Dental and cranial variation in living Indriidae

Gingerich, Philip D.; Ryan, Allan J.

doi:10.1007/bf02373833

Cited by 51 publications

(29 citation statements)

References 19 publications

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“…Sakai (1981), analyzing regional differences in Urotrichus, concluded that the least size variability was found in M2, which agrees with the results of the present study. Similar findings in Tupaia have been reported by Kondo et al (1994), and in Indriidae (Primates) by Gingerich and Ryan (1979). An association between early formation and low morphological variability in M1 was noted by Gingerich (1974).…”

Section: Discussionsupporting

confidence: 83%

Crown Structure of the Maxillary Molars in the Japanese Shrew Mole, Urotrichus talpoides (Insectivora, Talpidae)

Kondo

Hanamura

Natori

et al. 1998

Okajimas Folia Anatomica Japonica

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Summary: The maxillary first and second molars (M1 and M2) in the Japanese shrew mole, Urotrichus talpoides, were investigated using an odontometrical approach. The mesiodistal crown diameter was larger in M1 than in M2, while the buccolingual diameter of M1 was nearly equal to that of M2. M2 was more compressed mesiodistally than M1. M1 had a large distal triangle on the stylar shelf. The mesial triangle of M2 was slightly larger than the distal triangle. Despite being smaller than M1, M2 was less variable than M1 in terms of size. The distal triangle of M1 and the mesial triangle of M2 were well developed, and thus this area, which corresponds to the inflection point of the maxillary dental arch, was most likely the center of an occlusal function.

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Section: Discussionsupporting

confidence: 83%

Crown Structure of the Maxillary Molars in the Japanese Shrew Mole, Urotrichus talpoides (Insectivora, Talpidae)

Kondo

Hanamura

Natori

et al. 1998

Okajimas Folia Anatomica Japonica

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“…The landmarks were subsequently digitized into a coordinate system using the tpsDIG (v 2.0) (Rohlf, 2004) software package. The lower first molar was chosen because it is the least variable along the molar tooth row in most primate and non-primate taxa and likely represents the single best tooth to study size distribution and variability in the fossil record (Gingerich, 1974(Gingerich, , 1979. The relative location of molar cusps (protoconid, metaconid, hypoconid, and entoconid), along with the intersection of the anterior extension of the cristid obliqua with the protolophid base, were chosen as landmarks to capture either the gross dimensions of major crushing areas (the talonid basin of the lower molar) or the relative position of shearing structures (Fig.…”

Section: Geometric Morphometric Investigation Of Shapementioning

confidence: 99%

Geometric Morphometric Investigation of Molar Shape Diversity in Modern Lemurs and Lorises

White

2009

The Anatomical Record

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In the study of mammalian adaptation to the environment, teeth are of primary importance due to their role as one of the direct interaction points between an individual and its ecological surroundings. Here, molar shape and function are investigated through traditional multivariate statistics and Thin-Plate Splines deformations to compare the relative location of lower first molar occlusal structures (protoconid, metaconid, hypoconid, entoconid, cristid obliqua, and protolophid) in modern lemurs, lorises, tarsiers, and a non-primate outgroup taxon (Tupaia). Results suggest that shape is based both on tooth size and dietary patterns. Small teeth tend to be short (anteroposteriorally) with wide talonids, whereas larger teeth are generally characterized as being long and narrow. In considering non-size related shape trends, frugivorous and graminivorous taxa generally exhibit a relatively buccal intersection of the cristid obliqua with the base of the protolophid, and a relatively ''perpendicular'' position of the protolophid in relation to the anteroposterior axis of the tooth (defined as the axis connecting the protolophid and hypoconid). Morphological trends of folivores include a central (midline) position of the cristid obliqua-protolophid base intersection and an oblique angle of the protolophid. Insectivorous taxa (primate and non-primate) generally exhibit a central placement of the cristid obliqua-protolophid base intersection (as in folivores), along with a relatively perpendicular angle of the protolophid (as in frugivores). Omnivorous taxa exhibit shape patterns that are intermediate between these three former groups. This study provides a comparative baseline for the interpretation of morphological trends in fossil primate groups, particularly the Adapiformes. Anat Rec, 292:701-719, 2009. V V C 2009 Wiley-Liss, Inc.

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“…Jolly 8 It is tempting to relate the lack of sexual dimorphism in lemurs, including the large extinct lemurs, to a legacy of monogamy. The problem is that polygamous lemurs also have no or reduced dimorphism, including those with visible, physical fighting between males over estrous females, such as the solitary aye-aye and the troop-living L. catta [57,104,105].…”

Section: Pair-bonding and Female Dominancementioning

confidence: 99%

Pair-Bonding, Female Aggression and the Evolution of Lemur Societies

Jolly¹

1998

IJFP

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Lemur societies have been described as convergent with those of anthropoids, including Papio-like female-bonded multi-male groups. Recent research, however, shows at least 5 pair-bonded species among the Lemuridae and Indriidae. Three more, Eulemur mongoz, Eulemur fulvus and Varecia variegata, have societies combining aspects of pairing with aspects of troop life. The best-known female-bonded societies, those of Lemur catta, Propithecus diadema edwardsi and Propithecus verreauxi, may be assemblages of mother-daughter dyads, capable of high aggression towards other females, but derived from more solitary female ancestors, perhaps also living as pairs. The internal structure of such lemur groups differs from the more extensive kin groups of catarrhines. This in turn may relate to the lemurs’ level of social intelligence and to lemur female dominance over males.

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Dental and cranial variation in living Indriidae

Cited by 51 publications

References 19 publications

Crown Structure of the Maxillary Molars in the Japanese Shrew Mole, Urotrichus talpoides (Insectivora, Talpidae)

Crown Structure of the Maxillary Molars in the Japanese Shrew Mole, Urotrichus talpoides (Insectivora, Talpidae)

Geometric Morphometric Investigation of Molar Shape Diversity in Modern Lemurs and Lorises

Pair-Bonding, Female Aggression and the Evolution of Lemur Societies

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