Odd-nosed monkey scapular morphology converges on that of arm-swinging apes

Selby, Michael S; Lovejoy, C. Owen; Byron, Craig

doi:10.1016/j.jhevol.2020.102784

Cited by 4 publications

(5 citation statements)

References 75 publications

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“…In most studies the skeletonized glenoid cavities of hominoids tend to display an intermediate morphology between oval and round, with hylobatids having the roundest glenoids. Cercopithecoids, on the other hand, are found here to display a great amount of variation, not showing the marked pear-shaped morphology reported in previous works (e.g., Arias-Martorell et al, 2015;Selby et al, 2020). This is the case of the two Papio and the Cercocebus individuals, which do not present a pear-shaped glenoid.…”

Section: Geometric Morphometricscontrasting

confidence: 69%

The morphofunctional implications of the glenoid labrum of the glenohumeral joint in hominoids

Raventós-Izard

Potau

Casado

et al. 2023

American Journal of Biological Anthropology

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Objectives A morphocline of the glenoid cavity has been used to infer differences in locomotor behaviors; however, the glenoid cavity is surrounded by the glenoid labrum, a fibrocartilaginous structure that could influence the functionality of the glenoid. The objectives of this study are to explore the effects of the glenoid labrum on the area, depth, and morphology of the glenoid cavity in primates. Materials and Methods Photogrammetry was used to build 3D models of the glenoid, with and without the labrum, and three‐ (3D) and two‐dimensional (2D) geometric morphometrics (GM) was applied. 2D areas were collected from zenithal images for glenoids with and without labrum to evaluate the availability of articular surface area. Results In the 2D GM the morphocline is present in the dry‐bone sample but not with the presence of the glenoid labrum. In the 3D GM there are differences between species mainly concerning the depth of the glenoid cavity. 2D areas reveal that the amount of articular area of the glenoid cavity increases with the presence of the labrum, particularly in humans. Discussion The glenoid labrum changes the shape, increases the depth and the surface area of the glenoid cavity, particularly in humans. Therefore, the glenoid labrum might hold a functional role, increasing the stability of the glenohumeral joint of primates in general, and especially in humans.

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Section: Geometric Morphometricscontrasting

confidence: 69%

The morphofunctional implications of the glenoid labrum of the glenohumeral joint in hominoids

Raventós-Izard

Potau

Casado

et al. 2023

American Journal of Biological Anthropology

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“…This contrasts with relatively strong negative allometry in the hind limb (Supplementary Fig. 3 ; Supplementary Data 15 , 17 – 29 ), highlighting the different mechanical roles of the limbs in forelimb-driven locomotion through trees 46 .…”

Section: Resultsmentioning

confidence: 98%

“…Forelimb elongation may be mechanically beneficial to flying taxa by facilitating increases to wing area and muscle mass to produce both lift and thrust for take-off and sustained flight 43 , 44 , and to assist climbing in arboreal taxa 45 , 46 . Active fliers and soarers have significantly larger humeral, forearm and metacarpal segments and overall forelimb lengths than almost all other locomotor categories (Fig.…”

Section: Resultsmentioning

confidence: 99%

Body size, shape and ecology in tetrapods

et al. 2022

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Body size and shape play fundamental roles in organismal function and it is expected that animals may possess body proportions that are well-suited to their ecological niche. Tetrapods exhibit a diverse array of body shapes, but to date this diversity in body proportions and its relationship to ecology have not been systematically quantified. Using whole-body skeletal models of 410 extinct and extant tetrapods, we show that allometric relationships vary across individual body segments thereby yielding changes in overall body shape as size increases. However, we also find statistical support for quadratic relationships indicative of differential scaling in small-medium versus large animals. Comparisons of locomotor and dietary groups highlight key differences in body proportions that may mechanistically underlie occupation of major ecological niches. Our results emphasise the pivotal role of body proportions in the broad-scale ecological diversity of tetrapods.

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“…Clamber, along with arm-swing and bridge, enables monkeys to move effectively across multiple substrates of different sizes and inclinations whereas dealing with the irregular, discontinuous, and unstable nature of tree crowns peripheries (Grand 1972 , 1984 ; Cant 1992 ; Granatosky and Schmitt 2019 ). Habitual clamber and suspensory behavior require increased forelimb mobility, for a greater and more efficient reach ( Selby et al 2020 ). Preliminary personal observations on the post-cranium of R. strykeri show forelimb features similar to those of other clambering and suspensory primates, such as a craniocaudally wide scapula, relatively long forelimbs, a rounded humeral head, a well-developed rounded capitulum, a short olecranon, and a relatively long and curved radius ( Su and Jablonksi 2009 ; Byron et al 2017 ; Selby et al 2020 ).…”

Section: Discussionmentioning

confidence: 99%

“…Habitual clamber and suspensory behavior require increased forelimb mobility, for a greater and more efficient reach ( Selby et al 2020 ). Preliminary personal observations on the post-cranium of R. strykeri show forelimb features similar to those of other clambering and suspensory primates, such as a craniocaudally wide scapula, relatively long forelimbs, a rounded humeral head, a well-developed rounded capitulum, a short olecranon, and a relatively long and curved radius ( Su and Jablonksi 2009 ; Byron et al 2017 ; Selby et al 2020 ).…”

Section: Discussionmentioning

confidence: 99%

Positional behavior and canopy use of black snub-nosed monkeys Rhinopithecus strykeri in the Gaoligong Mountains, Yunnan, China

et al. 2021

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Studies on positional behavior and canopy use are essential for understanding how arboreal animals adapt their morphological characteristics and behaviors to the challenges of their environment. The present study explores canopy and substrate use along with positional behavior in adult black snub-nosed monkeys (Rhinopithecus strykeri), an endemic, Critically Endangered primate species in Gaoligong Mountains, southwest China. Using continuous focal animal sampling, we collected data over a 52-month period and found that R. strykeri is highly arboreal primarily using the high layers of the forest canopy (15-30 m), along with the terminal zone of tree crowns (52.9%), medium substrates (41.5%), and oblique substrates (56.8%). We also found sex differences in canopy and substrate use. Females use the terminal zones (56.7% vs. 40.4%), small/medium (77.7.% vs. 60.1%) and oblique (59.9% vs. 46.5%) substrates significantly more than males. On the other hand, males spend more time on large/very large (39.9% vs. 22.3%) and horizontal (49.7% vs. 35.2%) substrates. While both sexes mainly sit (84.7%), and stand quadrupedally (9.1%), males stand quadrupedally (11.5% vs. 8.3%) and bipedally (2.9% vs. 0.8%) more often than females. Clamber, quadrupedalism and leap/drop are the main locomotor modes for both sexes. Rhinopithecus strykeri populations never enter canopies of degenerated secondary forest and mainly use terminal branches in the middle and upper layers of canopies in intact mid-montane moist evergreen broadleaf forest and hemlock coniferous broadleaf mixed forests across their habitat.

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Odd-nosed monkey scapular morphology converges on that of arm-swinging apes

Cited by 4 publications

References 75 publications

The morphofunctional implications of the glenoid labrum of the glenohumeral joint in hominoids

The morphofunctional implications of the glenoid labrum of the glenohumeral joint in hominoids

Body size, shape and ecology in tetrapods

Positional behavior and canopy use of black snub-nosed monkeys Rhinopithecus strykeri in the Gaoligong Mountains, Yunnan, China

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