Boyer diss 2009 1046..

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its body size would fit predictions based on the observation that euprimate folivores have larger teeth than more dietarily-generalized relatives of the same body size (Kay, 1975). The postcranial skeleton of Plesiadapis cookei and evidence for a suspensory, arboreal locomotor repertoire Chapter 4 represents the most comprehensive description and documentation of plesiadapid postcranial morphology yet. Beard’s (1989) work is more thorough in that it has a larger and (in some ways) better distributed extant comparative sample. However, more fossil material is considered in this chapter than in Beard’s study and raw measurements comprehensively representing the postcranium are presented for virtually all available plesiadapid specimens known. Furthermore, HRxCT imagery allows a more complete view of carpal, metacarpal, tarsal, and metatarsal complexes because it provides the capacity to invert left side bones into right side bones, and to scale elements from any given species for articulation with bones of P. cookei. Medical and HRxCT scan images are also used to thoroughly illustrate complex morphology and articulations of the elbow, wrist, hip, knee, and ankle joints, as well as the carpus, metacarpus, tarsus and metatarsus. Finally, quantitative comparisons among bones attributed to different plesiadapid species allow some of the first concrete statements regarding interspecific differences in the morphology of the plesiadapid postcranium. Major points demonstrated in this chapter include the following: (1) the plesiadapid clavicle is distinctively superoinferiorly expanded; (2) most plesiadapid humeri have a lateral keel on the ulnar trochlea; (3) humeri of large-bodied plesiadapids exhibit lateral torsion of the distal end; (4) the humerus of Plesiadapis cookei is 550
absolutely longer and absolutely smaller in cross-sectional dimensions, and thus more slender than that of P. tricuspidens; (5) the wrist of P. cookei exhibits a relatively large lunate that intervenes between the triquetrum and scaphoid, and contacts the radius and ulna; (6) the bone previously identified as a lunate in Nannodectes intermedius is actually a sesamoid of the metacarpophalangeal joint; (7) the pollical metacarpal did not contact the second metacarpal at its proximal end and was mobile with respect to it; (8) the metacarpus is shorter than previously thought, meaning the fingers were proportionally longer than previously determined; (9) the intermediate phalanges of large-bodied plesiadapids are more robust than those of smaller plesiadapids; (10) the intermediate phalanges of P. cookei and P. n. sp. are proportionally mediolaterally narrower than those of other plesiadapids; (11) the innominate of P. cookei has a caudally positioned, craniocaudally narrow pubic symphysis; (12) the femur of P. cookei has a shaft distal to the lesser trochanter that is absolutely longer than that of P. tricuspidens, but which is otherwise metrically identical; (13) the astragalotibial joint had a limited capacity for plantarflexion but enhanced capacities for conjunct medial rotation and inversion; (14) the calcaneocuboid joint has its greatest mobility in abduction and adduction, not rotation; (15) the axis of the vertebral column of all known plesiadapids probably had a cranially projecting spinous process; (16) the neck of plesiadapids appears to have been relatively short compared to the trunk; (17) there appear to have been at least 13 thoracic, 7 lumbar, 3 sacral, and 20 caudal vertebrae in P. cookei; (18) the anticlinal spinous process appears to have been situated on T12 while the diaphragmatic vertebra appears to have been T11 in P. cookei; (19) the sacrum of plesiadapids has a large, craniallyprojecting first spinous process, a rudimentary second spinous process, and a large, 551
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NEW CRANIAL AND POSTCRANIAL REMAINS
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Stony Brook University The Graduate
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postcranial anatomy more accurately
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Table of Contents List of Figures .
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Zygomatic. . . . . . . . . . . . .
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Zygomatic. . . . . . . . . . . . .
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Humerus . . . . . . . . . . . . . .
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Description . . . . . . . . . . . .
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Description . . . . . . . . . . . .
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Craniodental material of Plesiadapi
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Figure 2.25. MNHN CR 965 Plesiadapi
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Figure 4.24. UM 87990 Plesiadapis c
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Table List Chapter 2 Table 2.1. Num
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Table 4.30. Caudal vertebrae measur
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CHAPTER 1: INTRODUCTION Plesiadapif
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primates, sharing many dental featu
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were acquired. Specifically, the
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of the plesiadapiform skeleton. Ext
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Gervais, M.P., 1877. Enumération d
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Szalay, F.S., 1972. Cranial morphol
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CHAPTER 2: A REEVALUATION OF CRANIA
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Information on the cranium of basal
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petrosal bulla predicts that a sutu
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History of descriptive study of ple
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Gingerich (1971) rebutted Szalay (1
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9c, Gingerich (1976) labeled a groo
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portion of the bulla medial to the
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Bloch and Silcox (2006) described t
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MATERIALS AND METHODS Material exam
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whitening, dark and light areas on
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SYSTEMATIC PALEONTOLOGY Class MAMMA
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efore meeting a large, anteroposter
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The canine is a simple, single-root
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existence and/or nature of contacts
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outlined. This includes description
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eneath it while also extending post
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y a pair of parallel grooves (Fig.
