Stenodiafanus westersidei Archibald & Cannings, 2021

Archibald, Bruce, Cannings, Robert A., Erickson, Robert J., Bybee, Seth M. & Mathewes, Rolf W., 2021, The Cephalozygoptera, a new, extinct suborder of Odonata with new taxa from the early Eocene Okanagan Highlands, western North America, Zootaxa 4934 (1), pp. 1-133 : 102

Stenodiafanus westersidei Archibald & Cannings , new species

Fig. 61 .

Diagnosis. As for genus.

Material. Holotype: SR 06-01-42, collected at Republic B 4131 by Steven Westerside, 15.viii.2005, housed in the Stonerose Interpretive Center collections.

Description. Holotype, sex unknown. SR-06-01-42, wing ( Fig. 61 ). Hyaline, narrow; nodus to apex 24.8 mm, width 5.8 mm. 18 postnodal crossveins, about half aligned with postsubnodal crossveins, mostly the proximal third. Pterostigma pale, four times longer than wide. Costal space apical to pterostigma one cell wide for one cell, then two. Oblique brace vein present, connecting to proximal corner of pterostigma, oblique. RA–RP1 space one cell wide except for a few adventitious crossveins. RP1–IR1, RP2–IR2, IR2–RP3-4 spaces become two cells wide about half distance from origin of IR1 to pterostigma; IR1–RP2 space becomes two cells wide shortly distal to this. RA, RP1, IR1, RP2 converge, almost meeting at apex (only six cells likely along margin between RA, RP2). RP2 origin about quarter distance between nodus, pterostigma. IR2: origin at level of subnodus, slightly zigzagged in distal quarter. RP3-4: origin proximal to, near nodus; rather straight from level of nodus to terminus on margin at level of distal end of pterostigma. MA linear from level of nodus (not preserved proximal to that) to about half way to level of pterostigma, then zigzagged to margin, about 3-4 nodus to pterostigma levels. MP preserved from level of nodus: rather straight to slight curve near terminus on margin. CuA preserved from just proximal to origin of RP2, zigzagged to margin.

Etymology. The specific epithet is a patronymic formed from the surname of Steven Westerside, the collector and donor of the holotype, recognising his contribution.

Range and age. Tom Thumb Tuff Member of the Klondike Mountain Formation, locality B4131 at Republic, Washington, USA; late Ypresian.

Figures

FIGURE 61. Stenodiafanus westersidei holotype, SR-06-01-42. A, photograph; B, drawing. Both to scale, 5 mm.