Tytthus pubescens (Henry, Thomas J. 2012)
| Notice: | This page is derived from the original publication listed below, whose author(s) should always be credited. Further contributors may edit and improve the content of this page and, consequently, need to be credited as well (see page history). Any assessment of factual correctness requires a careful review of the original article as well as of subsequent contributions.
If you are uncertain whether your planned contribution is correct or not, we suggest that you use the associated discussion page instead of editing the page directly. This page should be cited as follows (rationale):
Citation formats to copy and paste
BibTeX: @article{Henry2012ZooKeys220, RIS/ Endnote: TY - JOUR Wikipedia/ Citizendium: <ref name="Henry2012ZooKeys220">{{Citation See also the citation download page at the journal. |
Ordo: Hemiptera
Familia: Miridae
Genus: Tytthus
Name
Tytthus pubescens Knight – Wikispecies link – Pensoft Profile
- Tytthus pubescens Henry, Thomas J., 2012, ZooKeys 220: 61-64.
Diagnosis
Diagnosis. This species is distinguished by the fuscous to black head; brown to black pronotum, often entirely or with only the posterior angles or posterior half whitish to pale brown; the pale yellow to yellowish brown antennal segment I and black segments II -IV; the long, erect setae in both sexes on antennal segment II as long or longer than the diameter of the segment; the uniformly pale, translucent hemelytra; and pale brownish yellow legs. Males of this species are always macropterous (Fig. 38); both macropters (Fig. 39) and brachypters (Fig. 40) are known for females, but brachypters are most common. This Holoarctic species is superficially similar to another Holarctic species, Tytthus pygmaeus, in general color and size. Tytthus pubescens is readily distinguished by the pale antennal segment I, the long erect and semierect setae on antennal segments I and II, and the often pale humeral pronotal angles.
Description
Description. Macropterous male (n = 10) (Figs 38, 79, 80): Length to apex of hemelytron 2.59-3.01 mm, length to base of cuneus 1.98-2.37 mm, width across hemelytra 0.93-0.96 mm. Head: Length 0.30-0.32 mm, width across eyes 0.64-0.66 mm, interocular width 0.30-0.32 mm. Labium: Length 1.01-1.07 mm. Antenna: Se gment I length 0.35-0.38 mm, II 0.88-0.94 mm, III 0.62-0.66 mm, IV 0.56-0.58 mm. Pronotum: Length 0.35-0.40 mm, basal width 0.74-0.78 mm. Coloration: Head (Figs 81-83): Fuscous to black, with a small, yellow, interocular spot near inner margin of each eye; eyes reddish brown. Labium: Segments I-III pale yellow; segment IV brown. Antenna: Segment I pale yellow; segment II-IV fuscous to black. Pronotum: Uniformly fuscous to black, some specimens brown at posterior angles, others pale brown on posterior half, sometimes with dark brown invading darker anterior half. Mesoscutum and Scutellum: Fuscous to black. Hemelytra: Pale translucent yellow to whitish. Ostiolar evaporative area (Fig. 84): Fuscous to black. Ventral surface: Thorax and abdomen uniformly fuscous to black. Legs: Coxae pale yellow, the bases brown; femora, tibiae, tarsi, and claws (Fig. 86) uniformly pale yellow. Structure, texture, and vestiture: Head: Weakly shiny, impunctate; set with relatively long, erect and semierect setae on vertex and frons. Labium: Extending to apices of meso- or bases of metacoxae; segment I extending just past base of head to anterior margin of xyphyus before procoxae. Antenna: Segment I set with rather short, sparse, recumbent setae and two to four or more long, erect, subapical, bristlelike setae; segment II densely set with short, recumbent setae, intermixed with erect and semierect setae mostly subequal in length to diameter of segment. Pronotum: Nearly rectangular; anterior angles rounded; lateral margins straight, only slightly widening to posterior angles; posterior margin straight or only very slightly sinuate; set with relatively long, recumbent and semierect setae. Mesoscutum: Broadly exposed, even in brachypters; with a few scattered, semierect setae. Scutellum: weakly shiny, equilateral; set with relatively long, semierect setae. Hemelytron: Macropterous, subparallel; cuneus and membrane fully developed, extending beyond apex of abdomen; evenly set with recumbent setae. Male genitalia (Fig. 85): Left paramere (Fig. 171): Right arm broad, widened through middle, tapering to a fine point apically; left arm short, apically pointed. Right paramere (Fig. 172): Elongate oval. Endosoma (Fig. 173): Strongly C-shaped, apically blunt. Phallotheca (Fig. 174): Broad, apically acute. Macropterous female (n = 10) (Fig. 39): Length to apex of hemelytron 2.66-3.10 mm, length to base of cuneus 1.98-2.24 mm, width across hemelytra 1.06-1.15 mm. Head: Length 0.30-0.32 mm, width across eyes 0.64-0.67 mm, interocular width 0.32-0.34 mm. Labium: Length 1.12-1.15 mm. Antenna: Segment I length 0.29-0.30 mm, II 0.69-0.72 mm, III 0.51-0.54 mm, IV 0.48-0.51 mm. Pronotum: Length 0.35-0.38 mm, basal width 0.82-0.93 mm. Macropters have normally developed hemelytra that extend well beyond the apex of the abdomen as in males. Out of 63 females examined, only 10 are macropterous. Brachypterous female (n = 10) (Fig. 40): Length to apex of abdomen 2.34-2.66 mm, length to base of cuneus 2.05-2.11 mm, width across hemelytra 0.94-1.15 mm. Head: Length 0.32-0.34 mm, width 0.67-0.69 mm, interocular width 0.32-0.34 mm. Labium: Length 1.10-1.17 mm. Antenna: Segment I length 0.27-0.32 mm, II 0.75-0.80 mm, III 0.50-0.54 mm, IV 0.45-0.53 mm. Pronotum: Length 0.40-0.42 mm, basal width 0.75-0.83 mm. Brachypters are broadly rounded, with the cuneus sometimes slightly shortened and membrane greatly reduced and not attaining the apex of the abdomen.
Distribution
Distribution. This Holarctic species was previously known in North America from Alaska, Alberta, British Columbia, Colorado, Newfoundland, New Mexico, Quebec, Saskatchewan, and Yukon Territory (Henry and Wheeler 1988, Wheeler and Henry 1992, Polhemus 1994, Maw et al. 2000, Wheeler 2011). Arizona is a new state record. In the Old World, it is known in Asia from Russia (East Siberia, Far East, and West Siberia) and in northern Europe from Austria, Byelorussia, Czech Republic, Denmark, Estonia, Finland, France, Great Britain, Germany, Hungary, Ireland, Latvia, Luxembourg, Moldavia, The Netherlands, Norway, Poland, Russia (Central European and Northern European territories), Slovakia, Sweden (Wheeler and Henry 1992, Kerzhner and Josifov 1999).
Taxon Treatment
- Henry, Thomas J.; 2012: Revision of the Plant Bug Genus Tytthus (Hemiptera, Heteroptera, Miridae, Phylinae) ZooKeys, 220: 61-64. doi
This treatment was originally uploaded by Plazi, compare this treatment on Plazi. Unless this treatment has been substantially changed on Species-ID, Plazi requests to maintain a link back to the original repository.