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the skull (Fig. 2.1). The length of
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margin clearly had a posteriorly pr
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groove measures about 0.29 mm in di
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2.13: 50). The suture with the supr
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preserved (Fig. 2.15: 55). In fact,
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the posterior septum, a deeply inci
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Plesiadapis tricuspidens MNHN CR 12
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is roughly 2.8 mm long. Medial to t
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is not convoluted like many other s
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110) and the only squamosal/alisphe
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two regions for the internal jugula
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ventral to the sinuous suture (132)
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provides measurements of these and
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of the promontorium of the Pellouin
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seen on the HRxCT scan is expressed
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primates, as well as treeshrews and
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canaliculus are present on the sept
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it is missing from the other side o
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observations and interpretations ma
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REFERENCES Beard, K.C., 1993. Phylo
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Russell, D.E., 1959. Le crâne de P
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TABLES Table 2.1. Numerical list of
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81 - Occipital/petrosal suture (Fig
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Table 2.2. Abbreviations for crania
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Table 2.3a. Petrosal features of pl
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Table 2.4. List of cranial measurem
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Shape variables (Table 2.6) ac/GM -
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Table 2.5. continued Specimen MNHN
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Appendix Table 2.1. Specimens scann
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Fig. 2.39 - bs, Ptr, rtp, s1, s2 Fi
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Figure 2.1. UALVP 46685 Pronothodec
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Figure 2.8. USNM 309902 Nannodectes
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Figure 2.9. USNM 309902 Nannodectes
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Figure 2.10. USNM 309902 Nannodecte
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Figure 2.15. AMNH 17388 Nannodectes
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Figure 2.16. AMNH 17388 Nannodectes
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Figure 2.22. MNHN CR 965, Plesiadap
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Figure 2.26. Pellouin skull Plesiad
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Figure 2.30. MaPhQ 33y Adapis paris
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Figure 2.32. SBU MRd-12 Sciurus car
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Figure 2.33. UMMZ 58983 Tupaia glis
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Figure 2.34. Boyer coll. Marmota mo
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Figure 2.35. UMMZ TS13 Lagostomus m
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Figure 2.36. AMNH 41527 Lagostomus
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Figure 2.37. AMNH 185638 Indri indr
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Figure 2.38. USNM 482353 Ignacius c
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Figure 2.39. UM 108207 Acidomomys h
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Figure 2.40. Reconstruction of ples
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CHAPTER 3: DESCRIPTION OF THE FIRST
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these species. Changing ecological
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Institutional abbreviations AMNH, A
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Methods of examination and document
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SYSTEMATIC PALEONTOLOGY Class MAMMA
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Premaxilla and premaxillary dentiti
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nerve and vessels in life (Fig. 3.5
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identifiable. No ethmoid foramina c
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process is quite large, projecting
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vestibuli. This groove’s point of
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9: 40). The right side reveals an a
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e seen as a wedge-shaped, rugose de
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process appears as solid bone. Admi
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16) for P. tricuspidens and Rose (1
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DENTAL FUNCTIONAL MORPHOLOGY OF P.
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Lower premolar molarization As indi
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SUMMARY AND CONCLUSION The skull of
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REFERENCES Bloch, J.I., Boyer, D.M.
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TABLES Table 3.1. List of anatomica
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Table 3.2. Anatomical abbreviations
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Table 3.3. Size comparison among pl
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Table 3.4 continued. European plesi
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Figure 3.1. Cranium of Plesiadapis
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Figure 3.3. Right maxillary teeth (
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Figure 3.8. Fragment from right nuc
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Figure 3.9. Right promontorium of P
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Figure 3.12. Right dentary of Plesi
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Figure 3.14. A, Plot of relief inde
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CHAPTER 4: THE FIRST KNOWN SKELETON
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among plesiadapiforms (e.g., Szalay
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Institutional and collections abbre
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CaL - capitulum (of humerus) antero
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HSV - head shape variable = ln(DEW/
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MSD - mid-shaft dorsoventral or ant
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Ry - ray (as in “digit ray”) S-
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History of descriptive study of the
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illustrations of this material, exc
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astragalus and calcaneum was highly
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discussion of the femur indicates t
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supinator crests. He also noted tha
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that it may not even be an archonta
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unstudied material. Specifically, h
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5321), some metapodials (MNHN R 529
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Gingerich and Gunnell (1992) publis
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prehensility they provide, is an in
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euarchontans (Fig. 1.1). Their anal
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for comparison. These include isola
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plesiadapid samples have the same m
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Organization of results Each bone i
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Bloch and Boyer (2002) and N. inter
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clavicle reflects some basic aspect
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Humerus Description.—The right an
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epicondyle actually projects somewh
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cookei is absolutely longer than an
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tuberosity. This crest probably del
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olecranon process to estimate its t
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distinct, convex distal radial face
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of the midcarpal joint), and its pr
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(there is no evidence for more than
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matches the opposing facet on the t
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mobility at the trapezoid-trapezium
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Function.—The three proximal carp
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the bone presently being described:
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the “set 2” MC II is a larger,
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differs from MC II and III in havin
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even more pronounced. The distal en
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etween the distal carpals and the
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have stouter shaft diameters for th
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difference makes them more like kno
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antipronograde clinging postures, o
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foramina, and faces slightly proxim
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spine at the superior tip of the il
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the thigh (Gambaryan, 1974). The ha
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The femoral shaft is smooth, lackin
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lacking a lateral extension of its
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The anteromedial side of the tibial
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fibular notch and the strong crest
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to the peroneal surface. The perone
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could even be described as having t
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Function.—The functional features
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flexor fibularis groove surface. Ex
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tubercle, which is centrally locate
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Cuboid Description.—The right cub
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Ectocuneiform Description.—A left
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Metatarsals Hallucal metatarsal des
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articulation with the entocuneiform
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medial side facet on MT IV from a v
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Vertebral column Vertebral column d
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measurements, see caption of Fig. 4
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transverse processes, and the poste
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taxa appear to have slightly more p
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dorsoventrally than craniocaudally.
