摘要：Microscopic identification of the hairs of Brazilian Alouatta Lacépède, 1799 species (Primates,
Atelidae, Alouattinae).
The hair structure of five species of Brazilian howler monkeys is described. The hairs were cleared to reveal
the medulla cells and impressions were made of the cuticle. A new cuticle scale pattern and four new
medulla cell patterns are described. The cuticle scales in Alouatta guariba form a transverse wave pattern;
their margins are ornamented and predominantly continuous, although some may be discontinuous. Alouatta
caraya scales vary between two transverse wave patterns, one with alternately continuous and discontinuous
margins and the other with predominantly continuous margins. Alouatta belzebul hairs have irregular wavy
scales with discontinuous margins; in the apical third they adopt a transverse wave form with alternately
continuous and discontinuous margins. Alouatta seniculus has scales in a transverse wave pattern with
discontinuous margins, whereas A. nigerrima has narrow scales in a transverse wave pattern with
discontinuous margins. The medulla cells form an isolated uniserial ladder in A. guariba, a uniserial juxtaposed
stoma pattern in A. caraya, and a uniserial juxtaposed rectangular pattern in A. belzebul. In A. seniculus
they are granulated, and in A. nigerrima they occur in a uniserial juxtaposed fusiform pattern, which is
entire and homogeneous. Significant differences were seen among the species and a key was produced on
the basis of these trichological characteristics. Hairs from young individuals were also analyzed but did not
show the patterns found in adults; therefore, juveniles cannot be identified by this technique.
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