Scaphisoma sambangsanense

Kim, Ye-Jun & Ahn, Kee-Jeong, 2023, Descriptions of Two New Species of Scaphisoma Leach (Coleoptera: Staphylinidae: Scaphidiinae) in Korea, The Coleopterists Bulletin 77 (4), pp. 537-541 : 538-540

Scaphisoma sambangsanense

Kim and Ahn, new species zoobank.org/ urn:lsid:zoobank.org:act:06D37D56-F153-4830-AD7B-837623301AA9 ( Figs. 2 , 7, 9 )

Type Specimens. Holotype: ♂, labelled as follows: “ KOREA, Gangwon Prov., Pyeongchang-gun, Cheongdong-ri, Mt. Sambangsan , FIT in Pinus

2) S. sambangsanense , new species, 1.65 mm; 3) S. limbatum , 2.3 mm.

Forest, 13 VII–15 VIII 2001, K.- J. Ahn, S.- J. Park, C.- W. Shin; HOLOTYPE Scaphisoma sambangsanense ”. Deposited in CNUIC . Paratypes: 4 exx., same data as holotype .

Description. Body length 1.6–1.7 mm, width 0.9–1.0 mm. Head dark blackish brown, antenna yellowish brown, pronotum dark blackish brown, elytra dark blackish brown with dark brown spot near apical and basal region, darkened along apical margin, pygidium dark reddish brown, meso- and metaventrites dark blackish brown, abdominal sternites dark brown, apex of each sternite lighter, legs reddish brown but tarsi yellowish brown. Measurement of holotype. Body 1.7 mm in length; head 0.4 mm in length (from anterior margin of labrum to the base), 0.6 mm in width; pronotum 0.7 mm in length, 0.8 mm in width; elytron 1.0 mm in length, 0.45 mm in width. Head. Finely and densely punctate; relative ratio of antennomeres 3 to 11 (4:6:10:13:13:13:14:13:14), antennomeres 7–11 expanded ( Fig. 9 ). Thorax. Pronotum about 1.4 times as wide as long, widest near posterior margin; finely and densely punctate. Scutellum small and con- cealed in dorsal view. Elytra widest at basal one-fourth, narrowest at apical margin, finely and densely punctate, punctation slightly more distinct than that of pronotum; sutural line distinct, gradually narrowed near apical margin. Hypomeron without punctures or setae. Mesoventrite smooth, with fine, dense punctures; submesocoxal area narrow, 0.03 mm long. Metaventrite punctation similar to that of mesoventrite; submetacoxal area narrow, 0.07 mm long, slightly widened near lateral margin, widened significantly halfway to submetacoxal margin, as long as one-third length of abdominal sternite III. Legs. Protibia, mesotibia, and metatibia straight.

Abdomen. Pygidium very finely and sparsely punctate.Abdominal sternites with fine punctures. Male. Setae on front tarsus more abundant than on female. Aedeagus 0.53 mm in length (from the base of median lobe to apex of paramere), width 0.19 mm in dorsal view, basal bulb oval and symmetrical, median lobe wide, gradually curved apically in lateral view; paramere expanded toward basal region; internal sac slightly curved to right side in dorsal view; curved at basal end in lateral view ( Fig. 7 ).

Distribution. Korea.

Etymology. Named after the type locality, Mt. Sambangsan.

Remarks. The new species is similar to Scaphisoma haemorrhoidale Reitter , possessing elytra with a dark brown line in the apical one-third and body length around 1.7 mm. However, they can be distinguished by the combination of the following characters: elytra with dark brown spots and the different form and structure of the aedeagus. Structures of the internal sac allow sep- aration from other species in the S. haemorrhoidale group, especially by the internal sac curved in dorsal view.

Figures

Figs. 1–3. Habitus, left in dorsal view and right in lateral view. 1) Scaphisoma koreanum, new species, 2.0 mm;

Figs. 4–10. Male genitalia (4–7) and antennomeres 3–11 (8–10). Scaphisoma koreanum, new species: 4) Dorsal view (left) and lateral view (right); 5) Paramere, ventral view; 6) Internal sac, dorsal view (left) and lateral view (right). 7) S. sambangsanense, new species, dorsal view (left) and lateral view (right). 8) S. koreanum, new species; 9) S. sambangsanense, new species; 10) S. limbatum. Scale bars = 0.1 mm.