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The zygapophyses increase in size b
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vertebrae. It is also similar to th
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identifications have been reversed.
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preserved. The ribs are slender and
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Carpolestes simpsoni (UM 101963) an
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third metacarpal, similar to arbore
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autapomorphy, because it appears th
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Jenkins (1974) found that Tupaia gl
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Nannodectes and other plesiadapids,
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are consistent with more frequent u
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differences generated from informat
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Perry, M. Silcox, R. Secord and man
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ubriventer: implications for the fu
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Linnaeus, C., 1758. Systema naturae
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Stern, J.T.,Jr., 1988. Essentials o
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Table 4.3A. Measurements of the pro
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Table 4.3C. Comparative shape varia
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Table 4.5A. Measurements and shape
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Table 4.10. Measurements and shape
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Table 4.13. Measurements of plesiad
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Table 4.17B. Measurements of the di
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Table 4.18B. Measurements of the di
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Table 4.20B. Measurements 11-18 of
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Table 4.21A. Measurements 1-10 and
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Table 4.23. Measurements and shape
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Table 4.35. Body segment lengths (m
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Table 4.37A. Parameters for Gingeri
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Table 4.38C. Summary of plesiadapid
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Appendix Table 4.1B. Plesiadapis co
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Appendix Table 4.3. Other plesiadap
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Figure 4.2. Plesiadapis cookei (UM
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Figure 4.4. Plot of principal coord
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Figure 4.6. Surface reconstructions
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Figure 4.10. Surface reconstruction
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Figure 4.14. Plesiadapis cookei or
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Figure 4.17. Plot of principal coor
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Figure 4.30 472
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Figure 4.31. Measurements of astrag
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Figure 4.33 476
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Figure 4.34. Measurements of calcan
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Figure 4.40. Stereophotographic vie
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Figure 4.46. 490
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Figure 4.47 492
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Figure 4.50. 496
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Page 528 and 529: INTRODUCTION Bloch et al. (2007) an
Page 530 and 531: have a lacrimal bone that retains i
Page 532 and 533: Institutional abbreviations AMNH, A
Page 534 and 535: level cladogram. A total of 33 cran
Page 536 and 537: plesiadapiform Ignacius graybullian
Page 538 and 539: RESULTS Phylogenetic reconstruction
Page 540 and 541: Optimization of postcranial traits
Page 542 and 543: Therefore, character optimization r
Page 544 and 545: carpolestid bulla is not split into
Page 546 and 547: 2008). I therefore changed the codi
Page 548 and 549: Re-coding and optimization of crani
Page 550 and 551: and paromomyids. This, however, is
Page 552 and 553: REFERENCES Beard, K.C., 1989. Postc
Page 554 and 555: Novacek, M.J., 1986. The skull of l
Page 556 and 557: TABLES Table 5.1. Dental characters
Page 558 and 559: Table 5.2. Dental character matrix.
Page 560 and 561: asisphenoid and basioccipital bones
Page 562 and 563: 111 (p3). Deltopectoral crest of hu
Page 564 and 565: 158 (p50). Metatarsal I facet on en
Page 566 and 567: Table 5.4C. Postcranial characters
Page 568 and 569: Table 5.7. Posterior carotid forame
Page 570 and 571: Figure 5.2. 542
Page 572 and 573: Figure 5.3 544
Page 574 and 575: Figure 5.4. Plot of posterior carot
Page 576 and 577: ostral end of the nasals) and prema
Page 580 and 581: vertically-to-caudally projecting t
Page 582 and 583: More generally speaking, this disse
Page 584 and 585: Figure 6.1. CT reconstruction of Pl
Page 586 and 587: BIBLIOGRAPHY Alexander, R.M., Jayes
Page 588 and 589: Coleman, M. N. and Boyer, D.M. 2008
Page 590 and 591: Godinot, M., Beard, K.C., 1991. Fos
Page 592 and 593: MacPhee, R.D.E., 1981. Auditory Reg
Page 594 and 595: Savage, D.E., Russell, D.E., 1983.
Page 596 and 597: Szalay, F.S., Drawhorn, G., 1980. E
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