. The Ecology of arboreal folivores : a symposium held at the Conservation and Research Center, National Zoological Park, Smithsonian Institution, May 29-31, 1975. Folivores; Forest ecology; Leaves; Mammals; Mammals. i6- 1 • 2 E .'.;' E 18 I 2D- • • #4 O z lO 9 6 L7- 11 • •A m 8 7 S 14 0 U- • X 15 •l3 0 • o • z .8- 16 • 17 • 12 LN BODY MASS (grams) Figure 2. Relative tooth comb length in prosimians. Symbols: 1, Indri indri; 2, Lemur variegatus; 3, Propithecus verreauxi; 4, Lemur mongoz; 5, Lemur macaco; 6, Lemur catta; 7, Hapalemur griseus; 8, Nycticebus coucang; 9, Galago crassicaud
. The Ecology of arboreal folivores : a symposium held at the Conservation and Research Center, National Zoological Park, Smithsonian Institution, May 29-31, 1975. Folivores; Forest ecology; Leaves; Mammals; Mammals. i6- 1 • 2 E .'.;' E 18 I 2D- • • #4 O z lO 9 6 L7- 11 • •A m 8 7 S 14 0 U- • X 15 •l3 0 • o • z .8- 16 • 17 • 12 LN BODY MASS (grams) Figure 2. Relative tooth comb length in prosimians. Symbols: 1, Indri indri; 2, Lemur variegatus; 3, Propithecus verreauxi; 4, Lemur mongoz; 5, Lemur macaco; 6, Lemur catta; 7, Hapalemur griseus; 8, Nycticebus coucang; 9, Galago crassicaudatus; 10, Avahi laniger; 11, Lepilemur mustelinus; 12, Cheirogaleus medius; 13, Galago senegalensis; 14, Galago elegantulus; 15, Lorn tardigradus; 16, Galago demidovii; 17, Microcebus murinus; 18, Phanerfurcifer. they are quite small. Within the highly folivorous in- driids, there is a wide range of size in maxillary in- cisors indicating that there are distinct feeding dif- ferences that relate to food ingestion. Compared to Propithecus sp., the maxillary incisors of both Avahi langur and Indri indri are poorly developed. Whether this morphological difference reflects more bark or fruit eating among populations of Propithecus is un- certain. It is clear, however, that the wear potential of the maxillary incisors is greater in Propithecus. The premolars of prosimians are often used during ingestion. Observations on captive animals at Duke University demonstrates that prosimians commonly slice fruits and leafy materials into bite-sized pieces between the premolars. Among folivorous prosimians, there is a strong tendency to develop the shearing capabilities of the premolar dentition. Presumably this is an adaptation to deal with diets high in fiber content. An analogous situation, to be discussed in more detail below, is encountered in the molar denti- tion of folivorous marsupials. In summary, the anterior dentition of prosimian folivores does not exhibit a
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