Geodromicus

Smetana, Aleš, 2016, New species and records of the genus Geodromicus Redtenbacher, 1857 (Coleoptera: Staphylinidae: Omaliinae) from Taiwan, Zootaxa 4066 (5), pp. 591-599 : 598

Key to the Geodromicus species of Taiwan

1 Species shorter than 5.0 mm. Elytra approximately as long as wide. Pronotum with wide and deep longitudinal depression. Apical antennomere without constriction................................................................... 2

- Species longer than 5.0 mm. Elytra distinctly wider than long. Pronotum with narrow longitudinal impression. Apical antennomere with well-defined constriction near base (see Hayashi 1992: Fig. 3 )........................................ 3

2 Head with postocular parts evidently wide and arcuate. Elytra shorter, slightly more than one half times longer than pronotum. Forebody black, abdomen dark brown. Habitus as in Fig. 1 . Larger, body length: 4.50–4.75 mm. Aedeagus wider, parameres exceeding apex of aedeagus ( Fig. 12 )..................................................... G. philydroides sp. n.

- Head with somewhat narrower postocular parts. Elytra longer, approximately twice as long as pronotum. Body reddish brown to brown, basal third of elytra bicoloured, yellow-brown to reddish-brown. Habitus as in Fig. 2 . Smaller, body length: 3.30– 4.60 mm. Aedeagus narrower, parameres almost reaching apex of aedeagus ( Fig. 14, 16 )............ G. taiwanensis sp. n.

3 Antennae shorter, reaching half length of elytra. Pronotum of male very large, wide and convex. Body length: 5.0– 6.2 mm. Aedeagus with narrow median lobe ( Hayashi 1992: Figs. 6–7 )............................ G. ohkurai ( Hayashi, 1992)

- Antennae slightly longer, exceeding half of elytra. Pronotum of male moderately small, narrow and less convex. Body length: 5.1–6.0 mm. Aedeagus with wide median lobe ( Hayashi 1992: Fig. 13 )................... G. formosanus ( Hayashi, 1992)

Figures

FIGURES 3 – 11. Abdominal segments (dorsal view) of Geodromicus philydroides sp. n. (3 − 5) and G. taiwanensis, sp. n. (6 − 11): 3, 6 — male abdominal tergite VIII, 4, 7 — male abdominal sternite VIII, 5, 8 — male genital segment, 9 — female abdominal tergite VIII, 10 — female abdominal sternite VIII, 11 — female genital segment. Scale bars: 0.1 mm.

FIGURES 1 – 2. Habitus of Geodromicus: 1 — G. philydroides sp. n., holotype, 2 — G. taiwanensis, sp. n., male, paratype. Scale bar: 1.0 mm.

FIGURES 12 – 13. Aedeagus of Geodromicus philydroides sp. n.: 12 — parameral view, 13 — lateral view. Scale bar: 0.1 mm.

FIGURES 14 – 16. Aedeagus of Geodromicus taiwanensis sp. n.: 14, 16 — parameral view, 15 — lateral view. Scale bar: 0.1 mm.