Table 2 Cranial events ranked according to relative timing of onset of ossification

Premaxilla

1

1

1

2

1

1

1

1

1

1

1

2

2

2

Maxilla

1

1

1

2

1

1

1

1

1

1

1

1

2

1

Palatine

3

3

2

2

3

1

1

1

2

1

1

6

3

2

Dentary

1

1

1

1

1

1

1

1

1

1

1

1

1

1

Frontal

1

2

2

2

2

1

1

1

2

1

2

2

4

1

Parietal

4

1

3

2

1

1

1

1

1

1

1

2

4

2

Squamosal

4

3

5

2

4

2

2

2

2

2

3

2

4

2

Basioccipital

5

3

6

3

3

1

5

3

3

2

1

8

6

2

Nasal

4

3

4

2

5

1

1

6

2

2

2

7

7

3

Pterygoid

1

3

3

2

4

1

1

1

2

2

4

3

5

2

Exoccipital

5

3

6

2

4

1

2

4

4

3

1

10

7

2

Basisphenoid

4

3

8

5

6

4

3

5

7

4

6

9

9

4

Lacrimal

6

5

6

6

5

6

1

8

4

4

3

?

5

3

Alisphenoid

5

3

9

6

8

8

7

8

8

7

8

9

7

4

Orbitosphenoid

5

4

10

6

9

7

6

7

6

6

7

12

9

7

Petrosal

7

8

11

7

10

9

7

8

8

7

9

11

11

6

Mastoid

7

9

12

7

11

5

5

6

5

4

3

11

11

7

Vomer

2

3

2

2

5

1

1

1

2

1

1

8

5

2

Presphenoid

7

9

13

8

11

9

7

8

8

7

10

?

10

6

Supraoccipital

5

3

5

2

3

1

2

5

2

2

1

9

8

5

Ectotympanic

6

6

6

4

7

3

2

8

6

5

5

5

6

3

Goniale

6

7

7

6

8

6

4

8

2

5

7

4

6

?