Dysagrionites, Archibald & Cannings

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 : 106-108

Dysagrionites sp. B

Fig. 64 .

Material. RBCM P1554 ( Fig. 64 ), the proximal half of a wing, damaged, apparently torn along or near RP3-4 , which is missing or obscured. Collected at Driftwood Canyon Provincial Park by SBA, 10.viii.2002, housed in the Royal British Columbia Museum collections .

Description of RBCM P1554. A somewhat damaged proximal portion of a wing. Length, width undeterminable by preservation. As in diagnosis and the following. Crossveins in postnodal, postsubnodal spaces aligned in preserved region. IR1 originates two, maybe three cells distal to origin of RP2. RP2 originates 2.5 cells distal to origin of IR2. IR2 originates at subnodus. RP3-4 is missing, wing damaged. MA linear to level of origin of IR1, not preserved distal to this. MP linear, rather straight from quadrangle to level of origin of IR2, not preserved distal to this. CuA slightly zigzagged distal to level of subnodus, little preserved distal to this. CuA–A space at least three cells wide by level of subnodus, at least two briefly proximal to this.

Range and age. Okanagan Highlands shale at Driftwood Canyon Provincial Park, British Columbia, Canada; mid-Ypresian.

Discussion. This damaged proximal half of a wing may be separated from those of other species of Dysagrioninae except Primorilestes madseni by infuscate membrane probably from the level of Ax1 (possibly proximal to this?) to the furthest preserved potion distal to the origin of IR1. The portion preserved is most easily distinguished from P. madseni by being narrower between the quadrangle and the posterior margin.Although it is distinct by these traits, we do not name this species by the very damaged and incomplete condition of its only known fossil. It is of particular interest as the only known odonate fossil of the Okanagan Highlands from Driftwood Canyon, indeed, the only one north of McAbee, some 600 kilometres to the southeast of Driftwood Canyon Provincial Park.

Figures

FIGURE 64. Dysagrionites sp. B, RBCM P1554. A, photograph; B, drawing. Both to scale, 5 mm.