Scaphidium inimpressum Pic, 1920

Löbl, Ivan, 2025, On the identity of Scaphidium grande, with resurrection of S. inimpressum and S. melanopus and description of two new species (Coleoptera: Staphylinidae: Scaphidiinae), Acta Entomologica Musei Nationalis Pragae 65 (1), pp. 15-20 : 17

Scaphidium inimpressum Pic, 1920 , stat. nov. ( Figs 2 , 7 )

Scaphidium grande var. inimpressum Pic, 1920: 189 .

Type material. SYNTYPES: 3♀♀, labelled:ʻFormose Chaudoirʼ ( MNHN). One of them is designed as ʻTypeʼ [handwritten by Pic] and bears a handwritten identification label ʻv. inimpressum Picʼ.

Additional material examined. TAIWAN: Nantou Co., Renai To., 16.- 28.V.2018, leg.W.R. Liang by FIT, 1 J ( MHNG). Taichung City, Defulan Trail, Heping Distr., 24.1793, 120.9754, ca 850 m, 18.iv.2020, leg. F.S. Hu, on fungus, 1 J 2 ♀♀ ( TARI, MHNG). Hoozan [Hozan, Fongshan], iii.10, leg. H. Sauter, 2 JJ ( MHNG). Kosempo [Jiasian, Kaohsiung], 1.–5.vi. 1908, leg. H. Sauter, 3 JJ ( MHNG). Kosempo, 19.iv.1908, H. Sauter, 1 ♀ ( NMPC).

Diagnosis. Scaphidium inimpressum is in external characters very similar with S. grande . It may be distinguished by the coarser and dense punctation of the ventrite I and by the smaller body (length 5.70–6.55 mm, width 3.65–4.40 mm). It differs clearly in the shape of the aedeagus and the structure of the internal sac, as illustrated.

Distribution. Taiwan (revised data).

Figures

Figs 1–5. Aedeagi in Scaphidium grande group. 1 – S. grande Gestro, 1879 (Rumah Tuan Village, Sarawak); 2 – S. inimpressum Pic, 1920 (Defulan Trail, Taiwan); 3 – S. melanopus Achard, 1924 (lectotype); 4 – S. metafasciatum sp. nov. (holotype); 5 – S. grandior sp. nov. (holotype). Scale = 0.5 mm.

Figs 6–11. Internal sac of median lobe in Scaphidium grande group. 6 – S. grande Gestro, 1879 (Rumah Tuan Village, Sarawak); 7 – S. inimpressum Pic, 1920 (Defulan Trail, Taiwan); 8 – S. melanopus Achard, 1924 (lectotype); 9 – S. metafasciatum sp. nov. (holotype); 10 – S. grandior sp. nov. (holotype); 11 – Scaphidium sp. (Huisun, Taiwan).