I have been terribly busy, so a response to the thread could not be mounted earlier. My apologies.
Our basis to using a Hellenistic unit exclusively to the Arsacids is simple; not only was the effective "de-Hellenization" of the Greater Iran a later process (Which took place first during the rule of Vologases I), as indicated by a more "home-grown" minting technique giving the ruler a more Persepolitan profile, but also by later Sassanian and Medieval Zoroastrian legends recalling the codification of the Avestâ taking place during his rule (51-78 CE). In comparison to previous Arsacid sovereigns he appears to be of profoundly "Oriental" character, once even narrated to have been mounted upon an elephant before the Romans in a triumph. This is obviously outside the frame of time, so some information can be mined out from the historical rift between rulers; in fact as far as the rule of Orodes II, there is still a Graeco-Seleucian senate recorded in Plutarch's biography of Crassus, and the nature of this senate of course differs too much from the so-called "Council of Clans" to ever have been confused. So even as far as 50 BCE we have a secure attestation of profound Graeco-Macedonian political influence in especially Mesopotamia even thought the power must rather have been divided accordingly per city.
So, how does this aid our projection of a Hellenistic-style thureos infantry? Well, it gives us a couple of parameters to keep ourselves within. The Parthohellenikoi Thureophoroi draw inspiration from two sources, one which appears to keep within "Hellenistic tradition" (Classically Hellenistic-styled helmets, linothorakes, pteryges et al.) and the other which introduces Aramaean character in the attire. I am partially speaking of a trend which survived far into the Trajanid age (Which can be indicated in the "Parthia Capta" coins of emperor Trajan) and partially of the facsimile at Dura-Europos showing armoured infantry with coifs of maille. The only slight anomaly in the unholy union between the two types is the armour, which is padded leather, reasoned to have been more apt in the Mesopotamian heat and less susceptible to organic rot; originally I personally wanted to go with a linothorax or alternatively a scale corselet. The ethnicity has deliberately been left ambiguous therefore. He could be a Greek-speaking foreigner, maybe an Armenian, maybe an Aramaïc-speaking local, or perhaps even an Iranian. The shield bears a Clan-insignia implying that the infantry is bandakâ/bandegân (Bondsman) and therefore serves under a noble. This is due to change and an intellectual admission must be made; infantry were reared in the cities and in the proper satrapies, whereas the clans dominated more in eastern and northern Iran.
As for "Parthian phalangites", there is evidence for them, but curiously after a time of inactivity I have forgotten where the information is localized; the so-called "all-cavalry" doctrine of the Parthians is far from definite and in one instance we do know that Phraates II used Greek soldiery, who notoriously turned over him to the Tocharii who smote him (Apparently, there was a reason; even the Persians of Persis proper and Kamnaskirids of Elymaïs initially thought of the Arsacidae to have been a cruel lot). I recall that this statement has circulated around the Internet, claiming that in one instance Parthian phalangites matched the spears of the Seleucids. If true, it is not indicative to Parthian infantry. These may have been mercenaries.
MeinPanzer mentions the Oriental-looking cavalry of the Tarentine or Prodromoi type; I think he means the numerous Palmyran reliefs showing Parthian-style cavalry dressed in elaborate flowing robes and mantles, brandishing enigmatic hair-styles. Such as this one:
These are the effective continuation of the classical Persepolitan-style Parthian dress (There is an Arsacid-era equestrian bas-relief matching the Parthava dignitaries here; compare to Persepolitan dignitaries).
The Cardaces are a declining form of late Achaemenid-style infantry who were added simply on the basis of Strabo's passage, implying local longevity in areas which did rear quite strong foot-warrior traditions (Persis proper).From the late Arsacid to early Sassanian era, most of that tradition would be lent from Graeco-Roman foundations.
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