TY - JOUR
T1 - Allometry and heterochrony in extant and extinct Malagasy primates
AU - Ravosa, Matthew J.
N1 - Funding Information:
Dr B. Shea, A. Gomez and three anonymous reviewers. provided helpful comments on an earlier version of this paper. For access to primate collections and fossil materials, my sincerest appreciation is extended to the following museum curators and staff? M. Rutzmoser (Harvard Museum of Comparative Zoology); Dr I. Tattersall, Dr E. Delson, W. Fuchs, Dr G. Musser, Dr S. Anderson (American Museum of Natural History); Dr B. Patterson, Dr J. Kerbis (Field Museum of Natural History); Dr R. Thorington, L. Gordon, L. Coley !\Jational Museum of Natural History-Smithsonian); Dr P. Andrews, Dr C. Stringer, P. <Jenkins, R. Kruszynski, M. Sheridan, M. Sheldrick (British Museum ofNatural History); Dr J. Roche, Dr M. Tranier, Dr D. Goujet, F. Petter (Museum National d’Histoire Naturelle); Dr E. Simons, P. Chatrath (Duke University Primate Center); Dr C. Smeenk, Dr M. Hoogmoed, D. Reider (Rijksmuseum van Natuuflijke, Historie); Dr R. Angermann i 14useum fiir Naturkunde-Humboldt Universitlt); Dr: B. Latimer, L. Jellema, L. Linden ! Cleveland Museum of Natural History); F. Sibley, M. Turner (Yale Peabody Museum of Natural History); T. Daeschler (Academy of Natural Sciences of Philadelphia); Dr M. Coombs (Pratt Museum of Natural History); and Dr C. Grigson (Odontological Museum-Royal College of Surgeons). Dr B. Rakotosamimanana of the Service de PalContologie, ITniversit6 de Madagascar, and Dr E. Simons are thanked for permission to examine subfossil !inpalemur simus curated at the Duke University Primate Center. Dr W. Jungers kindly measured specimens ofPachylemur located at the Universitk de Madagascar. B. Fox is thanked fi,r assistance with various phases of this prqject. Dr S. Stack is thanked for continued support and encouragement. I also gladly acknowledge my network of friends that luckily for me reside in cities with museums. Financial support for this research was provided in part by thr NIH (DE-05595), theNSF (BNS-8813220), Northwestern University (0100-510-l lOY), the American Museum of Natural History, the American Philosophical Society, and the Department of Biological Anthropology and Anatomy, Duke University Medical Center. &ubtbssil Hapalemursimus examined in this study were collected with the support ofNSF grant BNS-89 I I3 15 to Drs E. Simons, W. Jungers and L. Godfrey. This is Duke University Primate (:entrr publication no. 5 19.
PY - 1992/8
Y1 - 1992/8
N2 - Measurements of the skull and dentition were obtained for three groups of closely-related Malagasy lemurs: Propithecus verreauxi and P. diadema, Hapalemur griseus and H. simus, and Varecia variegata and subfossil Pachylemur insignis. In Propithecus, ontogenetic series for the larger P. diadema and smaller P. verreauxi were compared to evaluate whether species-level differences in skull form result from the differential extension of common patterns of relative growth. In the other two cases, mostly adult H. simus data and adult Pachylemur data were compared to ontogenetic series for their smaller sister taxa, respectively H. griseus and Varecia, to similarly infer whether morphological differences between these taxa result from the ontogenetic scaling of cranial proportions. First, analyses of the data indicate that cranial proportions for both species of Propithecus are ontogenetically scaled. As such, P. diadema apparently attains larger overall size primarily by growing at a faster rate, but not for a longer duration, than P. verreauxi. Second, analyses of the Hapalemur data suggest that facial proportions, but not mandibular dimensions, in both species are ontogenetically scaled. It is inferred that differences in patterns of relative growth for the mandibular corpus and symphysis of bamboo lemurs are correlated with differences in the loading regime of the lower jaw due to variation in the mechanical properties of their diets. Finally, analyses of the data indicate that most cranial proportions for Varecia and Pachylemur are not ontogenetically scaled, thus supporting claims for the generic separation of these taxa. Additional consideration of these comparisons and examples from the literature illustrate potential differences in the effects of selection for body size increases versus decreases, and selection for greater inter- versus intra-specific body size variation, on postcanine dental allometry in ontogenetically-scaled taxa. Possible differences in the development process underlying phyletic size change are also discussed.
AB - Measurements of the skull and dentition were obtained for three groups of closely-related Malagasy lemurs: Propithecus verreauxi and P. diadema, Hapalemur griseus and H. simus, and Varecia variegata and subfossil Pachylemur insignis. In Propithecus, ontogenetic series for the larger P. diadema and smaller P. verreauxi were compared to evaluate whether species-level differences in skull form result from the differential extension of common patterns of relative growth. In the other two cases, mostly adult H. simus data and adult Pachylemur data were compared to ontogenetic series for their smaller sister taxa, respectively H. griseus and Varecia, to similarly infer whether morphological differences between these taxa result from the ontogenetic scaling of cranial proportions. First, analyses of the data indicate that cranial proportions for both species of Propithecus are ontogenetically scaled. As such, P. diadema apparently attains larger overall size primarily by growing at a faster rate, but not for a longer duration, than P. verreauxi. Second, analyses of the Hapalemur data suggest that facial proportions, but not mandibular dimensions, in both species are ontogenetically scaled. It is inferred that differences in patterns of relative growth for the mandibular corpus and symphysis of bamboo lemurs are correlated with differences in the loading regime of the lower jaw due to variation in the mechanical properties of their diets. Finally, analyses of the data indicate that most cranial proportions for Varecia and Pachylemur are not ontogenetically scaled, thus supporting claims for the generic separation of these taxa. Additional consideration of these comparisons and examples from the literature illustrate potential differences in the effects of selection for body size increases versus decreases, and selection for greater inter- versus intra-specific body size variation, on postcanine dental allometry in ontogenetically-scaled taxa. Possible differences in the development process underlying phyletic size change are also discussed.
KW - Madagascar
KW - allometry
KW - heterochrony
KW - lemurs
KW - ontogeny
KW - skull form
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U2 - 10.1016/0047-2484(92)90107-K
DO - 10.1016/0047-2484(92)90107-K
M3 - Article
AN - SCOPUS:0000473448
SN - 0047-2484
VL - 23
SP - 197
EP - 217
JO - Journal of Human Evolution
JF - Journal of Human Evolution
IS - 2
ER -