Eurema albula celata (R.Felder, 1869)

Eurema albula celata

( Fig. 4 B View FIGURE 4 , Figs. 5–6 D – F View FIGURE 5 View FIGURE 6 ). Chorion of 1287 µm long and 358 wide, 3.6 times longer than its maximum width at the equator ( Fig. 4 B View FIGURE 4 ), and approximate ratio w/l of 1/4 (h=10). Color N 00 A 10 M 00. Semifusiform—like an elongated ellipsoid—with a weak, slightly convex base and a thin but convex apex; the basal region is 1.5 times wider than the apical region ( Fig. 4 B View FIGURE 4 ). The micropyle is a very irregular trapezoid with at least four micropylar openings, surrounded by a rosette of four petals ( Fig. 5 D View FIGURE 5 ). This polygon is barely depressed with respect to the rosette, both with rounded vertices ( Fig. 5 D – E View FIGURE 5 ). The petals have a subtle anchorage with the central polygon and thinner lateral walls than the external ones—the closest area to the micropyle is the thinnest ( Fig. 5 D View FIGURE 5 – iii). The petals do not show texture and have conspicuous walls, while the foils show the opposite ( Fig. 5 D – E View FIGURE 5 ). The perimicropylar region exhibits an irregular wreath of 16 foils in a not well-defined semi-ring; all the foils have four to six irregular curved edges. The walls of the foils are incipient and do not protrude from the exochorion, with some of them recorded only as areas without texture ( Fig. 5 E View FIGURE 5 – iv). No transition zone is visible after the wreath ( Fig. 5 E – F View FIGURE 5 ); and it continues with apical polygons with aeropyles at their vertices and a conspicuous micro-grid ( Fig. 5 F – v View FIGURE 5 , Fig. 6 D View FIGURE 6 ). The aeropyles are semicircular and occur singly at the vertices of the polygons in a zigzag pattern ( Fig. 5 F View FIGURE 5 , Fig. 6 D View FIGURE 6 ). There are 6–8 aeropyles at vertices aligned in an apex-equator direction ( Fig. 5 F View FIGURE 5 ); the micro-grid is of 4–6 rounded polygons per macro-grid cell and has a subtle rough texture in its lumen ( Fig. 5 F View FIGURE 5 , Fig. 6 D View FIGURE 6 ). Towards the equator, 17–19 nearly straight axes are recorded in lateral view (34–39 in total), with fusions and bifurcations mainly at the poles ( Fig. 4 B View FIGURE 4 ). 65–72 ribs, mostly straight, with some diagonal ones throughout the exochorion ( Fig. 4 B View FIGURE 4 ). The axes and the diagonal ribs protrude slightly from the chorionic wall, whereas the straight ribs and micro-grid remain in the same visual plane ( Fig. 6 E View FIGURE 6 ). The ribs are slightly thicker than the micro-grid, so their differentiation is subtle with SEM, although slightly more conspicuous by staining ( Fig. 4 B View FIGURE 4 , Fig. 6 E View FIGURE 6 ). Almost all the macro-grid cells are irregular with four to six sides ( Fig. 4 B View FIGURE 4 , Fig. 6 E View FIGURE 6 ) and of the same size, although the apical polygons are narrower ( Fig. 4 B View FIGURE 4 ). The micro-grid is composed of six elliptical polygons per macro-grid cell ( Fig. 6 E View FIGURE 6 ), with a faint rough texture within the micro-grid polygons ( Fig. 6 E View FIGURE 6 ). Both grids maintain their thickness from pole to pole, which fades slightly towards the prebase ( Fig. 6 F View FIGURE 6 ), where it is only recorded as a texture with little relief. Basal aeropyles are not recorded ( Fig. 6 F View FIGURE 6 ). In the basal zone, the edges of the polygons and the texture are blurred and only scarce roughness is visible ( Fig. 6 F View FIGURE 6 ).

Eurema albula celata :

México: Veracruz: San Andrés Tuxtla, Estación de Biología Los Tuxtlas (18°35’05.64” N, 95°04’26.16” W), 148 msnm, 21-VI-2022, K. L. Pillado (ABD-2294); L. J. Vega (ABD-2295); no mature exochorion: A. Luis (ABD-2296), A. Arellano (ABD-2297) GoogleMaps .