Hindwing much shorter than forewing, with anal area distinctly narrowed; 7.2 mm long, 2.3 mm wide.
The evolutionary innovation linked with the earliest splitting event in the Lower Permian is a shortening of the elytra, which then fit better with the shape of the abdomen [ 12], distinct modifications of the elytral venation [ 45], and a distinctly narrowed prosternal process [ 45].
Distinctly narrow rings seen in multiple samples are of particular interest because they indicate that a single factor limiting the growth of the trees — a drought, for instance — was in existence across the site.
Thus, the region of glass formation stretches from Z ≅ 2.00 (elemental Se) to Z ≅ 2.60 (As3Se2 glassy alloy) in As Se system [23 26], whereas it is distinctly narrower in As S system being in the range of ~2.05 < Z < (2.44 2.46) [23 26].
10 abdominal terga, with 1st and 2nd ones covered by tegmina; 8th and 9th terga distinctly narrow and separated from 10th and not covered by 7th.
7. Ratio of labrum to clypeus: (0) labrum strongly transverse, as wide as clypeus (ratio 1); (1) labrum distinctly narrower than clypeus (ratio less than 1).
Head capsule: slightly longer than wide, but appearing elongated; distinctly narrower anteriorly than at ocular region; distinctly prognathous; without macroscopic tubercles on dorsal surface; anterior margin shallowly concave; temples distinctly shorter than eyes, moderately projecting laterally.
Head medium sized, 1.8 mm long and 2.5 mm wide, about 1.4 times as wide as long; antenna slim with scape swollen, and pedicel distinctly narrower than scape, flagellum very thin.
The labrum of Amblomma, Brochocoleus, Pareuryomma, Odontomma, Cionocoleus and Lithocupes[ 3, 19] is distinctly narrower than the clypeus [ 3], whereas the labrum of Tetraphalerus and Permocupes is strongly transverse and as wide as the clypeus [ 12].
Considering QTL map locations in the BC as compared to the F6, there is a clear tendency for distinctly narrower QTLR in the F6 than in the BC; average QTLR extent in the F6 was just about half that in the BC, as anticipated from the observed map expansion in the F6.
Legs: procoxae nearly spherical, protruding, medially adjacent; protrochanter small, approximately triangular; profemur long, narrowing distally, with strongly convex posterior margin, distinctly thicker than protibia and slightly longer; protibia short, slender, slightly widening distally.
