Philhelius Stephens, 1841

Kim, Chan-Ouk, Chang, Gyu-Dong, Han, Ho-Yeon & Song, Jeong-Hun, 2025, Re-description, systematics and complete mitochondrial genome of Philhelius coreanus (Shiraki, 1930) (Diptera, Syrphidae) in the Republic of Korea, Biodiversity Data Journal 13, pp. e 146720-e 146720 : e146720-

Philhelius Stephens, 1841

Philhelius Stephens, 1841 Stephens (1841): 201. Type species: Syrphus ornatus Meigen, 1822 = Philhelius pedissequus Harris, 1788.

Xanthogramma Schiner, 1861 Schiner (1861): 318. Type species: Syrphus ornatus Meigen, 1822 = Philhelius pedissequus Harris, 1758. Synonymised by Evenhuis (2018): 51 –52.

Olbiosyrphus Mik, 1897 Mik (1897): 66. Type species: Syrphus laetus Fabricius, 1794. Synonymised by Vockeroth (1969): 90.

Syrphus ornatus Meigen, 1822

Diagnosis

The members of the genus Philhelius can be distinguished from other syrphid taxa by the following combination of characteristics [modified from Vockeroth (1969) and Thompson and Rotheray (1998)]: (1) postpronotum bare; (2) scutum predominantly black with distinct yellow lateral margins (Fig. 1 A); (3) scutellum with the anterior half black and posterior half yellow approximately (Fig. 1 A); (4) pleura predominantly black with yellow spots (Fig. 3 ); (5) dorsal and ventral katepisternal hair patches separated; (6) in male genitalia, postgonite relatively narrow and short, apico-dorsally with a long pointed upward hook (Fig. 4 C); and (7) hypandrial lingula absent (Fig. 4 C) and anteriorly with narrow concave corner in ventral view.

Figures

Figure 1. Philhelius coreanus, males. A, B body, dorsal and lateral view; C – F abdomen: dorsal view (C, D); ventral view (E, F); G – I head: frontal view (G); dorsal view (H); lateral view (I).

Figure 3. Thorax of Philhelius coreanus in lateral view, showing variation. A – C males; D – F females. Red arrows indicate areas with high variation.

Figure 4. Male genitalia of Philhelius coreanus. A lateral view; B caudal view; C hypandrium, lateral view; D phallus, lateral view; E, F basiphallus and distiphallus, lateral view, showing the general range of variation.