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Let us learn about the comparison between platyrrhina and catarrhina.
Comparison # Platyrrhina:
1. Distribution:
New World—tropical and neo-tropical Brazil.
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2. Habit:
Arboreal.
3. Disposition of Hairs:
Usually directed downward.
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4. Nose:
Flat, laterally directed.
5. Cheek pouch:
Absent
6. Nail:
May be claw-like a in Hapalidae
7. Tail:
Long and prehensile.
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8. Forelimbs:
Almost equal to the hind limbs
9. Size and shape of skull:
Usually narrow and small.
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10. Alisphenoid:
Meets the parietal.
11. Jugal:
Comes in contact with the post- parietal.
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12. Tympanic bulla:
Well-developed.
13. Bony auditory meatus:
Ill-developed.
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14. Auditory ring:
Not fused with the skull.
15. Internasal septum:
Broad.
16. Thoracolumbar vertebrae:
Usually 19-20.
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17. Caudal vertebrae:
Never less than 14.
18. Sigmoid notch:
Ill-developed
19. Ischial callosities:
Absent
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20. Definition:
I2/2, C1/1, Pm3/3,m3/3,or 2.1.3.3/2.1.3.2 in Callithricidae (Marmaset).
21. Number of offspring’s:
Usually more than one
Examples:
Cebus (Capuchins), Ateles (spider monkey), Aloyutta (howling monkeys)
Comparison # Catarrhina:
1. Distribution:
Old World—cosmopolitan.
2. Habit:
Arboreal/terrestrial.
3. Disposition of Hairs
Variously disposed.
4. Nose:
Pointed, directed downward
5. Cheek pouch:
Present, except Presbytis and colobus monkeys.
6. Nail:
Flat.
7. Tail:
May be absent. If present, often long but not prehensile.
8. Forelimbs:
May be longer than hind limbs.
9. Size and shape of skull:
Round and large
10. Alisphenoid:
Does not meet the parietal.
11. Jugal:
Does not come in contact with the tubular
12. Tympanic bulla:
ill-developed
13. Bony auditory meatus:
Well-developed and tubular.
14. Auditory ring:
Fused with the skull
15. Internasal septum:
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Narrow
16. Thoracolumbar vertebrae:
Usually 16-18
17. Caudal vertebrae:
Fused with the skull.
18. Sigmoid notch:
Narrow.
19. Ischial callosities:
Well-developed.
20. Dentition:
May be present.
21. Number of offspring’s:
I2/2 ,C1/1Pm2/2m3/3
Examples:
Macaca (Rhesus monkeys), Semnopithicus or Presbytic (langur), Pongo= simian (orangeutan), Hylobates (Gibbon), Homo spines (man).
