Macrostigmoraphia diluta, Jepson & Makarkin, 2023

Jepson, James E. & Makarkin, Vladimir N., 2023, Fossil Neuropterida (Insecta: Neuroptera and Raphidioptera) from the middle Eocene Kishenehn Formation, Montana, USA, Zootaxa 5306 (4), pp. 427-444 : 439

Macrostigmoraphia diluta sp. nov.

urn:lsid:zoobank.org:act:23A6E686-5B20-4BD9-B4CC-F211B33B870A

Fig. 7

Type material. Holotype USNM PAL 620478 , deposited in USNM, a distal part of a forewing .

Type locality and horizon. Middle Fork of the Flathead River , between Paola and Stanton Creeks approximately 17 miles south of West Glacier; the Coal Creek Member of the Kishenehn Formation, north-western Montana, U.S.A. The Middle Eocene (Lutetian).

Etymology. From the Latin dilutus, pale.

Description. Forewing 5.7 mm as preserved (estimated complete length 8.5 mm), 2.4 mm wide. Costal space poorly preserved, no veinlets preserved. Sc terminates on C proximad 2sc-r. Pterostigma very long (10 times as long as wide), pale, no incorporated veinlets detected within. One crossvein preserved between Sc and RA, 2sc-r, closing pterostigma proximally. RA long terminating before wing apex, with one distal veinlet closing pterostigma distally. Two crossveins between RA and RP, 2ra-rp, 3ra-rp. RP origin not preserved, RP with three branches. RP1 long forking distad irp, RP2, RP3 simple. One crossvein preserved between RP1 and RP2, irp. Between stem of RP, RP1 and MA two crossveins preserved, 2r-m, 3r-m. M origin not preserved, MA long, forking distally distad 3r-m. Two crossveins between MA and MP, 1im, 2im, forming two doi. MP partially preserved, pectinately branched, first branch proximad 1im, second between 1im, 2im. MP probably fused with CuA proximally. Cu origin not preserved. CuA partially preserved, distal part of its anterior trace and one branch. CuP, anal veins, basal part of wing not preserved.

Figures

FIGURE 7. Macrostigmoraphia diluta sp. nov., holotype USNM PAL 620478.A, specimen as preserved; B, forewing venation. Scale bar 2 mm.