THE EVOLUTIONARY HISTORY AND PHYLOGENETIC RELATIONSHIPS OF THE SUPERFAMILY PLATANISTOIDEA - Biology, Evolution and Conservation of River Dolphins Within South America and Asia - page 451

Figure 1 . Cranium of the holotype of the first recognized species of the North Pacific platanistoid
family Allodelphinidae, Allodelphis pratti Wilson, 1935, of earliest Miocene age, central California,
U.S.A.; A , dorsal view; B , left lateral view; C , ventral view; D, posterior view. Allodelphis pratti is the
type species of the genus Allodelphis Wilson, 1935, which is the type genus of the family
Allodelphinidae; scale bar equals 10 cm; anatomical abbreviations are: bc-basioccipital crest,
Boc-basioccipital bone, fmxp-posterior maxillary foramen, Fr-frontal bone, gf-glenoid fossa, lc-
lambdoidal crest, Me-mesethmoid bone, mrg-mesorostral groove, Mx-maxillary bone, Na-nasal bone,
n-narial passage (or naris), nc-nuchal crest, occ-occipital condyle, pgl-postglenoid process, Pmx-
premaxillary bone, pop-paroccipital process, Pt(ll)-lateral lamina of the pterygoid bone, pts-fossa for
pterygoid sinus, Vo-vomer bone, zp-zygomatic process of the squamosal bone.