kimerajamm
Joined: 28 Nov 2010
Posts: 785
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 Posted: Mon Apr 25, 2011 11:19 am Post subject: Even tooth development |
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All of the extinct subfossil lemurs, including the smallest species (Pachylemur, Mesopropithecus, and the giant aye-aye), were larger than the lemur species alive today. The largest species were among the largest primates ever to have evolved. Due to their larger size, the extinct subfossil lemurs have been compared to large-bodied anthropoids (monkeys and apes), yet they more closely resemble the small-bodied lemurs.[8] Like other lemurs, the subfossil lemurs did not exhibit appreciable differences in body or canine tooth size between males and females (sexual dimorphism).[8] This suggests that they, too, either exhibited female social dominance or lacked male dominance, possibly exhibiting the same levels of agonism (aggressive competition) seen in extant lemurs.[9] Like other lemurs, they had smaller brains than comparably sized anthropoids. Most species also had a unique strepsirrhine dental trait, called a toothcomb, which is used for grooming. Even tooth development and weaning was rapid compared to similarly sized anthropoids,[8][9] suggesting faster sexual maturity of their offspring.[8] Most subfossil lemurs also had high retinal summation (sensitivity to low light), resulting in poor day vision (low visual acuity) compared to anthropoids.[8][9] This has been demonstrated by the ratio between their relatively small orbits (eye sockets) and the relative size of their optic canal, which is comparable to that of other lemurs, not diurnal anthropoids.[9
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