Chorosomatini, Fieber, 1860

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 : 86

Chorosomatini

Our results confirm and provide a complete description of the Chorosoma schillingi egg (for published data, see Table 1). The egg of this species has been used as a ‘ type egg’ of the Rhopalidae (e.g. REUTER 1910; MICHALK 1935, as a ‘horizontal type of egg with stalk’, SOUTHWOOD 1956; PUTSHKOVA 1955, 1957), and as an egg with a dorsal stalk of attachment to the substrate. The egg of Ch. schillingi can be characterized by the chorionic stalk on dorsal side and two S-shaped micropylar processes with a short stem and broadened apex.

The egg of another chorosomatine, Myrmus miriformis (Fallén, 1807) , has been described in more detail (e.g. BUTLER 1923, MICHALK 1935, PUTSHKOVA 1955). The eggs of Ch. schillingi and M. miriformis are quite similar. The chorosomatine egg can be characterized as follows. Oval to bean-shaped, with conspicuously convex dorsal side. Chorion surface rough, of complicated pattern, formed from tetragonal, roughly rhomboidal convex elevations, pattern on egg body and on pseudoperculum slightly different. Border-line between egg body and pseudoperculum distinct ( Myrmus ) to much more distinct ( Chorosoma ). Two micropylar processes more conspicuous than in Rhopalini , opening pointed anteriorly, approximately Sshaped, helically bent at apex ( Chorosoma ) or lyre-shaped and toward one another ( Myrmus ). Periphery of egg rounded, without structures on lines between sides. Dorsal side with distinct chorionic attachment stalk approximately in middle. The stalk in Ch. schillingi that we describe in detail previously was referred to as a column ( MICHALK 1935) or leglet ( PUTSHKOVA 1957). The same structure was described in M. miriformis and Agraphopus viridis (Jakovlev, 1872) as a leglet ( PUTSHKOVA 1957).