Is Every Vein a Real Vein? Cross-Section of the Wing of Matsucoccus Pini (Insecta, Hemiptera, Coccoidea: Matsucoccidae)

Abstract

Wings of Matsucoccus pini males were studied. Using light and scanning electron microscopes, both sides of the wing membrane, dorsal and ventral, were examined. The presence of only one vein in the common stem was confirmed by the cross-section, namely the radius. The elements regarded as subcostal and medial veins were not confirmed as veins. On the dorsal side of the wings, a cluster of campaniform sensilla is shown for the first time in the family Matsucoccidae, through SEM, and two additional sensilla were found on the ventral side. There was a lack of alar setae, microtrichia as well as pterostigma. This is the second cross-section of the wing among scale insects. We propose the following nomenclature for the wings in the family Matsucoccidae: subcostal thickening (sct), radius (R), median fold (med) and anal fold (af).

Keywords: Matsucoccidae; archaeococcoids; cross-section; wing veins; wings.

Figure 1

Forewing of Matsucoccus pini under LM. R—Radius, sct—subcostal thickening, med—median fold, al—anal lobe, af—anal fold; black arrow—narrow fold of anal lobe to hold hamuli.

Figure 2

Wings of M. pini; (a) sculpture of the dorsal side of the wing membrane; (b) fold of the anal lobe. Scale bar (a) 50 μm; R—Radius. (b) 10 μm.

Figure 3

Cross-section of the wing of M. pini. Scale bar 100 μm, (a,b) median fold in black dotted circle.

Figure 4

Cross-section of the wing of M. pini. Scale bar 100 μm; (a,b) median fold in black dotted circle.

Figure 5

Cross-section of the wing of M. pini. Scale bar 100 μm; (a–c) median fold in black dotted circle.

Figure 6

Cross-section of the wing of M. pini. Scale bar 100 μm; (a,b) median fold in black dotted circle.

Figure 7

Campaniform sensilla on the wings: (a) dorsally; (b) ventrally; (c,d) location of the CS in white dotted circles. Scale bar (a,b) 5 μm and (c,d) 10 μm.