Euschistus (Euschistus) heros (Fabricius, 1798)

Matesco, Viviana Cauduro, Bianchi, Filipe Michels, Fürstenau, Brenda Bianca Rodrigues Jesse, Silva, Priscila Poock Da, Campos, Luiz Alexandre & Grazia, Jocelia, 2014, External egg structure of the Pentatomidae (Hemiptera: Heteroptera) and the search for characters with phylogenetic importance, Zootaxa 3768 (3), pp. 351-385 : 365

Euschistus (Euschistus) heros (Fabricius, 1798) , Euschistus (Lycipta) riograndensis Weiler & Grazia, 2011 , and Euschistus (Mitripus) paranticus Grazia, 1987

( Figs. 2, 3 , 31–42 ; Tab. 2 )

Eggs barrel-shaped; color prior to embryonic development light green (in E. heros ) or white (in E. riograndensis and E. paranticus ) ( Figs. 2, 3 ); operculum round, with variable convexity, usually slightly convex ( Figs. 2, 3 ), but conspicuously flatter in E. heros ; chorion translucent and spinose. The eclosion line is not evident under SM; the AMPs are circularly arranged in a row around the anterior pole, white, moderately long and filiform ( Figs. 2, 3 ).

The chorion surface of all species of Euschistus Dallas studied here is densely spinose under SEM. The interconnected spines form polygonal markings that are mostly triangular at the lateral wall ( Figs. 31 , 39 ). The spines display different sizes, being usually thicker and longer at the triangle vertices ( Figs. 33 , 37, 38 ). This pattern may be obscured by traces of adhesive material gluing adjacent eggs ( Fig. 39 ). The operculum is similarly sculptured, with interconnected spines forming triangles ( Figs. 32, 36 , 40 ). The spines are shorter at the center of the operculum, and polygonal markings are sometimes obliterated ( Fig. 36 ). The spines display different sizes and are interconnected by a short membrane at the periphery of the operculum ( Figs. 34 , 41 ). The eclosion line is not evident. The AMPs are tubular in E. riograndensis ( Fig. 38 ) and slightly clubbed in the two other species ( Figs. 33, 34 , 41 ). Their openings are circular and apical, and there are fine connector sheets among adjacent AMPs in E. heros ( Fig. 34 ). The surface of the AMPs is spongy under higher magnification ( Figs. 35 , 42 ).

Figures

FIGURES 1 – 12. Eggs of the Pentatomidae viewed with stereomicroscopy. Fig. 1. Podisus nigrispinus (Dallas), egg mass, anterior view. Fig. 2. Euschistus (Lycipta) riograndensis Weiler & Grazia, lateral view. Fig. 3. Euschistus (Mitripus) paranticus Grazia, lateral view. Figs. 4 and 5. Mormidea cornicollis Stål. Fig. 4. Newly laid eggs, anterior view. Fig. 5. Fertile eggs, anterior view. Fig. 6. Chinavia armigera (Stål), fertile eggs, anterior view. Fig. 7. Chinavia aseada (Rolston), lateral view. Fig. 8. Chinavia brasicola (Rolston), anterior view. Fig. 9. Chinavia runaspis (Dallas), anterior view. Fig. 10. Banasa induta Stål, lateral view. Fig. 11. Serdia apicicornis Stål, anterior view. Fig. 12. Thoreyella maracaja Bernardes, Schwertner & Grazia, lateral view. Scale bar = 1 mm.

FIGURES 25 – 36. Eggs of the Pentatomidae viewed with SEM. Fig. 25. Catulona pensa Rolston, detail of anterior pole, showing the AMP and the granulated area. Figs. 26 – 30. Dichelops (Diceraeus) furcatus (Fabricius). Fig. 26. Lateral view. Fig. 27. Anterior view. Fig. 28. Magnification of the lateral wall. Fig. 29. Magnification of anterior pole, showing the eclosion line and the AMP. Fig. 30. Detail of AMP. Figs. 31 – 35. Euschistus (Euschistus) heros (Fabricius). Fig. 31. Lateral view. Fig. 32. Anterior view. Fig. 33. Magnification of the lateral wall, showing the AMP. Fig. 34. Magnification of AMP, showing connector sheets (asterisks). Fig. 35. Detail of AMP surface. Fig. 36. Euschistus (Lycipta) riograndensis Weiler & Grazia, anterior view. Abbreviations: amp – aero-micropylar process, ec – eclosion line, ga – granulated area, lw – lateral wall.

FIGURES 37 – 48. Eggs of the Pentatomidae viewed with SEM. Figs. 37 and 38. Euschistus (Lycipta) riograndensis Weiler & Grazia. Fig. 37. Magnification of the lateral wall. Fig. 38. Detail of the lateral wall, showing the AMP. Figs. 39 – 42. Euschistus (Mitripus) paranticus Grazia. Fig. 39. Lateral view. Fig. 40. Anterior view. Fig. 41. Magnification of anterior pole, showing the AMP. Fig. 42. Detail of AMP. Figs. 43 – 46. Mormidea cornicollis Stål. Fig. 43. Lateral view. Fig. 44. Anterior view. Fig. 45. Magnification of anterior pole. Fig. 46. Detail of AMP. Figs. 47 and 48. Chinavia armigera (Stål). Fig 47. Lateral view. Fig. 48. Anterior view. Abbreviations: amp – aero-micropylar process, lw – lateral wall.