Lineostethus otarus, 2018

Garbelotto, Thereza de Almeida, Kochenborger, Ana Paula Leite & Campos, Luiz Alexandre, 2018, Revision of Lineostethus (Heteroptera: Pentatomidae: Discocephalini), Zoologia (e 21232) 35, pp. 1-24 : 4-5

Key for males of Lineostethus Ruckes, 1966

1 Foliaceous expansions of dorsal rim of pygophore longer than wide, surpassing the posterior limit of ventral rim by at least one third of the expansion length ( Figs 62, 70: fdr)...........................................................................2

1’ Foliaceous expansions of dorsal rim of pygophore subequal in length and width or wider than long, sometimes surpassing the posterior limit of ventral rim but for much less than one third of the expansion length ( Figs 9, 19, 27, 37, 45, 54, 62, 70: fdr).............................. 3

2(1) Basal impression of the foliaceous expansions subrectilinear; proximal portion of the lateral margin of foliaceous expansions sinuous; apex of foliaceous expansions rounded; posterolateral angles usually hidden dorsally by the foliaceous expansions ( Figs 62–63: bi, dr, fdr, pa).......... ........ L. otarus Garbelotto & Kochenborger sp. nov. ( Fig. 7)

2’ Basal impression of the foliaceous expansions sinuous; proximal portion of the lateral margin of foliaceous expansions straight; apex of foliaceous expansions truncate; posterolateral angles visible dorsally ( Figs 70– 71: bi, dr, fdr, pa)................................................................ ..... L. auritus Garbelotto & Kochenborger sp. nov. ( Fig. 8)

3(1’) Foliaceous expansions of dorsal rim of pygophore subequal to posterolateral angles in dorsal view ( Figs 37, 54: fdr, pa) ....................................................................... 4

3’ Foliaceous expansions of dorsal rim of pygophore either longer or shorter than posterolateral angles in dorsal view ( Figs 9, 19, 27, 45: fdr, pa)............................................... 5

4(3) Basal impression of the foliaceous expansions clearly defined; cutting of dorsal rim subrectangular around the segment X; posterolateral angles of pygophore with acute apex ( Fig. 37: bi, fdr); projections of the superior layer of ventral rim with rounded apex ( Fig. 39: psl)..................... .................... L. graziae Hildebrand & Becker, 1982 ( Fig. 4)

4’ Basal impression of the foliaceous expansions less defined; cutting of dorsal rim U-shaped around the segment X; posterolateral angles of pygophore with rounded apex ( Fig. 54: bi, fdr); projections of the superior layer of ventral rim with hook-shaped apex ( Fig. 56: psl).............. L. acuminatus Kochenborger & Garbelotto sp. nov. ( Fig. 6)

5(3’) Foliaceous expansions of dorsal rim shorter than both the posterior limit of ventral rim and the posterolateral angles ( Fig. 9: fdr, pa); posterior limit of ventral rim subrectilinear ( Fig. 10)...... L. clypeatus ( Stål, 1862) ( Fig. 1)

5’ Foliaceous expansions of dorsal rim at least as long as both the posterior limit of ventral rim and the posterolateral angles, hiding or not the posterolateral angles in dorsal view ( Figs 19, 27, 45: fdr, pa); posterior limit of ventral rim sinuous ( Figs 20, 28, 46)........................................... 6

6(5’) Foliaceous expansions of dorsal rim subquadrangular and expanded, hiding the posterolateral angles dorsally; cutting of dorsal rim subrectangular around the segment X ( Fig. 19: fdr, pa, dr); margin of inferior layer of ventral rim with two lines of short bristles ( Fig. 20: b).................. ................................ L. tenebricornis ( Ruckes, 1957) ( Fig. 2)

6’ Foliaceous expansions of dorsal rim subrectangular and not expanded, leaving the posterolateral angles visible dorsally; cutting of dorsal rim U-shaped around the segment X ( Figs 27, 45: fdr, pa, dr); margin of inferior layer of ventral rim with one line of short bristles ( Figs 28, 46: b).......................................................................... 7

7(6’) Foliaceous expansions of dorsal rim longer than both the posterior limit of ventral rim and the posterolateral angles ( Fig. 45: fdr); apex of the projections of the superior layer of ventral rim spatulate ( Fig. 47: psl) ................................. ... L. sinuosus Kochenborger & Garbelotto sp. nov. ( Fig. 5)

7’ Foliaceous expansions of dorsal rim at maximum as long as both the posterior limit of ventral rim and the posterolateral angles ( Fig. 27: fdr); apex of the projections of the superior layer of ventral rim acute ( Fig. 28: psl) ..... ....................................... L. marginellus ( Stål, 1872) ( Fig. 3)