. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 238 Bulletin Museum of Comparative Zoology, Vol. 139, No. 5. Figure 5. Lateral view of the skull of Chasmafosaurus vanhoepeni Haughton. (From Broili and Schroder.) Some allegedly characteristic archosau- rian character-states, such as upright stance and bipedalism, are not included in this list. As has been suggested by Charig (1965), they are neither characteristic nor widespread archosaurian features. The core of our discussion should be connected with those character-states that would help to define the Proterosuch
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 238 Bulletin Museum of Comparative Zoology, Vol. 139, No. 5. Figure 5. Lateral view of the skull of Chasmafosaurus vanhoepeni Haughton. (From Broili and Schroder.) Some allegedly characteristic archosau- rian character-states, such as upright stance and bipedalism, are not included in this list. As has been suggested by Charig (1965), they are neither characteristic nor widespread archosaurian features. The core of our discussion should be connected with those character-states that would help to define the Proterosuchia as distinct from other taxa included in the Archosauria. These character-states may be grouped in four different classes: (a) the All-proterosuchian-No-other-archo- saurian set of character states (AN), which includes peculiarities shared only by the proterosuchians, absent in any other archosaurian taxon; (b) the Some-protero- suchian-No-other-archosaurian set (SN), comprising characters that are present in the described state only in some of the proterosuchians, while present in a differ- ent state in other proterosuchians and in all the other archosaurs; (c) the All-protero- suchian - and- Some - other- archosaurian set (AS), including character-states shared by all the members of the extension of the Proterosuchia, but also present in some other non-proterosuchian archosaurs; (d) the Some-proterosuchian-and-Some-other- archosaurian set (SS), referring to those character-states shared by some, but not all the members of the Proterosuchia, and 1. (AS) 2. (AS) 3. (SN) 4. (AN) also by some, but not all, archosaurian groups not belonging to the Proterosuchia. The following list attempts to synthesize the relevant character-states of the Protero- suchia. The letters preceding each state- ment refer to the above-defined sets. A single median postparietal bone present Small postfrontal bones pres- ent A small pineal foramen present A typical otic notch not present The posterior
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