Macropygium bifidum (Westwood, 1837)

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: 619

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Macropygium bifidum (Westwood, 1837)


Macropygium bifidum (Westwood, 1837)   , NEW COMBINATION

( Figs 2A–B View FIGURE 2 ; 4I–L View FIGURE 4 ; 5G–I, S–U View FIGURE 5 ; 6C View FIGURE 6 ; 7C View FIGURE 7 ; 10 View FIGURE 10 ; 12 View FIGURE 12 ; Table 1)

Pentatoma bifida Westwood, 1837   in Hope, 1837: 43 NEW SYNONYMY (removed from the synonymy with M. reticulare   ).

Type specimen ( Fig. 10 View FIGURE 10 ): Pentatoma bifida Westwood, 1837   , holotype female, collection site unknown ( OUMNH). Labels: TYPE HEM: 249 / PENTATOMA   / BIFIDA WESTOOD / HOPE DEPT. OXFORD // Macropygium   / reticulare / Fabr. // TYPE. / = = / WESTW. ( HOPE) / C. Hemipt. 1837 / Part I, page 43 / Distant, P.Z.S., / 1900, p. 807-825.

Distribution: Bolivia, Paraguay ( Fig. 12 View FIGURE 12 ).

Material examined: BOLIVIA, Santa Cruz, Saavedra , 27♀, 12♂, 1959 ( FSCA), [-17.25277777778 - 63.211466666667]   ; Santa Cruz, 2♂, 1960 ( FSCA); 1♀, 1973 ( DAR), [-17.8 -63.1666666667   ]. PARAGUAY, San Pedro, 1♂, 1989 ( JEE)   .

Diagnosis. Antennae five-segmented, first and second antennomeres subequal in length; conical projection of ventral rim of pygophore bifurcate at apex; lateral angles of valvifers VIII little projected, not attaining the imaginary line connecting the mesial thrichobotria of urosternite VII.

Male. Genitalia: conical projection of ventral rim of pygophore bifurcate at apex; posterolateral angles acute, medial projection of posterolateral angles directed dorsoposteriorly, attaining the level of the dorsal limit of segment X in lateral view; lateral projection of dorsal rim thin, spine like, dorsal to the posterolateral angle, and partially covering the medial projection; segment X slightly higher than wide in posterior view, and longer than wide in ventral view ( Fig. 4I–L View FIGURE 4 ); parameres short, apical projection short and truncate, covered by long setae; largest axis of head equals half the length of stem ( Fig. 5G–I View FIGURE 5 ); vesica without lateral projections; ductus seminis distalis slender, middle portion twisted ( Fig. 5S–U View FIGURE 5 ).

Female. Genitalia: Valvifers VIII longer than wide, lateral angles little projected, not covering all the basal portion of laterotergites IX, reaching the level of a line connecting the mesial thrichobotria of urosternite VII; lateral margins of valvifers VIII reaching the laterotergites VIII; laterotergites IX with mid-lateral depression ( Fig. 6C View FIGURE 6 ). Folds of valvulae IX with few villi, conical microsculptures conspicuous; thickening of vaginal intima translucent; ring sclerites half the diameter of orificium receptaculi, this almost the width of the vaginal intima ( Fig. 7C View FIGURE 7 ).

Comments. Macropygium bifidum   is known only from Bolivia ( Fig. 12 View FIGURE 12 ), with an overlapping distribution with M. reticulare   and M. spinolae   . The pygophore in M bifidum   is easily differentiated from M. reticulare   and M. spinolae   by the bifid apex of the conical projection in the ventral rim ( Fig. 4I View FIGURE 4 ), and by the slender segment X with subparallel lateral margins ( Fig. 4I, J View FIGURE 4 ). The conical projection and the segment X in M. graziae   ( Fig. 4M, N View FIGURE 4 ) are similar to M. bifidum   , but in M. graziae   the lateral projections of the dorsal rim are broad and placed apart from the posterolateral angles of the pygophore ( Fig. 4O View FIGURE 4 ), while spine-like and close to the posterolateral angles in M. bifidum   ( Fig. 4K View FIGURE 4 ). Female genital plates in M. bifidum   are similar to M. reticulare   and M. spinolae   , as discussed in the comments made to M. reticulare   . The valvifers VIII in M. bifidum   are narrower than M. spinolae   , not covering the limits between the laterotergites VIII and IX ( Fig. 6B, C View FIGURE 6 ). The valvifers VIII in M. bifidum   are relatively longer than M. reticulare   , surpassing posteriorly an imaginary line connecting the spiracles in laterotergtes VIII by at least twice the spiracle diameter ( Fig. 6C View FIGURE 6 ).


Florida State Collection of Arthropods, The Museum of Entomology


Plant Pathology Herbarium