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–BView FIGURE 2; 4I–LView FIGURE 4; 5G–I, S–UView FIGURE 5; 6CView FIGURE 6; 7CView FIGURE 7; 10View FIGURE 10; 12View FIGURE 12; Table 1)

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

Type specimen ( Fig. 10View 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. 12View 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–LView 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–IView FIGURE 5); vesica without lateral projections; ductus seminis distalis slender, middle portion twisted ( Fig. 5S–UView 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. 6CView 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. 7CView FIGURE 7).

Comments. Macropygium bifidum  is known only from Bolivia ( Fig. 12View 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. 4IView FIGURE 4), and by the slender segment X with subparallel lateral margins ( Fig. 4I, JView FIGURE 4). The conical projection and the segment X in M. graziae  ( Fig. 4M, NView 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. 4OView FIGURE 4), while spine-like and close to the posterolateral angles in M. bifidum  ( Fig. 4KView 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, CView 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. 6CView FIGURE 6).


Florida State Collection of Arthropods, The Museum of Entomology


Plant Pathology Herbarium