Stethusa spuriella (Gusarov, Vladimir I. 2003)
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Ordo: Coleoptera
Familia: Staphylinidae
Genus: Stethusa
Name
Stethusa spuriella Casey, 1910 – Wikispecies link – Pensoft Profile
- Stethusa spuriella Gusarov, Vladimir I., 2003, Zootaxa 239: 25-28.
Materials Examined
Type material.Lectotype of Atheta unigranosa (here designated): ɗ, "Newark, Del. [aware], 522.1905 [22.v. 1905]", " 7803 ", "Houghton", " unigranosa Bernh.Typus. Fenyes" (yellow label), "Chicago NHMus. M.Bernhauer Collection (FMNH). Lectotype of Atheta spuriella (here designated): ɗ, "N. Y. [New York, Catskill Mountains]", " spuriella Csy. ", " TYPE USNM39439 " (red label), " CASEY bequest 1925 " (NMNH). Lectotype of Atheta subdebilis (here designated): ɗ (with missing aedeagus), "MO: [Missouri, St. Louis]", " subdebilis Csy. ", " TYPE USNM39446 " (red label), " CASEY bequest 1925 " (NMNH). Paralectotype: Ψ, "MO: [Missouri, St.Louis]", " subdebilis PARATYPE USNM39446 " (red label), " CASEY bequest 1925 " (NMNH). Paratypes of Atheta macrops: UNITED STATES: Florida:2 ΨΨ, "Fla." (no locality data) (AMNH, FMNH); Jefferson Co.: Ψ, Monticello, 48.x. 1914 (AMNH). Additional material. UNITED STATES: Pennsylvania: Westmoreland Co.: ɗ, Jeannette (H.G.Klages) (FMNH); Ohio: ɗ, without locality data (Frost) (CASC); Indiana: Lawrence Co.: 2 ɗɗ (W.S.Blatchley), 29.vii. 1909 (CASC); Georgia: Rabun Co.: 2 ɗɗ, Clayton, 20003700 ' (Leng) (CASC).
Diagnosis
Diagnosis.Stethusa spuriella differs from S. dichroa in the following characters: a smaller body size; the lack of subbasal impressions of the terminal antennal article; the lack of the distal spines of the internal sac (Figs. 68; 3839); the shape of the spermatheca (Figs. 70; 4142); and the lack of a female accessory sclerite. Stethusa spuriella differs from S. klimschi in having a smaller body size; the bent apex of the median lobe (in lateral view; Figs. 6566; 5051); and a shorter spermatheca (Figs. 70; 57).
Description
Description. Length 2.12.5 mm. Head and abdomen dark brown, abdominal segments 34 and apical half of segment 7 lighter, pronotum brown, elytra brownish yellow, in some with darker area around scutellum, legs yellow, mouthparts and antennae brown, two basal antennal segments yellow. Head surface glossy, with weak isodiametric microsculpture, with fine punctation, distance between punctures equals 3 times their diameter. Eyes very large, 3.54.5 times as long as temples. Antennal article 2 is 1.1 times as long as article 3, articles 410 transverse, article 11 slightly longer than articles 9 and 10 combined. Pronotum transverse, 1.2 times as wide as head, width 0.460.57 mm, length 0.360.44 mm, width to length ratio 1.3; glossy, with very weak isodiametric microsculpture (hardly visible at 70 x); punctation as fine as on head but denser, distance between punctures equal to 12 times their diameter. Elytra much wider (0.590.73 mm) and longer (0.430.57 mm; measured from humeral angle) than pronotum (elytral length to pronotal length ratio 1.2), 1.3 times wider than long, surface glossy, with poorly visible (at 70 x) microsculpture; punctation as on pronotum, slightly asperate. Abdominal terga glossy, with weak microsculpture consisting of transverse waves; with fine punctation, distance between punctures equals 24 times their diameter on terga 35 and 36 times on terga 67. Apical margin of tergum 7 with white palisade fringe. Male tergum 7 with weak elongate medial tubercle in front of posterior margin. Posterior margin of male tergum 8 with two blunt medial projections and two lateral denticles (Figs. 58, 60). Aedeagus as in Figs. 6369, internal sac without distal spines (Fig. 68). Female without accessory sclerite. Spermatheca as in Fig. 70.
Discussion
Discussion. The three species synonymized here with S. spuriella are identical with the types of that species in external characters and the shape of the aedeagus. Distribution. Apparently, S. spuriella is widely distributed in the eastern United States but its distribution is poorly documented (Fig. 111). Natural History. No information is available.
Taxon Treatment
- Gusarov, Vladimir I.; 2003: A revision of the Nearctic species of the genus Stethusa Casey, 1910 (Coleoptera: Staphylinidae: Aleocharinae), Zootaxa 239: 25-28. doi
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