ammonites
†Alexandrinia directa Carpenter 1979 (mayfly)

Insecta - Ephemerida - Protereismatidae

Figure 2 (below). Prorereisma direcium, n.sp. Drawing of fore wing (holotype). SC, subcosta; R I, radius; RS, radial sector; MA, anterior media; MP. posterior media; CUA, anterior cubitus; CUP, posterior cubitus; cb, costal brace. The convexities and concavities of the veins are shown in figure
Figure ! (above), Profereisma direerum, n.sp. Photograph of hol~type (fore wing). MC2 5180a, Permian of Oklahoma. Length of wing, 26 mm.

Alternative combination: Protereisma directum

Full reference: F. M. Carpenter. 1979. Lower Permian insects from Oklahoma part 2. Orders Ephemeroptera and Palaeodictyoptera. Psyche 86:261-290

Belongs to Alexandrinia according to N. D. Sinitshenkova and D. V. Vassilenko 2012

Sister taxa: Alexandrinia gigantea, Alexandrinia ipsa, Alexandrinia vitta

Type specimen: MCZ 5180ab, a forewing. Its type locality is Midco Locality 15, which is in an Artinskian lacustrine lime mudstone in the Wellington Formation of Oklahoma.

Ecology:

Average measurements (in mm): forewing 28.3 x 6.5, hindwing 27.0 x 6.0, prothorax 2.00 x 4.00