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Several genera that may have been synonymized with Iguanodon on the basis
of similarities with I. atherfieldensis include: Heterosaurus, Therosaurus,
Vectisaurus, and Sphenospondylus.
It was my impression_Therosaurus mantelli_ (= _Iguanodon mantelli_) was a
junior objective synonym of _Iguanodon anglicus_. Both species are _nomina
dubia_, based on the same indeterminate type material. _Therosaurus_
appears to be an arbitrary renaming of _Iguanodon_. Thus, Fitzinger's
_Therosaurus_ can be removed from contenton.
However, _Heterosaurus neocomiensis_, _Vectisaurus valdensis_, and
_Sphenospondylus gracilis_ have all been considered subjective junior
synonyms of _I. atherfieldensis_; and as the type species for their
respective genera, all three offer possible available generic names for _I.
atherfieldensis_. I'm not certain that _S. gracilis_ is a valid species,
but the other two are based on decent material. Whether they pertain to the
same species as _I. atherfieldensis_ is another matter. As George notes, if
they are, the species names would have priority over _atherfieldensis_.
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