In platyrrhines, this nose is relatively broad and the nostrils are wide and directed laterally (outward), whereas catarrhines possess quite narrow nostrils that tend to face ventrally (downward), a significant external character that is responsible for their name.
What are some characteristics of catarrhines?
They are characterized by having a narrow nose. Their nostrils are close together as opposed to platyrrhines that have a flat-bridged nose. Other distinctive features include having flat fingernails and toenails, eight instead of 12 premolars, and lacking prehensile tails.
How do you tell a platyrrhine from a catarrhine?
Noses and Nostrils Furthermore, platyrrhines have flatter noses with nostrils facing sideways separated by a wide septum while catarrhines have hooked noses with nostrils facing downwards separated by a small septum.
What is a catarrhine nose?
The platyrrhines (from Ancient Greek platu-, "flat", and rhin-, "nose") have nostrils which face sideways. The catarrhines (from Ancient Greek kata-, "down", and rhin-, "nose") have nostrils that face downwards.
What type of noses do platyrrhines have?
In New World monkeys (the Platyrrhini, meaning “flat nosed”), the nose is broad, and the nostrils are set wide apart, well separated by a broad septum, and point sideways.
Do catarrhines have color vision?
Although all catarrhines studied to date are trichromatic, most platyrrhines have polymorphic color vision;19,35 exceptions include the howler (Alouatta spp—uniformly trichromatic; see ref. 36), the night monkey (Aotus spp—uniformly monochromatic; see refs. 36–37), and some strepsirhines.
Where did catarrhines come from?
Abstract. The catarrhines are a group of anthropoid primates comprising the Old World monkeys, apes, and humans. The earliest record of fossil catarrhines, the propliopithecoids, comes from the Early Oligocene of Egypt (29–32 million years ago (mya)).
When did catarrhines emerge?
Early catarrhines This fossil genus is African, and is found from about 33 to 34 million years ago.
What are the geographic differences between platyrrhines and catarrhines?
The most obvious difference is the shape of the nose: platyrrhine means flat-nosed, whilecatarrhine means hook-nosed. In platyrrhines, the nostrils are farther apart and they point outward, while in the catarrhines, they're closer together and they point down.
What evolved into catarrhines?
The earliest known catarrhine is Kamoyapithecus from uppermost Oligocene at Eragaleit in the northern Kenya Rift Valley, dated to 24 million years ago. Its ancestry is thought to be species related to Aegyptopithecus, Propliopithecus, and Parapithecus from the Faiyum depression, at around 35 million years ago.
Why do monkeys have round nostrils?
1:013:15Why Do These Monkeys Have Such Outrageous Noses? - YouTubeYouTubeStart of suggested clipEnd of suggested clipLeaves. So they can easily chomp away on food that other monkeys just can't stomach proboscisMoreLeaves. So they can easily chomp away on food that other monkeys just can't stomach proboscis monkeys live in troops.
Which of the following features characterizes platyrrhines?
Which of the following features characterizes platyrrhines? They have three premolar teeth.
Why do Strepsirrhines have a more sensitive nasal structure than Haplorhines?
Strepsirhines have moist noses; haplorhines have simple, dry noses. Strepsirhines have longer snouts, smaller brains and a more highly developed sense of smell than haplorhines.