Stenus stigmosus Puthz 2011, nov.sp.
Creators: name: Puthz, V
Publisher: name: Zenodo
Year: 2011
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Staphylinidae
Stenus
Stenus stigmosus

description: Stenus stigmosus nov.sp. (Figs 24, 85, 116)   
T y p e m a t e r i a l: Holotype () and 1, 1 - paratypes: TAIWAN: Nantou Hsien: Hwy 14 below Wushe, 900 m, 22.IV.1990, A. Smetana (T 16). Paratypes: 1: near Tsuifeng (2200 m), 19.VII.1976, Y. Shibata; 2: near Piluchi (2300 m), 3.VIII.1983, 27.III.1986, Y. Shibata; 1: Lushan Hot Springs, 31.VII.1971, Y. Shibata; 1: near Lushan (1200 m), 28.VII.1977, Y. Shibata; 1: near Chushan, 11.II.1977, J. C. Lien; Taoyuan Hsien: 2: Takuanshan Forest, 1600 m, 17.IV.1990, A. Smetana (T 3); 1: Taoyuan-Taipei Hsien: near Mt. Lalashan, 25.VII.1978, Y. Shibata; Ilan Hsien: 1: Chyr Duan, 1050 m, 18.IV.1990, A. Smetana (T 7); 3: Taipingshan, 1820 m, 15.VII.1993, A. Smetana (T 153); Hualien Hsien: 4: Taroko N. P., Nanhushi Hut, 2220 m, 8.V.1990, A. Smetana (T 48); 4: ibidem 2200 m, 11.V.1990, A. Smetana (T 53); 1: ibidem, 2220 m, 12.V.1990, A. Smetana (T 54); 1: Kwan Yuan, ca. 2200 m, leg. C. L. Li; Chiai Hsien: 3: Alishan (2300 m), 7.VIII.1970, 2.VIII.1973, 8.VIII.1974, Y. Shibata; 1: Fenchihu (1400 m), 6.VIII.1976, Y. Shibata; Kaohsiung Hsien: 1: Peinantashan trail, 2065 m, 6.VII.1993, A. Smetana (T 140); 1: Creek 2 km E Tien Chih, Hwy 20, 2400 m, 22.VII.1993, A. Smetana (T 161); 1: Near Tianchi (2200 m), 1.VIII.1976, Y. Shibata; Taitung Hsien: 1, 1: Hsinkangshan above Chengkung, 800 m, 27.IV.1995, A. Smetana (T 168)- HT and PTT in coll. A. Smetana (Ottawa), PTT also in the Museum für Naturkunde Berlin, in coll. Shibata and in cP.  
D e s c r i p t i o n: Macropterous, black, each elytron with a small orange spot in posterior middle, moderately shiny, forebody coarsely to very coarsely, very densely punctate, abdomen coarsely and densely (anteriorly), finely and moderately densely (posteriorly) punctate; pubescence short, recumbent. Antennae brown, club infuscate. Segment 1 of maxillary palpi yellow, segment 2 reddish yellow, segment 3 brownish. Paraglossae coniform. Legs reddish brown, knees infuscate. Clypeus black, labrum blackish brown, moderately densely pubescent.  
Length: 5.8-7.2 mm (forebody: 2.8-3.2 mm).  
PM of the Ht: HW: 50; DE: 25; PW: 36; PL: 39; EW: 53; EL: 58; SL: 47.  
M a l e: Legs simple. Metasternum broadly shallowed, coarsely and densely punctate, interstices on the average smaller than punctures. Anterior sternites simple, sternite 7 finely and densely punctate and pubescent in posterior middle. Sternite 8 apically with a moderately broad notch, about one tenth as long as the sternite. Sternite 9 serrate apicolaterally (fig.85). Tergite 10 broadly rounded. Aedeagus (fig.118), apical portion of median lobe short with a small apical tip, sclerotized expulsion clasp very narrow and short, internal sac broadly tubous; parameres much longer than median lobe, spoon shaped apically with about 17-21 strong setae.  
