Euschistus (Mitripus) convergens

Matesco, Viviana C., Fürstenau, Brenda B. R. J., Bernardes, Jorge L. C., Schwertner, Cristiano F. & Grazia, Jocélia, 2009, Morphological features of the eggs of Pentatomidae (Hemiptera: Heteroptera) *, Zootaxa 1984, pp. 1-30 : 10

Euschistus (Mitripus) convergens , Euschistus (Mitripus) hansi , and Euschistus (Lycipta) picticornis

( Figs. 1 , 17–36 ; Tab. 2 )

Eggs barrel-shaped to spherical ( Figs. 17, 18, 24, 25 , 33 ); operculum circular, with variable convexity; usually convex ( Figs. 17, 24 ), flat in C. picticornis ( Fig. 33 ). Chorion surface spinose and translucent after hatching of nymphs. Before hatching, eggs milky-white in E. hansi and E. picticornis to yellow in E. convergens ( Fig. 1 ); red eyes and dark brown ruptor ovis become visible with the development of embryo. Aero-micropylar processes white, slightly clavated at apex ( Figs. 22 , 28 ), entirely tubular in E. picticornis ( Fig. 35 ).

In the SEM, eggs of Euschistus spp. studied show chorion surface spinose ( Figs. 17, 18, 24, 25 , 33 ), although it has been described as finely reticulated in E. hansi ( Martins & Campos 2006) . In areas where the egg is fixed to another in the egg mass or to the substratum, chorion is covered by an adhesive substance that prevents visualization of sculpture pattern ( Figs. 17, 24 , 33 ). In all areas of the egg, a great number of spines projects from the surface, uniformly distributed in the chorion of E. picticornis ( Figs. 34, 35 ), or laminate expansions form polygonal figures, with long and acute spines along those projections, of E. hansi and E. convergens ( Figs. 19, 20 , 26 ). In the E. hansi egg, spine-shaped projections with different lengths can emerge from the smooth chorion, composing nearly polygonal figures in some areas of chorion ( Fig. 27 ). Lateral walls near the aero-micropylar processes, and operculum with longer and numerous spines, almost always tied by fine sheets ( Figs. 21, 22 , 28, 35 ), or sometimes inserted by smaller spines as in E. hansi ( Figs. 29, 30 ). Limits of the operculum are not easily visualized in noneclosioned eggs ( Figs. 21 , 29 ). Aero-micropylar processes can be distinguished from chorionic spines for being longer and larger in diameter; the processes are tubular in E. picticornis ( Fig. 35 ) and slightly clavated at apex in the other two species ( Figs. 22 , 28, 29 ). Its apical portion bears a central hole; at the magnification used, aero-micropylar processes walls seem smooth, instead of spongy ( Figs. 23 , 31, 32, 36 ).

Figures

FIGURES 1–10. Eggs of Pentatomidae. Fig. 1. Fertile eggs of Euschistus (Mitripus) convergens in dorsal view. Ruptor ovis (arrow). Fig. 2. Fertile eggs of Chinavia erythrocnemis in dorsal view. Aero-micropylar process (arrow). Fig. 3. Eggs of Chinavia longicorialis in dorsal view. Fig. 4. Eggs of Chinavia pengue in dorsal view. Fig. 5. Eggs of Chinavia musiva in dorsal view. Fig. 6. Fertile eggs of C. musiva in dorsal view. Eye (arrow). Fig. 7. Eggs of Grazia tincta in dorsal view. Fig. 8. Egg of Odmalea basalis in dorsal view. Fig. 9. Eggs of O. basalis in lateral view. Fig. 10. Eggs of Thyanta humilis in dorsal view.

FIGURES 11–25. Eggs of Pentatomidae in SEM. Fig. 11. Egg of Edessa meditabunda in dorsal view. Fig. 12. Chorion of E. meditabunda egg, showing granulated pattern. Fig. 13. Detail of the chorion of E. meditabunda egg, with polymorphic granules (arrows). Fig. 14. Anterior pole of E. meditabunda egg. Fig. 15. Detail of an aero-micropylar process of E. meditabunda egg, appearing as a small tubercle slightly projecting. Fig. 16. Aero-micropylar process of E. meditabunda egg, in the shape of a stalk projection. Fig. 17. Egg of Euschistus (Mitripus) convergens in lateral view. Posterior pole with sheets of adhesive material (arrow). Fig. 18. Egg of E. convergens in dorsal view. Fig. 19. Spinose chorion in the lateral wall of E. convergens egg. Fig. 20. Detail of E. convergens chorion, with long and acute spines (arrow) in the vertex of polygonal figures. Fig. 21. Detail of the chorion of E. convergens egg in a dorsal view. Aero-micropylar process (arrow). Fig. 22. Detail of chorion sculpture in the operculum of E. convergens egg near the aero-micropylar processes. Fine sheets connecting the spines (asterisk). Fig. 23. Detail of an aero-micropylar process of E. convergens egg, with smooth surface. Central hole (arrow). Fig. 24. Egg of Euschistus (Mitripus) hansi in lateral view. Area of egg fixation to the substratum (arrow). Fig. 25. Egg of E. hansi in dorsal view. (amp—aero-micropylar processes; ap—anterior pole; el —eclosion line; lw—lateral wall; op—operculum).

FIGURES 26–40. Eggs of Pentatomidae in SEM. Fig. 26. Chorion of the lateral wall of E. hansi egg, with laminate expansions. Fig. 27. Detail of the chorion of E. hansi egg, with spine-shaped projections with different lengths. Fig. 28. Lateral wall of E. hansi egg, with spines tied by fine sheets (asterisk). Fig. 29. Lateral wall of E. hansi egg, with long spines inserted by smaller ones. Fig. 30. Anterior pole of E. hansi egg. Fig. 31. Aero-micropylar process of E. hansi egg, with a central hole (arrow). Fig. 32. Detail of an aero-micropylar process of E. hansi egg, with smooth walls. Fig. 33. Egg of Euschistus (Lycipta) picticornis in lateral view. Posterior pole covered by adhesive material (arrow). Fig. 34. Surface of the lateral wall of E. picticornis egg. Fig. 35. Detail of the lateral wall of E. picticornis egg, near the aero-micropylar processes. Spines tied by fine sheets (asterisk). Fig. 36. Detail of an aero-micropylar process of E. picticornis egg, with smooth walls. Fig. 37. Egg of Chinavia erythrocnemis in lateral view. Contact area with neighboring egg (arrow). Fig. 38. Egg of C. erythrocnemis in dorsal view. Fig. 39. Detail of the lateral wall of C. erythrocnemis egg. Polygonal cell (arrow). Fig. 40. Reticulated chorion of C. erythrocnemis egg in greater detail, showing polygonal cells. (amp—aeromicropylar processes; ap—anterior pole; op—operculum; pp—posterior pole).