New light shed on Triadophlebiomorpha wing morphology and systematics (Insecta: Odonata) Author Béthoux, Olivier CR 2 P (CNRS, MNHN, Sorbonne Université), Muséum national d’Histoire naturelle, case postale 48, 57 rue Cuvier, F- 75231 Paris cedex 05 (France) obethoux @ mnhn. fr obethoux@mnhn.fr Author Anderson, John M. Evolutionary Studies Institute, Witwatersrand University, 1 Jan Smuts Ave., Braamfontein, Johannesburg 2000, South Africa jmanderson. gondwana @ gmail. com gondwana@gmail.com text Geodiversitas 2023 2023-09-28 45 17 479 496 https://sciencepress.mnhn.fr/sites/default/files/articles/pdf/g2023v45a17.pdf journal article 270324 10.5252/geodiversitas2023v45a17 96784ccf-a749-4494-bfb4-f514eea7e824 1638-9395 8399030 urn:lsid:zoobank.org:pub:EE7AA253-A023-4011-B7E1-5820F8118ED3 Nototriadophlebia pritykinae n. gen., n. sp. ( Figs 7-9 ) urn:lsid:zoobank.org:act: BB1717F8-0D90-41B5-9D88-68689FB9B410 HOLOTYPE . — Specimen BP /2/20950ab, adpression preserving four wings ( Anderson collection, Evolutionary Studies Institute , University of the Witwatersrand , Johannesburg , South Africa ; Figs 7 , 8 ). PARATYPE . — Specimen BP /2/20986ab, adpression preserving a single wing ( Anderson collection, Evolutionary Studies Institute , University of the Witwatersrand , Johannesburg , South Africa ; Fig. 9 ) . E ScP RA RP1 1 -rp 2 CuA ScP F RA RP1 1-rp2 FIG . 8. — Nototriadophlebia pritykinae n. gen., n. sp. , holotype, specimen BP/2/20950a: A , B , right forewing ( RFW ); A , drawing of venation, with tentative reconstruction of wing base; B , photograph, location as shown on Fig. 7 (dry-ethanol composite, light-mirrored, flipped horizontally); C , D , overlapping left forewing ( LFW ), right hind wing ( RHW ) and left hind wing ( LHW ; in blue ); C , drawing of venation; D , photograph, location as shown on Fig. 7 (dry-ethanol composite, fragments readjusted digitally); E , left forewing ( LFW ), drawing of venation isolated from C , with tentative reconstruction of the posterior area; F , right hind wing ( RHW ), drawing of venation isolated from C (large red arrow, CuP+AA stem). Scale bar: 10 mm. FIG . 9. — Nototriadophlebia pritykinae n. gen., n. sp. , paratype specimen, BP/2/20986b, left wing (large red arrows indicating the CuP+AA stem): A , B , overview; A , drawing of venation; B , photograph (light-mirrored); C , D , detail of cubito-anal area, location as indicated on B (large red arrows, CuP+AA stem); C , drawing of venation; D , photograph (light-mirrored). Scale bars: A, B, 10 mm; C, D, 2 mm. DIAGNOSIS . — Area between the anterior wing margin and RA (distal to the nodus) widening gradually to ª/5 of wing length, where it is as wide as the RA-RP1 area (most prominent in forewing); first I- in the RP3+4-MA area (i.e. RP3+4 pseudo-fork; large orange arrows on Fig. 8A, F ) arising before RP3+4 mid-length; CuP+AA stem splitting into CuA and CuP+AA (as opposed to Cu and AA; large red arrow on Figs 8F , 9A, C, D ); AA reaching the posterior wing margin basal to the end of ScP; between the endings of MA and AA, posterior wing margin comparatively straight. ETYMOLOGY . — The species epithet honours Lyudmila N. Pritykina, for her contribution to our knowledge of fossil Odonata , and of Triadophlebiomorpha in particular. TYPE LOCALITY AND STRATIGRAPHY . — Both holotype and paratype were collected at Birds River (locality code ‘Bir 111’; see Anderson & Anderson 1984 ), South Africa ; Molteno Formation; lower Carnian , Upper Triassic ( Anderson et al. 1998 ). GENERAL DESCRIPTION Fore- and hindwings subequal, very elongated, broadest at mid-length; wing length about 74 mm (as derived from holotype specimen; possibly down to 70 mm ), maximum width about 11.0 mm (possibly down to 10.2 mm ), width opposite nodus 7.1-7.6 mm ); petiole long (about 12.8 mm ) and narrow (width about 2.4 mm ); ScP reaching the anterior wing margin basal to the first third of wing length; distal to the nodus, area between anterior wing margin and RA broadening gradually, at its broadest opposite the end of Irp 1+2 -rp 3+4 ; structure of the nodus and origin of RP+MA, RP and MA unknown; RP1/ RP2 fork in a position more distal than that of the point of origin of the first I- in the RP3+4 area; Irp 1 -rp 2 weakly differentiated, zigzagging along RP1; occurrence of 3 I- (and I+ between them) forming RP2 posterior pseudo-branches in the distal part of the area between RP2 and Irp 1+2 -rp 3+4 ; RP3+4 with a marked angle opposite the origin of the first I- (between RP3+4 and MA; large orange arrows on Fig. 8A, F ); the two first I- in the area between RP3+4 and MA branched; in this area, total of about 8 I- reaching the posterior wing margin; MA simple, rectilinear, very close to RP3+ 4 in its basal third; marked inflexion of the posterior wing margin opposite the ending of MA; MP originating from MP +Cu+AA with a slight obliquity; branches of MP and CuA not clearly distinguishable (probable occurrence of a CuAprlg), CuA with 2 branches at least, and with a I- distally branched between its two (first posterior) branches; MP and CuA covering more than a quarter (less than a third) of the posterior wing margin length; Cu+AA splitting into CuA and CuP+AA, CuA diverging very obliquely; CuP rectilinear, with about 4-5 posterior branches and I+ between them; AA gently curved, reaching the posterior wing margin basal to the end of ScP. SPECIMEN DESCRIPTIONS Specimen BP/2/20950 ( Figs 7 ; 8 ) Adpression preserving four wings, with side BP/2/20950a preserving the right forewing (isolated) and left wings in ventral aspect, and right hindwing in dorsal aspect (the three latter largely overlapping); and its reverse side BP/2/20950b. Right forewing ( Figs 7 ; 8A, B ). Well preserved, with area basal to the nodus and small portion of apex missing; preserved length 55.6 mm , maximum width 10.7 mm , width opposite nodus about 7.6 mm . Left forewing ( Figs 7 ; 8 C-E). Only anterior-most area decipherable; preserved length 73.2 mm ; estimated total length about 74.2 mm . FIG . 10. — Detail of the cubito-anal area in Neritophlebia longa Pritykina,1981 , holotype, specimen PIN 2555/614, left wing (large red arrow, CuP+AA stem). Scale bar: 4 mm. Courtesy A. S. Felker. Right hindwing ( Figs 7 ; 8C, D, F ). Well preserved, with nodal area and part of apex missing, and venation in the petiole difficult to decipher; basal to the nodus, RP and MA not distinguishable from each other (assumed to closely overlap); cubito-anal area preserved, showing a CuP+AA stem. Left hindwing ( Figs 7 ; 8C, D ). Barely decipherable but for the posterior wing margin, with a sharp inflexion opposite the end of MA.