Beaconiella pulchra Shcherbakov, 2021
publication ID |
https://doi.org/ 10.15298/rusentj.30.2.02 |
persistent identifier |
https://treatment.plazi.org/id/039887BB-E653-FFD7-B23B-91A070DFB9AF |
treatment provided by |
Felipe |
scientific name |
Beaconiella pulchra Shcherbakov |
status |
sp. nov. |
Beaconiella pulchra Shcherbakov View in CoL , sp.n.
Figs 1–4 View Figs 1–8 .
MATERIAL. Holotype: tegmen PIN 2785 View Materials / 3022(3073)±. Paratypes: tegmina PIN 2240 View Materials / 4643(4679)±, 2555/2360, 2368(2386)±, 2429, 2908, 2785/3387(3893)±, 3405; hindwing PIN 2555 View Materials /2320±;
Dzhailoucho (Madygen, northern area), Leilek District, Batken Region, SW Kyrgyzstan; Madygen Formation, Ladinian–Carnian.
DESCRIPTION. Tegmen 12.9–19.4 mm long, 6.7–9.1 mm wide (19.4 x 7.1 mm in holotype), variation exaggerat- ed by rock distortion; √LW 9.3–11.8 mm (x1.27). Interradial area about as wide as radial area. RP and MA forks distant from nodal line. Proximal MP section (along nodal line) feebly arched, distal MP section (from nodal line to fork) rather long, sigmoidal, straight or arched backwards, MP1 arched forwards. CuA branches sigmoidal, in middle part subparallel to posterior wing margin. RP, M and CuA altogether with 30–35 terminations. Tegmen fuscous, especially at base and anteriorly, with small pale streaks along costal margin, 2–3 larger markings in pterostigmal area, and pale spots at nodus, on M stem, before crossvein im, and at base of CuA branches. Not only the sequence of distal branching and the number of terminations of all main veins are variable (as is usual in polyneurous wings), but also the degree of Sc+ RA fusion (up to completely free Sc in paratypes 2555/2360, 2785/3405) and the structure of the apex of basal cell: M separating from R at or slightly beyond arculus (in smaller tegmina) or fused with CuA at a very short distance in place of arculus (in larger tegmina). Hindwing 17.4 mm long, 10.4 mm wide; RA, RP, M and CuA forked about same level .
COMPARISON. Similar to Beaconiella fennahi and B. multivenata , but in these latter the interradial area is much wider than the radial area, and the RP and MA forks are close to the nodal line. Distinct from incompletely known B. triassica in smaller size and structure of MP and CuA: in the latter species, the proximal MP section is deeper arched, the distal one is very short, and CuA branches converge with the posterior wing margin.
ETYMOLOGY. Latin pulcher (beautiful, lovely).
MP |
Mohonk Preserve, Inc. |
R |
Departamento de Geologia, Universidad de Chile |
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.