Pyropteron triannuliforme ( Freyer 1842 )

Bąkowski, Marek & Piątek, Wiktoria, 2020, Morphology of pupae of the Pyropteron (Synansphecia) triannuliforme-group (Lepidoptera: Sesiidae), Zootaxa 4786 (1), pp. 93-100 : 97-99

Pyropteron triannuliforme ( Freyer 1842)

5 exuviae– 2 males, 3 females ( Germany, Brandenburg, 1993–1994)

Length and width: 12–19 × 2.5–3.75 mm (average: 14.75 × 2.8 mm).

Area of head projection blade prolonged and fairly sharply pointed in dorsal view, its length is slightly longer than half of its width. Longitudinal ridge enlarged and elevated in middle. Frons less tapered caudally from its lateral angles in dorsal view. Frontal setae situated distinctly prior to level of lateral angles of frons in dorsal view (Fig. 4a). Plate of head projection blade, rounded and not distinctly curved in lateral view, dark margin narrow. Frons rises rather steeply from projection blade in lateral view. Lateral depression on head wide, deep and rounded ventrocaudally (Fig. 4b). Distance between clypeal setae C1 2 from 2–2.5 × greater than distance between C1 2 and Cl 1. Labrum truncated at end and with concave lateral sides (Fig. 4c). Cremaster elongated, relatively roundly, anal suture approximately equal in length to anal suture in female and male. Spines on the 10th abdominal segment robust, semicircular, their setae short (Fig. 4d). Spines of basal row on the 2nd abdominal segment tiny, but with distinguishable point. Spines of caudal row approximately 3 × smaller than those of basal row on the 3rd abdominal segment. The 4th abdominal segment bears 10–11 slender spines of basal row between setae D1.

Diagnosis. Spines of basal row on the 2nd abdominal segment tiny, but with distinguishable points, similar to Pyropteron meriaeforme . Distance between setae Cl 2 2–2.5 × greater than distance of C1 2 from Cl 1, in P. meriae- forme from 3–4 × greater.

Biology. Host plants– Rumex spp. (egg. Rumex acetosella L., R. acetosa L., R. crispus L., R. optusifolius L.).

Distribution. Southern, central and eastern Europe from southeastern France, Sicily and Italy to European Rus- sia, the Caucasus, Transcaucasia, Turkey, and Iran ( Špatenka et al. 1999).

FIG. 3. Morphology of Pyropteron meriaeforme pupa: a. Dorsal view of frons, b. Lateral view of frons, c. Labrum and vicinity, d. Abdominal end ventrally (male). Scale bar– 0.2 mm.

FIG. 4. Morphology of Pyropteron triannuliforme pupa: a. Dorsal view of frons, b. Lateral view of frons, c. Labrum and vicinity, d. Ventral abdominal end (male). Scale bar– 0.2 mm.