Macropygium graziae Silva & Campos, 2021

Silva, Layse Mitsue Harada Da & Campos, Luiz Alexandre, 2021, Revision of Macropygium Spinola, 1837 (Hemiptera: Pentatomidae: Ochlerini) with the revalidation of three species and the description of one new species, Zootaxa 4958 (1), pp. 605-627 : 622-626

Macropygium graziae Silva & Campos , sp. nov.

( Figs 2C–D ; 4M–P ; 5J–L, W–Y ; 6D ; 7D ; 13 ; Table 1 )

Holotype. Male. Labels: LA PAZ (Dep. San Javier) / Córdoba. / 1-20. I. 1929. C. Bruch ( MACN).

Paratypes. ARGENTINA, Buenos Aires, Buenos Aires, 1♀ [-34.599, -58.381] ( MACN) ; Córdoba, La Paz, 2♀, 1928 ( MACN) ; Corrientes, Alvear, 1♀, 1991 ( DAR) ; Entre Rios, 4♀, 1996 ( JEE) ; 1♀, 1991 ( DAR) ; BRAZIL, Santa Catarina, Urussanga , 2010 ( UFRG) [-28.499, -49.292] ; Rio Grande do Sul, Guaíba , 5♀, 1♂, 1974 [-30.113, -51.325] (1♀ MCNRS, 4♀, 1♂ UFRG); Taim, 2♀, 1982 ( UFRG) 1♀, 1985 ( MCN) [-32.538, -52.540]; Pelotas, 1♀, 2005 ( UFRG) [-31.624, -52.332] .

Etymology: the species is named in honor to Jocelia Grazia, for her friendship, guidance, and contributions to the taxonomy of Neotropical pentatomids; noun in apposition.

Distribution: Brazil, Argentina ( Fig. 13 ).

Diagnosis. Antennae four-segmented, length of the second antennomere equals the third and fourth antennomeres combined; lateral projection of dorsal rim of pygophore broad and apart from the posterolateral angle; middle portion of posterior margin of valvifers VIII projected over laterotergites IX, lateral angles not projected.

Male. Genitalia: conical projection of ventral rim of pygophore bifurcate at apex; posterolateral angles acute, medial projection of posterolateral angles broadly rounded and tumescent, almost attaining the dorsal limit of segment X in lateral view; lateral projection of dorsal rim large, subtriangular, apart from the posterolateral angle, and partially covering the medial projection in lateral view; segment X higher than wide in posterior view, and longer than wide in ventral view ( Fig. 4M–P ); parameres short, apical projection broad with a second apical process ( Fig. 5J–L ), largest axis of head less than half the length of stem; vesica without lateral projections; ductus seminis distalis thin, helicoidal in the middle portion ( Fig. 5W–Y ).

Female. Genitalia: Valvifers VIII partially covering the basal portion of laterotergites IX; middle portion of posterior margin of valvifers VIII projected over laterotergites IX, lateral angles not projected; laterotergites IX with mild lateral depression ( Fig. 6D ). Folds of valvulae IX occupying almost half the valvulae surface, with few villi, conical microsculptures barely visible; ring sclerites diameter equals the width of vaginal intima, weakly sclerotized and connected to the thickening of vagina intima, this weakly sclerotized; orificium receptaculi about 2/3 the width of vaginal intima ( Fig. 7D ).

Comments. Macropygium graziae occurs in southern Brazil and northern Argentina ( Fig. 13 ), partially overlapping with M. reticulare and M. spinolae . Macropygium graziae can be distinguished from all Macropygium species by the four-segmented antennae; by the lateral projections of the dorsal rim of pygophore broad and placed apart from the posterolateral angles of the pygophore ( Fig. 4O ); and by the middle portion of the posterior margin of valvifers VIII projected over laterotergites IX ( Fig. 6D ).

Figures

FIGURE 2. Dorsal view of Macropygium species (female and male, respectively). Macropygium bifidum (Westwood, 1837) (A–B); Macropygium graziae Silva & Campos, sp. nov. (C–D, paratype and holotype respectively).

FIGURE 4. Pygophore of Macropygium species, ventral, dorsal, lateral, and posterior view, respectively. Macropygium reticulare (Fabricius, 1803) (A–D); Macropygium spinolae Stål, 1860 (E–H); Macropygium bifidum (Westwood, 1837) (I–L), Macropygium graziae Silva & Campos, sp. nov. (M–P, holotype). Abbreviations: cp, conical projection; lp, lateral projections of dorsal rim; pl, posterolateral angles; ppla, medial projection of the posterolateral angle; par, paramere; X, segment X.

FIGURE 5. Paramere ventral, lateral, and dorsal view, respectively (A–L), and phallus dorsal, lateral, and ventral view, respectively (M–Y) of Macropygium species. Figure O is slightly slanted to the left to show the projection of phallotheca. Macropygium reticulare (Fabricius, 1803) (A–C, M–O); Macropygium spinolae Stål, 1860 (D–F, P–R); Macropygium bifidum (Westwood, 1837) (G–I, S–U); Macropygium graziae Silva & Campos, sp. nov. (J–L, W–Y). Abbreviations: ap, apical projection; ds, ductus seminis distalis; mp, medial projection; ph, phallotheca; pp, projection of phallotheca; sap, second apical projection; v, vesica.

FIGURE 6. Female genital plates of Macropygium species, ventroposterior view. Macropygium reticulare (Fabricius, 1803) (A); Macropygium spinolae Stål, 1860 (B); Macropygium bifidum (Westwood, 1837) (C); Macropygium graziae Silva & Campos, sp. nov. (D); Macropygium subsulcatum (Amyot & Serville, 1843) (E). Abbreviations: laIX, laterotergite IX; laVIII, laterotergite VIII; vfIX, valvifer IX; vfVIII, valvifer VIII; VII, urosternite VII; X, segment X.

FIGURE 7. Female internal genitalia of Macropygium species, ventral view. Macropygium reticulare (Fabricius, 1803) (A), Macropygium spinolae Stål, 1860 (B), Macropygium bifidum (Westwood, 1837) (C), Macropygium graziae Silva & Campos, sp. nov. (D). Abbreviations: cs, capsula seminalis; dr, ductus recptaculi; er, ring sclerites; id, internal duct of the vesicular area; laIX, laterotergite IX; md, median duct of the vesicular area; vaIX, valvulae IX; vfIX, valvifers IX; vi, vagina intima; pi, pars intermedialis; pr, processes of capsula seminalis.

FIGURE 13. Distribution map of Macropygium spinolae Stål, 1860, and Macropygium graziae Silva & Campos, sp. nov..