Above: Stereopterum cf rotundum Carpenter, 1950. Specimen B3-03-20-04-12, collected
20 March, 2004 by Roy J. Beckemeyer at Billings 3 Locality, Noble County,
Oklahoma, Lower Permian Wellington Formation. First record of this
taxon from the Oklahoma beds (described from the Elmo deposits).
Maximum width approx. 5 mm. SC intersects costal margin distal to
midwing. Space between RA and SC very broad. Portion of wing
membrane posterior to RA and distal to CuA heavily coriaceous, with a pebbled
texture. Main longitudinal veins RP, MA and MP become weak distally, are
heavier near their origins. Space between RP and MA constricted where they
are connected by a cross vein. Anterior branch of CuA forks four
times.
Additional rock matrix to be removed from base and anal area of wing.
Left: Figure from Carpenter, 1950, Proc. Am. Acad. Arts & Sci.,
78(4):185-219.