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Table 3.

Results of the discriminant function analyses (DFA) performed on the kinematics of movements in Tupinambis merianae for intraoral transport and pharyngeal packing of large and small prey

Intraoral transportPharyngeal packing
Cervical Eigenvalues 1.58 Eigenvalues 2.86 
 Total rotation of the head –0.56 Maximal neck slope 
 Time to maximal neck slope 0.68   
 Head angle at the onset of mouth opening 0.58   
 Pinkies (89.8%) 1.09 Pinkies (91.5%) 1.59 
 Mice (77.6%) –1.35 Mice (97.1%) –1.69 
Jaws Eigenvalues 0.62 Eigenvalues 1.45 
 Maximal gape Maximal gape 
 Pinkies (72.7%) –0.69 Pinkies (85.5%) –1.13 
 Mice (71.6%) 0.85 Mice (77.9%) 1.20 
Tongue Eigenvalues 0.37 Eigenvalues 2.00 
 Time to maximal contraction of the pharynx Speed of retraction 0.91 
   Time to maximal inflation of the pharynx –0.53 
 Pinkies (68.4%) –0.47 Pinkies (87.73%) 1.19 
 Mice (56.7%) 0.71 Mice (88.68%) –1.54 
Integrative Eigenvalues 2.20 Eigenvalues 6.56 
 Total rotation of the head –0.90 Maximal neck slope 0.93 
 Time to maximal neck slope 0.93 Speed of retraction 0.50 
   Time to maximal inflation of the pharynx –0.70 
 Pinkies (94.2%) 1.15 Pinkies (99.9%) 2.15 
 Mice (80.0%) –1.72 Mice (99.9%) –2.79 
Intraoral transportPharyngeal packing
Cervical Eigenvalues 1.58 Eigenvalues 2.86 
 Total rotation of the head –0.56 Maximal neck slope 
 Time to maximal neck slope 0.68   
 Head angle at the onset of mouth opening 0.58   
 Pinkies (89.8%) 1.09 Pinkies (91.5%) 1.59 
 Mice (77.6%) –1.35 Mice (97.1%) –1.69 
Jaws Eigenvalues 0.62 Eigenvalues 1.45 
 Maximal gape Maximal gape 
 Pinkies (72.7%) –0.69 Pinkies (85.5%) –1.13 
 Mice (71.6%) 0.85 Mice (77.9%) 1.20 
Tongue Eigenvalues 0.37 Eigenvalues 2.00 
 Time to maximal contraction of the pharynx Speed of retraction 0.91 
   Time to maximal inflation of the pharynx –0.53 
 Pinkies (68.4%) –0.47 Pinkies (87.73%) 1.19 
 Mice (56.7%) 0.71 Mice (88.68%) –1.54 
Integrative Eigenvalues 2.20 Eigenvalues 6.56 
 Total rotation of the head –0.90 Maximal neck slope 0.93 
 Time to maximal neck slope 0.93 Speed of retraction 0.50 
   Time to maximal inflation of the pharynx –0.70 
 Pinkies (94.2%) 1.15 Pinkies (99.9%) 2.15 
 Mice (80.0%) –1.72 Mice (99.9%) –2.79 

Analyses were performed on kinematic data sets for the cranio-cervical, jaw and hyolingual movements separately, as well as for a combined data set including all discriminating variables. The proportion of cycles correctly classified is indicated between parentheses

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