In their 1997 paper, Laurent and colleagues referred additional remains (jaw material, vertebrae, and limb bones of multiple individuals of different ages) from the Le Bexen site of the uppermost Cretaceous of Aude, southern France, to the genus.
Prieto-Márquez and colleagues commented on this referral in a 2006 paper, though noting they had not examined the material themselves.
They concluded all of the specimens, excepting one fragmentary humerus, were too poorly preserved to allow proper comparison with the Spanish Pararhabdodon material, and so disagreed with the referral.
Of the humerus, they found it was distinguishable from P. isonensis, and so also not referable to the species.
A group composed of some of the same authors as the 2006 study, including Prieto-Márquez, investigated the material first hand for a 2013 re-evaluation of all European lambeosaurine material, and supported their previous conclusions.
Laurent had, in a 2003 dissertation, referred more French lambeosaurine material to Pararhabdodon; in this case, material held at the Musée des Dinosaures d’Espéraza.
The referral was made as the genus was, at that point, the only lambeosaurine named from the continent.
Prieto-Márquez et al. (
2013) used this material to establish their new taxon, Canardia garonnensis.

In 2013, a maxilla, specimen designation MCD 4919, was referred to P. isonensis.
It possessed synapomorphies of the tsintaosaurin tribe to which Pararhabdodon was by that point assigned to, and was referable to Pararhabdodon in particular due to rostrocaudally broad rostrocaudal region of the maxilla, a trait unique to P. isonensis relative to Tsintaosaurus, the other named tsintaosaurin taxon.
The specimen was discovered at the Serrat del Rostiar 1 locality, part of the Conques Formation.
This is part of the Tremp Group just like the type locality, SRA, but in a lower section of the strata, making it older.
Thus, the referral to Pararhabdodon extended the range of genus further within the upper Maastrichtian.
The Serrat del Rostiar 1 locality is near the village of Basturns.
In 2019, the new genus and species Adynomosaurus arcanus was described, and in the paper describing the referral of MCD 4919 to P. isonensis was questioned.
The specimen was found to have a differing ectopterygoid shelf compared to the maxilla of the SRA Pararhabdodon, which would conflict with their identity as belonging to the same species.
As the specimen was still recognized as having tsintaosaurin characteristics, the authors still considered it to likely belong to a close relative of P. isonensis.

The same study also evaluated Blasisaurus canudoi, from the Blasi 1 locality of the underlying Arén Formation, and Arenysaurus ardevoli, from the Blasi 3 locality of the La Posa Formation, another part of the Tremp Group.
Previously claimed diagnostic traits of the two taxa were shown to be found in other hadrosaurs.
This left the former with two unique characteristics - both in the jugal - and a unique combination of other characteristics, and the latter with only one unique characteristic - in the frontal.
As overlapping fossils were not known for the relevant areas, it couldn't be ruled out that they were indeed synonymous, representatives of a single species.
The same re-evaluation could not rule out that this single species or either of the separated species were synonyms of Pararhabdodon isonensis, as no taxonomically informative areas of the skeleton are known from both Pararhabdodon and the other two taxa.
The authors refrained from considering any of them representatives of one species pending data from more material.

A hadrosaur mega-bonebed, later termed the Basturs Poble bonebed, was discovered in outcrops of the Conques Formation during the late 1990s.
The taxonomic status of this bonebed has fluctuated over time.
It has been debated whether the material represents a singular species or a combination of two distinct ones; but today a single, variable species is considered most likely.
It was suggested the material likely belong to Koutallisaurus, based on geograp
In their 1997 paper, Laurent and colleagues referred additional remains (jaw material, vertebrae, and limb bones of multiple individuals of different ages) from the Le Bexen site of the uppermost Cretaceous of Aude, southern France, to the genus. Prieto-Márquez and colleagues commented on this referral in a 2006 paper, though noting they had not examined the material themselves. They concluded all of the specimens, excepting one fragmentary humerus, were too poorly preserved to allow proper comparison with the Spanish Pararhabdodon material, and so disagreed with the referral. Of the humerus, they found it was distinguishable from P. isonensis, and so also not referable to the species. A group composed of some of the same authors as the 2006 study, including Prieto-Márquez, investigated the material first hand for a 2013 re-evaluation of all European lambeosaurine material, and supported their previous conclusions. Laurent had, in a 2003 dissertation, referred more French lambeosaurine material to Pararhabdodon; in this case, material held at the Musée des Dinosaures d’Espéraza. The referral was made as the genus was, at that point, the only lambeosaurine named from the continent. Prieto-Márquez et al. (2013) used this material to establish their new taxon, Canardia garonnensis.
In 2013, a maxilla, specimen designation MCD 4919, was referred to P. isonensis. It possessed synapomorphies of the tsintaosaurin tribe to which Pararhabdodon was by that point assigned to, and was referable to Pararhabdodon in particular due to rostrocaudally broad rostrocaudal region of the maxilla, a trait unique to P. isonensis relative to Tsintaosaurus, the other named tsintaosaurin taxon. The specimen was discovered at the Serrat del Rostiar 1 locality, part of the Conques Formation. This is part of the Tremp Group just like the type locality, SRA, but in a lower section of the strata, making it older. Thus, the referral to Pararhabdodon extended the range of genus further within the upper Maastrichtian. The Serrat del Rostiar 1 locality is near the village of Basturns. In 2019, the new genus and species Adynomosaurus arcanus was described, and in the paper describing the referral of MCD 4919 to P. isonensis was questioned. The specimen was found to have a differing ectopterygoid shelf compared to the maxilla of the SRA Pararhabdodon, which would conflict with their identity as belonging to the same species. As the specimen was still recognized as having tsintaosaurin characteristics, the authors still considered it to likely belong to a close relative of P. isonensis.
The same study also evaluated Blasisaurus canudoi, from the Blasi 1 locality of the underlying Arén Formation, and Arenysaurus ardevoli, from the Blasi 3 locality of the La Posa Formation, another part of the Tremp Group. Previously claimed diagnostic traits of the two taxa were shown to be found in other hadrosaurs. This left the former with two unique characteristics - both in the jugal - and a unique combination of other characteristics, and the latter with only one unique characteristic - in the frontal. As overlapping fossils were not known for the relevant areas, it couldn't be ruled out that they were indeed synonymous, representatives of a single species. The same re-evaluation could not rule out that this single species or either of the separated species were synonyms of Pararhabdodon isonensis, as no taxonomically informative areas of the skeleton are known from both Pararhabdodon and the other two taxa. The authors refrained from considering any of them representatives of one species pending data from more material.
A hadrosaur mega-bonebed, later termed the Basturs Poble bonebed, was discovered in outcrops of the Conques Formation during the late 1990s. The taxonomic status of this bonebed has fluctuated over time. It has been debated whether the material represents a singular species or a combination of two distinct ones; but today a single, variable species is considered most likely. It was suggested the material likely belong to Koutallisaurus, based on geograp
Pararhabdodon