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Fossil platanistoid dolphin: Tables

TABLE 1. Measurements in mm of holotype, OU 22306, Otekaikea huata : skull and mandibles. Dimensions follow Fordyce et al. (2002) and Perrin (1975). Measurements are rounded to the nearest 0.5 mm. For skull and mandible, distances are either horizontal or vertical, unless identified as point to point. + means measurements of preserved distances of broken part.

Skull

 
total length, from the most anterior point to posterior of occipital condyles 790.0+
cranial length 222.0+
width of premaxillae at a line across posterior limits of antorbital notches 39.0+
maximum width of premaxillae about the level with mid-orbit 127.5
preorbital width, at level of frontal-lacrimal suture 209.0+
postorbital width, across apices of postorbital processes 252.0+
maximum width across narial aperture 68.5
median length of nasals on vertex, point to point 7.5
maximum length of right nasal on vertex 31.5
median length of frontals on vertex 35.0
greatest width of right temporal fossa, measured to external margin of rised suture 60.5
greatest width of right temporal fossa at right ange to greatest length 114.0
mediolateral diameter of right temporal fossa proper 82.0
anteroposterior diameter of right temporal fossa proper 64.5
distance from posterior of occipital condyle to anterior apex of supraoccipital 38.5
vertical external height of skull, from most ventral part of braincase on basioccipital crest, to dorsal extremity of frontal at vertex 160.0
bizygomatic width 265.0
bicondylar width 85.5
Mandibles  
maximum preserved length of left mandible 533.0+
maximum preserved height of left mandible 116.0+
height of condyloid process -
width of condyloid process -

TABLE 2. Measurements in mm of holotype, OU 22306, Otekaikea huata : periotic and tympanic bulla. Dimensions follow Fordyce et al. (2002), Perrin (1975), and Kasuya (1973). Measurements are rounded to the nearest 0.5 mm. For skull and mandible, distances are either horizontal or vertical, unless identified as point to point.

Periotic

  
maximum anteroposterior length, from anterior apex of anterior process to apex of posterior process 44.0
maximum anteroposterior length parallel to dorsal margin 43.0
maximum dorsoventral depth anterior process, perpendicular to axis of periotic 15.0
length of anterior process, from anterior apex to level of posterior of mallear fossa 22.5
length of anterior process, from anterior apex of anterior process to level of anterior of pars cochlearis in notch immediately lateral to fine ridge 14.5
dorsoventral depth at fovea epitubaria 1.5
length facet on posterior process point to point 17.5
facial canal anteroposterior diameter 2.0
maximum width of anterior process at base 11.5
approximate anteroposterior length of pars cochlearis 18.0
approximate transverse width of pars cochlearis, from internal edge to fenestra ovalis 10.5
transverse width of periotic, internal face of pars cochlearis to apex of lateral tuberosity 22.0
length of posterior process of periotic 18.5
length of posterior process parallel to posterior profile/ steeply acute to long axis of body 18.0
Tympanic bulla  
width of sigmoidal process 14.0
height of sigmoidal process 8.5

TABLE 3. Measurements in mm of holotype, OU 22306, Otekaikea huata : postcranial elements. Dimensions follow Fordyce et al. (2002) and Perrin (1975). Measurements are rounded to the nearest 0.5 mm. For skull and mandible, distances are either horizontal or vertical, unless identified as point to point. + means measurements of preserved distances of broken part.

Atlas    
maximum preserved length 63.0  
maximum preserved height 70.5+  
maximum preserved width 101.0+  
length of body 60.0  
height of anterior articular surface 48.5  
width of anterior articular surface 90.0  
height of posterior articular surface 47.5  
width of posterior articular surface 87.5  
Axis    
maximum preserved height 76.0  
maximum preserved width 129.0  
length of body 55.5  
length of dens 23.0  
height of anterior articular surface 36.0  
width of anterior articular surface 88.5  
height of posterior articular surface 49.0  
width of posterior articular surface 54.5  
4th cervical vertebra    
maximum preserved length 39.5  
maximum preserved height 88.0+  
maximum preserved width 80.5+  
length of neural spine 79.0+  
height of neural spine 11.0+  
length of body 28.0  
height of anterior articular surface 47.0  
width of anterior articular surface 45.5  
height of posterior articular surface 40.5  
width of posterior articular surface 46.5  
5th cervical vertebra    
maximum preserved length 28.5+  
maximum preserved height 71.5+  
maximum preserved width 98.0+  
length of body 27.0  
height of anterior articular surface 51.5  
width of anterior articular surface 51.5  
height of posterior articular surface 49.0  
width of posterior articular surface 51.0  
6th cervical vertebra    
maximum preserved height 74.0+  
maximum preserved width 85.5+  
length of body 26.5  
height of anterior articular surface 44.0+  
width of anterior articular surface 47.0  
height of posterior articular surface 47.0+  
width of posterior articular surface 46.5+  
Thoracic vertebra 1 in Fig. 14    
maximum preserved height 66.0+  
maximum preserved width 107.0+  
length of body 32.0  
Thoracic vertebra 2 in Fig. 14    
maximum preserved length 49.0+  
maximum preserved height 120.0+  
maximum preserved width 89.0+  
length of neural spine 23.0+  
height of neural spine 49.5+  
length of body 44.0  
Thoracic vertebra 3 in Fig. 14    
maximum preserved length 83.5+  
maximum preserved height 128.0+  
maximum preserved width 83.5+  
length of neural spine 56.5+  
height of neural spine 49.0+  
length of body 58.0  
Thoracic vertebra 4 and 5 in Figure 14  
maximum preserved length 73.5+  
maximum preserved height 95.5+  
maximum preserved width 81.5+  
length of neural spine 52.0+  
height of neural spine 16.0+  
length of body 63.0  
Thoracic vertebra 6 in Figure 14    
maximum preserved height 60.5+  
maximum preserved width 244.0+  
length of body 74.5  
Scapula left right
maximum preserved length of the left 284.0+ 328.0
maximum preserved height of the left 118.0+ 224.0
length of acromion process 79.0+ 95.5+
length of glenoid fossa 52.5 50.5
width of glenoid fossa 47.5 48.5
depth of glenoid fossa 10.0 9.0
Humerus left right
Length 153.0 151.0
narrowest length of shaft 55.0 56.0
width of shaft at the narrowest point 39.5 41.5
Ulna left right
Length - 146.0
length without olecranon process - 103.0
narrowest length of shaft - 40.0
width of shaft at the narrowest point - 21.0
Radius left right
Length 115.0 120.0
narrowest length of shaft 34.0 37.0
width of shaft at the narrowest point 26.5 27.5
Sternum    
preserved length 97.0+  
preserved widest width 86.5+  
preserved narrowest width 58.0+