Styphlus (Styphlomimus) orthochaetinus ( Reitter, 1916 )

Legalov, Andrei A. & Reshetnikov, Sergei V., 2021, Redescription of Styphlus orthochaetinus (Reitter, 1916) from Siberia with new taxonomic data, Ecologica Montenegrina 40, pp. 118-124 : 119-122

Styphlus (Styphlomimus) orthochaetinus ( Reitter, 1916) , comb. and placem. nov.

Pseudostyphlus orthochaetinus Reitter, 1916: 197 .

( Figs. 1-3 )

Material: Holotype. Female ( HNHM), “ Altai ”, “Siberia, Altai ”, “ Pseudostyphlus orthochaetinus , mi, 1912, Fn. Germ. ”, “ Coll. Reitter ”, “ Holotypus, 1916, Pseudostyphlus orthochaetinus Reitter ”. Specimens : 1 male ( CSRN), 1 female ( CSRN), Russia, Altaiskii Krai , Charyshskii District, Korgon mountain range, 25 km SSW Vladimirovka, E of Antonov Korgon River, 1960 m a.s.l., alpine meadow, 50°51’56.9” N, 84°00’14.8” E, 3-4.VII. 2019, S.V. Reshetnikov.

Description

Body red-brown, covered with narrow decumbent light scales. Antennae and legs lighter. Even elytral interstriae with decumbent scales and odd interstriae with appressed scales.

Male. Rostrum equal in length to pronotum, subcylindrical, 3.5 times as long as wide, distinctly curved, with three longitudinal carinas, punctate. Antennal scrobes directed to base of rostrum, close located to lower edge of rostrum. Eyes quite large, coarsely-faceted, slightly convex, located towards bottom. Forehead flattened, punctuate, barely wider than width of rostrum basally. Temples slightly longer than eye. Vertex convex, densely punctate. Head widened behind eyes. Antennae inserted subbasally of rostrum. Scape long, 5.3 times as long as wide at apex, not reaching eye. Antennomeres 2-7 conical. Antennomere 2 about 2.0 times as long as wide in apex, 0.4 times as long as and 0.8 times as narrow as scape. Antennomere 3 1.2 times as long as wide in middle, 0.4 times as long as and 0.7 times as narrow as antennomere 2. Antennomere 4 equal in length and wide, 0.8 times as long as and slightly narrower than antennomere 3. Antennomere 5 0.9 times as long as wide, slightly shorter and wider than antennomere 4. Antennomere 6 0.8 times as long as wide, equal in length and slightly wider than antennomere 5. Antennomere 7 0.8 times as long as wide, 0.9 times as long as and 1.1 times as wide as antennomere 6. Antennomere 8 rounded, 0.7 times as long as wide, equal in length and 1.2 times as wide as antennomere 7. Antennal club compact, 2.1 times as long as wide in middle, 0.6 times as long as antennomeres 2-8 combined. Pronotum campanulate, 1.4 times as long as wide at apex, 1.1 times as long as wide in middle, 1.2 times as long as wide at base, with almost straight sides. Maximal wide before base. Disk convex, coarsely punctate. Distances between points much less diameter of points. Scutellum small, flat, semi-oval. Elytra 2.3 times as long as wide at base, 1.9 times as long as wide at middle, 3.1 times as long as wide at apical fourth, 2.5 times as long as pronotum. Humeri slightly flattened. Elytral striae distinct. Stria 9 long, not merging with stria 10 near level of metacoxa. Interstriae wide, weakly convex, 2.0-3.0 times as wide as elytral stria, finely punctate. Odd interstriae more convex. Prosternum punctate, without impression. Precoxal portion of prosternum slightly longer than length of procoxal cavity. Procoxal cavities contiguous. Postcoxal portion of prosternum two times shorter than length of procoxal cavity. Metanepisternum quite narrow, punctate. Metaventrite 1.7 times as long as length of metacoxal cavity, flattened, punctate. Abdomen flattened, densely punctate. Abdominal ventrite 1 1.2 times as long as metacoxal length. Ventrite 2 1.3 times as long as ventrite 1. Ventrites 1 and 2 weakly impressed in middle. Ventrite 3 0.5 times as long as ventrite 2. Ventrite 4 equal in length to ventrite 3. Ventrite 5 2.4 times as long as ventrite 4, without anal setae. Procoxae large, conical. Mesocoxae narrowly separated. Metacoxae transverse. Femora thickened, without tooth. Tibiae almost biconcave, with small uncus. Tarsi quite long. Tarsomere 1 conical. Tarsomere 2 wide-conical. Tarsomere 3 bilobed. Tarsomere 5 elongate. Claws free, without teeth. Length of body (without rostrum): 3.1 mm. Length of rostrum: 0.7 mm.

Female. Rostrum narrower, 3.9 times as long as wide as, slightly longer than pronotum. Antennae inserted in middle of rostrum. Pronotum wider, 1.2 times as long as wide at apex, slightly shorter than wide in middle, 1.1 times as long as wide at base. Elytra 1.9 times as long as wide at base, 1.7 times as long as wide at middle, 3.4 times as long as wide at apical fourth, 2.7 times as long as pronotum. Precoxal portion of prosternum 0.8 times as long as length of procoxal cavity. Postcoxal portion of prosternum two times shorter than length of procoxal cavity. Metaventrite 1.3 times as long as length of metacoxal cavity. Abdominal ventrite 1 0.8 times as long as metacoxal length. Ventrite 2 equal to ventrite 1. Ventrites 1 and 2 without impression in middle. Ventrite 3 0.5 times as long as ventrite 2. Ventrite 4 equal in length to ventrite 3. Ventrite 5 2.1 times as long as ventrite 4, without apical carina. Length of body (without rostrum): 4.4 mm. Length of rostrum: 0.8 mm.

Remarks: Placement of this species in the genus Styphlus is based on the seven-segmented antennal funicle, punctuate pronotum, subapical inserted antennae, second tarsomere bilobed, more convex odd interstriae of the elytra with decumbent scales, and odd interstriae with appressed scales. This species belongs to the subgenus Styphlomimus based on the forehead wider than width of the rostrum basally, distinct scutellum, and simple abdominal ventrite 5 in female.

Distribution: Western Siberia (type and present material) and probably South-Eastern Kazakhstan ( Davidian & Savitsky 2000) ( Fig. 4 ).

Figures

Figure 1. Styphlus (Styphlomimus) orthochaetinus: a - male, dorsally, b - male, ventrally, c - female, dorsally, d - female, ventrally. Scale bar for b and d = 1.0 mm.

Figure 2. Styphlus (Styphlomimus) orthochaetinus: a – male, laterally, b – aedeagus, dorsally, с – aedeagus, laterally, c – tegmen, dorsally, c – armament of endophallus, dorsally. Scale bar for 1 = 1.0 mm, for b-d = 0.5 mm, for e = 0.2 mm.

Figure 3. Styphlus (Styphlomimus) orthochaetinus, holotype.

Figure 4. Distribution of the subgenus Styphlomimus: black circle – S. oros, red circle – S. krueperi, triangular – S. medvedevi and S. mikhaili, ring – S. manueli, rhombus – S. caelebs, star – S. bogatshevi, square – S. armeniacus, octagon – S. orthochaetinus.