Stolleagrion foghnielseni Simonsen, Archibald & Ware, 2024

Simonsen, Sj., S. Brucearchibald, Na. Rasmussen, Él. Sylvestersen, Olsen, Kent & Ware, Jessica L., 2024, Stolleagrion foghnielseni (Odonata, Cephalozygoptera, Dysagrionidae) gen. et sp. nov.: a new odonatan from the PETM recovery phase of the earliest Ypresian Fur Formation, Denmark, Zootaxa 5415 (3), pp. 493-498 : 495-496

Stolleagrion foghnielseni Simonsen, Archibald & Ware , new species

Figures 1–2

urn:lsid:zoobank.org:act:C88668B8-9E60-478D-B63F-D394596C78F0

Material. Holotype wing FUM-M 14257a, b, part and counterpart: the part is almost complete, with few sections missing; collected by René L. Sylvestersen, January 2017, Fur Stolleklint; deposited in the Fur Museum.

Description. Holotype wing ( Figs 1–2 ). Length, 32.8 mm; arculus to distal end of pterostigma, 24.9 mm; nodus to distal end of pterostigma, 17.6 mm; arculus to base of pterostigma, 20.3 mm; nodus to base of pterostigma, 13.0 mm; maximum width, 6.6 mm. Pterostigma dark, elongate: 4.7 mm long, ca. 5.6 times longer than wide, subtends 7.5 cells. Membrane hyaline. Ax0, Ax1 poorly preserved but confidently present ( Fig. 2 ), Ax2 distinct, Ax0 appears not synsclerotised with wing base. Ax1 ca. 2/3 distance wing base to arculus; arculus aligned with Ax2. Quadrangle dysagrionoid in shape, i.e., not more rectangular as in Eodysagrioninae Rust, Petrulevičius & Nel (e.g. Rust et al. 2008, fig. 1). Fourteen crossveins preserved in postnodal space (basal quarter not well preserved), 16 in postsubnodal space to pterostigma, at least three pairs aligned. Brace vein present, very weakly angled. RA only well-preserved distad pterostigma, strongly curved there, C-RA space two cells wide. RP1 well preserved, strongly curved distad pterostigma, RA–RP1 space two cells wide near apex. IR1 well preserved, zigzagged origin six cells distad origin of RP2, RP1–IR1 space three cells wide at margin. RP2 origin five cells distad nodus, abnormally small first cell basad RP2 origin formed by Y-branch of RP2–IR2 crossvein, IR1–RP2 space three cells wide at margin. IR2 origin half cell basad subnodus, linear, slightly curving distally, RP2–IR2 space at least 10 cells wide at margin. RP3-4 origin ca. 2/3 the distance from arculus to subnodus, linear, slightly curving distally, IR2–RP3-4 space at least 10 cells wide at margin. MA linear, slightly curving distally, RP3-4–MA space 16 cells wide at margin. MP linear, slightly curving distally, basal 1/3 subparallel to MA, then curving away gently, terminating beyond mid-wing, MA–MP space basally one cell wide, 15 cells wide at margin. CuA linear, basal 4/5 subparallel to MP, then curving away to wing margin, terminates ca. mid-wing, 3rd MP-CuA cross vein slightly oblique, MP-CuA space two cells wide from ca. 2/3 its length, widening to 12 cells at wing margin. CuA-A space well preserved, broad, 4–5 cells wide.

Diagnosis. As for the genus.

Deposit and age. Striated concretion between ash layers -29 and -24, Fur Formation, Stolleklint, Fur, Denmark; earliest Ypresian.

Etymology. The specific epithet is an eponym formed from the middle and surnames of Ole Fogh Nielsen, a Danish amateur entomologist and paleontologist, whose work (especially his books) have inspired Danish natural historians for decades.

Figures

FIGURE 1. Stolleagrion foghnielseni n. sp. holotype wing (FUM-N-14257). A, photograph of the part; B, drawing from the part. See text for abbreviations. Scalebar is 5 mm.

FIGURE 2. Stolleagrion foghnielseni n. sp. holotype wing (FUM-N-14257). Detail of wing base showing Ax0 (red arrow). Scalebar is 0.5 mm.