Boyer diss 2009 1046..

Plesiadapis anceps YPM-PU 19642
The illustration of this specimen in Gingerich (1976) is adequate to show major
morphological features; new illustrations are not necessary. Some details can be added to
the description – mainly dimensions (see Tables 2.4-5). The nasals measure 21.84 mm in
length, with anterior and posterior mediolateral widths that are equal (3.34 mm). At the
anteroposterior midpoint, the bone is mediolaterally narrower (2.30 mm). The
premaxilla/frontal suture measures 4.52 mm. The premaxilla is 9.51 mm in dorsoventral
depth. The maxilla/frontal suture measures 4.6 mm. The entire anteroposterior length of
the frontals is preserved as well as the anterior margin of the parietal/frontal suture.
Thus, the length of the metopic suture can also be given at 13.08 mm.
REVISED DESCRIPTION OF FRENCH PLESIADAPID CRANIA
The remaining descriptions are of specimens and taxa that have been described in
a comprehensive and detailed fashion previously. Detailed redescriptions (like those
above) are thus unnecessary. However, questions have been raised about aspects of
morphology in these specimens since their initial descriptions, as discussed in the
introduction. Thus, I present new information (in the form of both observations and
illustrations) on these specimens in the following sections. The new information is
organized into three subsections for each specimen: one on cranial sutures, another on
cranial foramina, and a final one on more general aspects of cranial morphology.
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