Eurema albula ceciliana

(Fig 4 A, Figs. 5–6 A – C). Chorion 1484 µm long and 376 wide; 4 times longer than the maximum width at the equator (Fig. 4 A), and approximate w/l ratio of 1/4 (h=20). Color N 00 A 10 M 00. Semifusiform but somewhat oblong, with convex base and apex; the basal region is almost twice as wide as the apical (Fig. 4 A). The micropyle, with no distinguishable micropylar openings, is depressed and very irregular pentagonal with curved vertices and edges. It is and surrounded by a rosette with not very pointed five petals (Fig. 5 A); all with thick external walls and with thinner lateral ones in those closer to the micropylar polygon (Fig. 5 A – i, B). The perimicropylar region has an irregular wreath with a defined semi-ring of 16 foils with slightly curved vertices and four to five irregular sides (Fig. 5 B). The lateral walls of the foils—although thick—are diffuse, mainly in those closer to the rosette (Fig. 5 B). The walls of petals and foils have almost the same thickness as the rest of the exochorionic grid (Fig. 5 A – C). The lumen of the foils closest to the apical polygons is the only one with a slightly rough texture (Fig. 5 B). After the wreath there is no transition zone (Fig. 5 B – C), but wide irregular quadrangular or pentagonal apical polygons with aeropyles at their vertices (Fig. 5 C, Fig. 6 A). A rough texture forms a micro-grid relief (Fig. 6 A – i) more conspicuous towards the equatorial third (Fig. 5 C – ii). The aeropyles are semicircular or elliptical (Fig. 5 C, Fig. 6 A) with an individual arrangement that concurs with the vertices of the polygons —confluence between axes and ribs (Fig. 5 C). There are 10–11 aeropyles at vertices aligned in an apex-equator direction (Fig. 5 C). Towards the equator, there are 22–23 almost straight axes in lateral view (40–43 in total), with fusions and bifurcations in any region of the chorion (Fig. 4 A); there are 61–72 ribs, mostly straight, with some diagonal ones throughout the exochorion (Fig. 4 A). The axes and the diagonal ribs protrude from the chorionic wall in great relief and are slightly thicker than the straight ribs and micro-grid, which remain in the same visual plane (Fig. 6 B). Since the ribs and the micro-grid are almost the same thickness, it is difficult to differentiate them by sight or by staining (Fig. 4 A, Fig. 6 B). The macro-grid is mostly quadrangular or irregularly rectangular (Fig. 6 B); almost all polygons are the same size, although the apical ones are narrower than the rest (Fig. 4 A). The micro-grid is composed of 4–6 rectangular polygons, but with gently curved vertices (Fig. 6 B). No texture is recorded in the lumen of the micro-grid (Fig. 6 B). Both grids maintain their thickness from pole to pole and become thinner towards the prebase, mainly the macro-grid (Fig. 6 C). In the prebasal area, the macro and micro-grid are blurred and the base shows only a slightly rough texture (Fig. 6 C). Basal aeropyles are not observed (Fig. 6 C).

Eurema albula ceciliana:

México: Oaxaca: Pluma Hidalgo, Finca Aurora-San Isidro (15°56’30” N, 96°29’13” W), 1170 msnm, 25-VIII-2008, J. Llorente (ABD-107); Candelaria Loxicha, El Azulillo (15°53’25” N, 96°29’27” W), 380 msnm, 03-VII-2011, J. Llorente (ABD-223, ABD-224) .