platyrrhine การใช้

• Its common ancestor with the platyrrhine monkeys would also be considered a monkey.
• Post-cranially, pliopithecoids had an interesting mix of platyrrhine and catarrhine traits.
• Note that the RBP3 intron 1 has also been used to investigate the platyrrhine primates phylogenetics.
• :: Yes, the platyrrhine monkeys originated in South America 40 million y / a.
• The technical distinction between the New World platyrrhines and Old World catarrhines is the shape of their noses.
• In contrast, platyrrhines have only a single, polymorphic X chromosome M / L opsin gene locus.
• This taxon was traditionally thought to be a primitive lineage, from which all the larger-bodied platyrrhines evolved.
• The premaxilla is short, giving the appearance of a small, not especially prognathic face relative to other platyrrhines.
• This hypothesis proposes that this crossing-over event occurred in a heterozygous catarrhine female sometime after the platyrrhine / catarrhine divergence.
• Like catarrhines, howler monkeys ( a family of platyrrhines ) show routine trichromatism that has been traced to an evolutionarily recent gene duplication.
• However, all living primates have lost at least the first premolar . " Hence most of the prosimians and platyrrhines have three premolars.
• This has led many scientists to hypothesize that the primitive platyrrhine ancestors of " Branisella " came to South America from Africa.
• Like the platyrrhines, the catarrhines are generally diurnal, and have grasping hands and ( with the exception of bipedal humans ) grasping feet.
• Within platyrrhines, this taxon has been interpreted as either a stem platyrrhine not related to any of the living forms, or as a primitive callitrichine.
• Within platyrrhines, this taxon has been interpreted as either a stem platyrrhine not related to any of the living forms, or as a primitive callitrichine.
• This species had an auditory region which is similar to that found in platyrrhines, having no bony tube and the tympanic fused to the lateral surface of the bulla.
• This anatomical feature represents an intermediate stage between what is found in platyrrhines, which do not have an ossified ectotympanic tube, and catarrhines, which have a completely ossified ectoympanic tube.
• The same speceimen preserved a cross section of the ectotypanic ring, showing it to be an annular structure which was fused to the margin of the bulla similar in structure to modern platyrrhines.
• Platyrrhines also differ from Old World monkeys in that they have twelve premolars instead of eight; having a dental formula of or ( consisting of 2 incisors, 1 canine, 3 premolars, and 2 or 3 molars ).
• Molecular studies of concatenated nuclear sequences have yielded a widely varying estimated date of divergence between platyrrhines and catarrhines, ranging from 33 to 70 mya, while studies based on mitochondrial sequences produce a narrower range of 35 to 43 mya.