Brachycarenus tigrinus (Schilling, 1829)

Vilímová, Jitka & Rohanová, Markéta, 2010, The external morphology of eggs of three Rhopalidae species (Hemiptera: Heteroptera) with a review of the eggs of this family, Acta Entomologica Musei Nationalis Pragae 50 (1), pp. 75-95 : 79-81

Brachycarenus tigrinus (Schilling, 1829)

( Figs. 11–16 )

Egg is elongated, rounded, more slender than eggs of Ch. schillingi and R. maculatus . Dorsal side is slightly convex, wide, without attachment stalk. Lateral sides are only slightly sunken longitudinally. Ventral side is narrower than dorsal, merging continuously into lateral sides without any special structures, such as longitudinal ribs.

In hatching, the larva forces off the pseudoperculum at anterior egg pole. Pseudoperculum is almost circular, slightly flattened and separated from surrounding chorion by pale low ridge of different structure. Chorion of this ridge with only fine tubercles to almost smooth.

Chorion is dull, with distinct low rounded tubercles in regular arrangement, surface between tubercles smooth. Structure of pseudoperculum identical with egg body.

Two micropylar processes are in longitudinal egg axis, one is on pseudoperculum close to the anterior egg pole, the other on dorsal side close to pseudoperculum and anterior egg pole. Micropyle is shaped as simple bent conical channel with single apical opening, directed dorsoposteriad or ventroposteriad. Entire micropylar process is bent posteriorly and pressed to chorion, thus appearing as a small rounded tubercle.

Egg is green after oviposition, becoming dark green-brown.

Measurements (in mm): length 1.11 (1.10–1.14), width 0.37 (0.35–0.39).

Figures

Figs. 11–16. Eggs of Brachycarenus tigrinus (Schilling, 1829). 11 – empty egg with separated pseudoperculum, ventral view; 12 – empty egg with separated pseudoperculum, lateral view; 13 – detail of boundary-line between egg body and pseudoperculum, anterolateral view; 14 – detail of micropylar process, most exposed view; 15 – anterior pole of egg with one micropylar process visible, dorsal view; 16 – detail of chorion pattern with rounded elevated tubercles. Scale = 100 μm for Figs. 11, 12, 15; 50 μm for Fig. 13; 10 μm for Figs 14, 16. Letterings: m1, m2 – micropylar processes; p – pseudoperculum.