ammonites
Archoblattina beecheri Sellards 1903

Archoblattina - Archoblattinidae

Holotype in YPM

Alternative combination: Megablattina beecheri

Belongs to Archoblattina according to A. Handlirsch 1906

Sister taxa: Archoblattina boulei, Archoblattina clarkii, Archoblattina fontaniensis, Archoblattina helvetica, Archoblattina marcellini, Archoblattina maxima, Archoblattina scudderi

Type specimen: YPM 221077, an exoskeleton. Its type locality is Mazon Creek (YPM collection), which is in a Westphalian D deltaic mudstone in the Carbondale Formation of Illinois.

Average measurements (in mm): tegmen length 70.0