited from basal primata, preserved in most members of the platyrhini as well as in all tarsiiformes. Modified to trichromatic (three-color) vision in catarhini and in howler monkeys. This is likely symplesiomorphic with the dichromatic vision in Strepsirrhini (i.e., a trait that both groups share due to common ancestry).

Apomorphies

As mentioned above, the ancestral dichromacy shared with the strepsirhini was modified in two separate lineages of haplorhini: Howler monkeys (platyrhini) and in catarhini. (Kawamura &al., 2012)

Neoteny

In addition, haplorhines are neotenous compared to other primates. This means that we retain a more juvenile appearance.

Neoteny
Figure 1 — Pug (top left), chihuahua (mid left), grey wolf (bottom left), marmoset (top right), tarsier (mid right), and ring-tailed lemur (bottom right). Just as chihuahuas and pugs are neotenous wolves, so too are haplorrhines neotenous primates. And between the two groups of haplorrhines, the simiiformes appear to be even more neotenous than the tarsiiformes.

Extant Haplorhines

Tarsier
Tarsiiformes
Capuchin
Simiiformes

References


Kawamura S., Hiramatsu C., Melin A.D., Schaffner C.M., Aureli F., Fedigan L.M. (2012) Polymorphic Color Vision in Primates: Evolutionary Considerations. In: Hirai H., Imai H., Go Y. (eds) Post-Genome Biology of Primates. Primatology Monographs. Springer, Tokyo
https://doi.org/10.1007/978-4-431-54011-3_7



Immediate Phylogeny

Parent Group
Primata

Sister Groups
Stepsirrhini (Prosimians)

Daughter Groups
Simiiformes
Tarsiiformes

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Taxonomy

DomainEucarya

KingdomMetazoa

Phylum Chordata

Subphylum Vertebrata

Superclass Tetrapoda

Class Mammalia

Subclass Eutheria

Infraclass Placentalia

Magnorder Boreoeutheria

Superorder Euarchontoglires

Mirorder Primatomorpha

Order
Primata

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