Boyer diss 2009 1046..

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with a vertex of the triangle (or the apex of the pear) pointing radially. The radius facet meets the lunate facet (Figs. 4.7A, 4.8: 3) at its ulnar margin and the two surfaces form an angle of ~90º with one another here. In ulnar view, parallel to the surface of the lunate facet, the lunate facet meets the facet for the distal carpals at its distal margin (Figs. 4.7A, 4.8: 2), and these two surfaces form an angle of around 100º. It is also apparent in ulnar view that the distal carpal articular surface of the scaphoid is not entirely parallel to the radius facet. In fact, the average tangent of the concave distal articular surface differs from that of the proximal radius surface by ~45°, such that these surfaces deviate in their orientation, from proximal or distal, to somewhat dorsal with respect to one another. In distal view, the distal articular surface is triangular in outline; its radial apex reaches the radiodistal tip of the scaphoid tubercle and continues onto it. Dorsal to the distal carpal surface is a flat, distally facing shelf (Fig. 4.7A, 4.8: 1) that may have articulated with bones of the distal carpal row during extremely dorsiflexed postures of the mid-carpal joint. The smooth, articular bone of the radial margin of the distal carpal articular surface continues proximally onto the radial and ventral aspects of the scaphoid tubercle (Figs. 4.7A, 4.8). A prepollex or radial sesamoid (Haines, 1955) may have articulated here. Radioventral to the lunate surface another tuberosity is formed. This bump is thus located ulnar to the scaphoid tubercle. A distinct groove, which likely transmitted tendons of the flexor compartment (e.g., flexor pollicis longus), is present between the two tuberosities. Function.—The most salient functional features of the scaphoid are its dorsally inclined distal articular surface for the capitate, centrale and probably hamate (in certain postures), the shelf-like surface on its dorsal aspect (that probably reflects hyperextended 298
of the midcarpal joint), and its prominent tubercle, the large size of which could have helped increase the volume of the carpal tunnel. Comparison.—The scaphoid of P. cookei is nearly identical to that of N. intermedius (Fig. 4.8). This is significant because Beard (1993a) interpreted N. intermedius as having a facet for the lunate on its “distal surface” as well as a facet for the triquetrum on its lateral surface. This interpretation is fundamentally incorrect, as implied by the description above and as illustrated in Figure. 4.8. The interpretation used here is supported by a number of other lines of evidence that will be presented throughout subsequent descriptions and comparisons. Beard’s interpretation was initially plausible because (1) the N. intermedius scaphoid is incompletely preserved, allowing for more speculation about the missing morphology; (2) the morphology of the bone he incorrectly identified as the lunate fit his expectations of what it should be under his interpretation of the scaphoid morphology, and (3) the complete carpus was not available to allow an assessment of whether this interpretation could “work” in an articulated specimen. Lunate Description.—The lunate is typical in its form. That is, from radial or ulnar view it appears as a “crescent moon,” with a convex proximal end and a concave distal end for the distal carpal row (Figs. 4.7B, 4.9A). Its maximum dorsoventral depth is 5.1 mm, while its mediolateral width is 2.3 mm. From dorsal view it appears wedge-shaped because the scaphoid facet is shorter (1.8 mm) than the ulnar side (2.5 mm). Therefore, when articulated with the scaphoid, its distal surface faces slightly radially: together the combined distal surface of the lunate and scaphoid form a “cupped” surface for the distal 299
Page 1 and 2:
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
Page 275 and 276: CaL - capitulum (of humerus) antero
Page 277 and 278: HSV - head shape variable = ln(DEW/
Page 279 and 280: MSD - mid-shaft dorsoventral or ant
Page 281 and 282: Ry - ray (as in “digit ray”) S-
Page 283 and 284: History of descriptive study of the
Page 285 and 286: illustrations of this material, exc
Page 287 and 288: astragalus and calcaneum was highly
Page 289 and 290: discussion of the femur indicates t
Page 291 and 292: supinator crests. He also noted tha
Page 293 and 294: that it may not even be an archonta
Page 295 and 296: unstudied material. Specifically, h
Page 297 and 298: 5321), some metapodials (MNHN R 529
Page 299 and 300: Gingerich and Gunnell (1992) publis
Page 301 and 302: prehensility they provide, is an in
Page 303 and 304: euarchontans (Fig. 1.1). Their anal
Page 305 and 306: for comparison. These include isola
Page 307 and 308: plesiadapid samples have the same m
Page 309 and 310: Organization of results Each bone i
Page 311 and 312: Bloch and Boyer (2002) and N. inter
Page 313 and 314: clavicle reflects some basic aspect
Page 315 and 316: Humerus Description.—The right an
Page 317 and 318: epicondyle actually projects somewh
Page 319 and 320: cookei is absolutely longer than an
Page 321 and 322: tuberosity. This crest probably del
Page 323 and 324: olecranon process to estimate its t
Page 325: distinct, convex distal radial face
Page 329 and 330: (there is no evidence for more than
Page 331 and 332: matches the opposing facet on the t
Page 333 and 334: mobility at the trapezoid-trapezium
Page 335 and 336: Function.—The three proximal carp
Page 337 and 338: the bone presently being described:
Page 339 and 340: the “set 2” MC II is a larger,
Page 341 and 342: differs from MC II and III in havin
Page 343 and 344: even more pronounced. The distal en
Page 345 and 346: etween the distal carpals and the
Page 347 and 348: have stouter shaft diameters for th
Page 349 and 350: difference makes them more like kno
Page 351 and 352: antipronograde clinging postures, o
Page 353 and 354: foramina, and faces slightly proxim
Page 355 and 356: spine at the superior tip of the il
Page 357 and 358: the thigh (Gambaryan, 1974). The ha
Page 359 and 360: The femoral shaft is smooth, lackin
Page 361 and 362: lacking a lateral extension of its
Page 363 and 364: The anteromedial side of the tibial
Page 365 and 366: fibular notch and the strong crest
Page 367 and 368: to the peroneal surface. The perone
Page 369 and 370: could even be described as having t
Page 371 and 372: Function.—The functional features
Page 373 and 374: flexor fibularis groove surface. Ex
Page 375 and 376: 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
Page 471 and 472:
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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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Page 497:
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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
Page 514 and 515:
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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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INTRODUCTION Bloch et al. (2007) an
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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
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Table 5.7. Posterior carotid forame
Page 570 and 571:
Figure 5.2. 542
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Figure 5.3 544
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Figure 5.4. Plot of posterior carot
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ostral end of the nasals) and prema
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its body size would fit predictions
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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