F e m a l e: Sternite 8 rounded at posterior margin, slightly roundly projecting in apical middle. Valvifer serrate apicolaterally. Tergite 10 broadly rounded. Spermatheca (fig. 24).  
Head slightly narrower than elytra, frons moderately broad with two deep longitudinal furrows, median portion slightly narrower than each of the side portions, moderately elevated, not extending to the level of dorsal eye margins; punctation coarse and very dense, punctures about as large as medial cross section of antennal segment 3, interstices much smaller than half diameter of punctures. Antennae slender, when reflexed extending to the posterior margin of the pronotum, penultimate segments twice as long as broad, segment 1 three times as long as broad. Pronotum a little longer than broad, broadest in about middle, sides convex anteriorly, distinctly concave posteriorly; a deep transverse impression laterally and a moderately narrow longitudinal furrow medially present; sculpture very coarse and rough, at parts slightly coalescent, punctures can become as large as apical cross section of antennal segment 2, interstices much smaller than half diameter of punctures, in the median impression sometimes as large as punctures. Elytra large, longer than broad, shoulders prominent, sides slightly convex, posterior margin moderately deeply emarginated; humeral, sutural and a posterolateral impression distinct; the slightly oval elytral spot is situated in the posterior middle, its distance from the suture is somewhat larger than its diameter, from the sides slightly smaller; punctuation very dense, almost slightly coarser than on the pronotum. Abdomen broad, paratergites horizontal, broad, densely punctate, those of tergite 4 about as broad as metatibiae at base, basal furrows of anterior tergites deep, tergite 7 with a broad membraneous fringe apically; anterior punctuation coarse and dense, on tergite 4 punctures are about as large as basal cross section of antennal segment 3, interstices much smaller; on tergite 7 punctures are about as large as one eye facet near dorsal eye margin, interstices distinctly larger than punctures; tergite 10 finely and sparsely punctate. Legs slender, metatarsi about ¾ as long as metatibiae, segment 1 slightly shorter than the three following segments combined, much longer than the last segment; segment 4 deeply bilobed. Reticulation of the forebody indistinct, that of the abdomen shallow but distinct.  
Variability: The punctation on tergite 4 may sometimes be sparser than described above.  
 C o m p a r a t i v e n o t e s: This new species belongs to the group of S. stigmaticus FAUVEL, which is characterized as follows: Moderately large to large species (4.0- 7.5 mm) with coniform paraglossae, antennae and legs slender, tarsal segment 4 deeply bilobed, abdomen with broad paratergites, sternum 9 serrate apicolaterally. Male: Legs without special sexual charaters. Aedeagus without or with small sclerotized expulsion mechanisms, parameres long, spoon shaped apically. Female: Spermatheca distinctly sclerotized with slender infundibulum. Sister group is the abdominalis- group with apicolaterally acute ninth sternum.   
 The following species belong to the stigmaticus -group: S. agostii PUTHZ, S. contrusus L. BENICK, S. divergens L. BENICK, S. obliquenotatus CAMERON, S. stigmatias PUTHZ, S. stigmaticus FAUVEL, S. stigmosus nov.sp. and S. stigmifer nov.sp. The group is distributed from Northern India, Nepal, Southern China to Sumatra, Java and the Philippines.- For identification amongst the Taiwanese species see key.   
 E t y m o l o g y:" stigmosus " (Lat.) = with stigmata.
description: Published as part of Puthz, V, 2011, On the Stenus LATREILLE 1797 from Taiwan with spotted elytra including remarks on the S. gestroi-group (Coleoptera, Staphylinidae) (316 Contribution to the Knowledge of Steninae), pp. 565-596 in Linzer biologische Beiträge 43 (1) on pages 583-585, DOI: 10.5281/zenodo.5324778