Boyer diss 2009 1046..

Boyer diss 2009 1046.. Boyer diss 2009 1046..

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Figure 2.31. 156

Figure 2.31. MNHN CR 126, Plesiadapis tricuspidens: A, lateral view of right cranial midface fragment. B, ventral view. C, dorsal view. D, anterior view. E, drawing of dorsolateral view. F, dorsolateral view. G, enlargement of anterior region from part F. H, enlargement of posterior region from part F. Note that bone labeled “Mx?” can only be considered as “maxilla” if (1) there is a suture spanning between 132 and 133 close to the ppc, and (2) the labeled, more anterior part of 133 actually represents a crack. A suture spanning 132 and 133 is not clearly visible. The existence of a ridge of bone on the Pellouin skull that would correspond to the anterior part of the maxillary process of 133 suggests that 133 may not be a crack in this region. If neither (1) or (2) are true then “Mx?” would actually correspond to the palatine. If only (1) is true then “Mx?” may represent an ethmoid os planum. Numbers and abbreviations: 132 – Frontal/maxilla suture in orbit, 133 – crack or maxilla/palatine suture?, 134 – region of palatine/frontal contact in postpalatine canal (broken), 135 – lacrimal foramen, 136 – lacrimal/frontal suture, 137 – lacrimal/maxilla suture. Fr – frontal; iof – infraorbital foramen; Lc – lacrimal; Mx – maxilla; Mx? – possible fragment of maxilla; Pal – palatine; zys – sutural surface on maxilla for zygomatic. 157

Figure 2.31. MNHN CR 126, Plesiadapis tricuspidens: A, lateral view of right cranial<br />

midface fragment. B, ventral view. C, dorsal view. D, anterior view. E, drawing of<br />

dorsolateral view. F, dorsolateral view. G, enlargement of anterior region from part F. H,<br />

enlargement of posterior region from part F. Note that bone labeled “Mx?” can only be<br />

considered as “maxilla” if (1) there is a suture spanning between 132 and 133 close to the<br />

ppc, and (2) the labeled, more anterior part of 133 actually represents a crack. A suture<br />

spanning 132 and 133 is not clearly visible. The existence of a ridge of bone on the<br />

Pellouin skull that would correspond to the anterior part of the maxillary process of 133<br />

suggests that 133 may not be a crack in this region. If neither (1) or (2) are true then<br />

“Mx?” would actually correspond to the palatine. If only (1) is true then “Mx?” may<br />

represent an ethmoid os planum. Numbers and abbreviations: 132 – Frontal/maxilla<br />

suture in orbit, 133 – crack or maxilla/palatine suture?, 134 – region of palatine/frontal<br />

contact in postpalatine canal (broken), 135 – lacrimal foramen, 136 – lacrimal/frontal<br />

suture, 137 – lacrimal/maxilla suture. Fr – frontal; iof – infraorbital foramen; Lc –<br />

lacrimal; Mx – maxilla; Mx? – possible fragment of maxilla; Pal – palatine; zys – sutural<br />

surface on maxilla for zygomatic.<br />

157

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