Umbrageocoris Kobor , 2019

Kobor, Peter, 2022, A redefinition of Umbrageocoris with new species and new combinations (Heteroptera, Lygaeoidea, Geocoridae), Deutsche Entomologische Zeitschrift 69 (2), pp. 139-150 : 139

Genus Umbrageocoris Kobor, 2019

Type species.

Umbrageocoris kondorosyi Kóbor, 2019, by monotypy.

Redescription.

General habitus ovoid, moderately elongate. Integument shiny, with sparse, silvery pubescence at least on abdominal venter. Head pentagonal; compound eyes large, reniform, slightly stylate; posterior edge of compound eyes touching anterior edge of pronotum. Ocular sulcus complete but shallow, slightly visible. Integument of vertex impunctate, with a thin longitudinal furrow of various length, at least present on clypeus. Antenniferous tubercles minute, not visible in dorsal view. Antennomere I shortest, graniform; antennomere II longest, cylindrical; antennomeres III and IV subequal in length; antennomere III cylindrical, antennomere IV fusiform. Clypeus with margins subparallel and apex rounded, surpassing the mandibular plates. Bucculae pointed, surpassing mandibular plates; ventral margins converging, forming a Y- or cup-shaped labial trough which continues in a suture of variable length towards base of head (Figs 1 , 2 ). Labiomeres I-II conspicuously stouter than labiomeres III-IV; labiomere I not reaching anterior margin of propleurite, labiomere II shorter than labiomere III, apex of labiomere IV reaching or slightly surpassing metacoxae. Thorax. Pronotum trapeziform with anterior edges and margin broadly convex, lateral margin slightly constricted. Integument shiny, deeply punctate; punctation variably dense. Pronotal callosities and humeral angles at most moderately bulging. Scutellum elongate triangular, basal width less than length; variably punctate except at trifurcate carina. Trifurcate carina of scutellum complete or apically reduced. Apex of scutellum sharply pointed. Submacropterous, brachypterous and coleopterous wing morphs known. Submacropterous morph: hemelytron with margins of clavus converging apically, claval commissure reduced, indistinct; corium with lines of punctures along claval margin, Cu, and costal margin; punctation variably present between M-R and costal margin in the apical half of corium. M-R of corium branching in apical third. Exocorium mostly narrow, sometimes slightly flared in apical half. Membrane at most slightly surpassing apex of abdomen. Metathoracic wing with hamus partly reduced, level of reduction variable (Figs 3 , 4 ); intervannals present, basally fused. Thoracic pleurites and sternites with dense punctation except prosternal collar, supracoxal lobes and peritreme of metathoracic scent efferent apparatus. Prosternite with a narrow, but conspicuously bulging collar. Peritreme bulbous with dorsal flange protruding, sometimes indented; vestibular scar present, reaching metasternal venter; evaporatorium reduced to extreme surroundings of peritreme (Figs 5-10 ). Femora of prothoracic legs more incrassate than those of meso- and metathoracic legs. Legs covered with sparse, decumbent pubescence; fore femora with simple trichobothria in a single line, fore tibia with strong, dense setosity ventrally. Tarsomeres I and III of pro- and mesothoracic legs subequal in length, tarsomere II shortest. Tarsomere III of metathoracic leg conspicuously elongate, longer than combined lengths of tarsomeres I and II. Abdomen. Abdominal tergites III-V rugose medially; sutures of tergites 4/5 and 5/6 strongly curved medially; suture 4/5 elongate nearly reaching suture 5/6 (Fig. 15 ). Abdominal sternites with rugose spots subdorsally. Abdominal trichobothria on sterintes III-IV with simple bothrium bearing a single sensilla, situated submedially, very close to each other in triangular arrangement (Fig. 11 ); trichobothria on sternites V-VII are subdorsal, either simple bothrium or trichome with microtrichia bearing a single sensilla, arrangement as in Fig. 3B . Genitalia. Posterior opening of male pygophore with pointed, short lateral processes, situated dorsolaterally; paramere with trunk moderately stout and blade slender, evenly curved (Fig. 13 ); gonoporal process of aedeagus with 10 coils. Female ovipositor short, bisecting only abdominal sternite VII (Fig. 14 ).

Comparative notes.

Umbrageocoris displays a remarkable similarity to the Australian genus Stylogeocoris in general facies [studied species: S. biroi Montandon, 1913 (lectotype, HNHM) and S. elongatus (Distant, 1901) (lectotype and paralectotype, BMNH; non-types, PCPK). However, Umbrageocoris can be readily distinguished from the latter genus based on the combination of the following characters: integument of vertex smooth, dorsum of head with a single longitudinal furrow of various extent medially (it might be finely punctate and dorsum of head with arcuate grooves anteriad to ocelli in Stylogeocoris ); labial through Y- or cup-shaped (V-shaped in Stylogeocoris ); labiomere III longer than II (labiomeres II and III subequal in length in Stylogeocoris ); margins of clavus converging gradually towards apex, claval commissure absent (margins of clavus subparallel, claval commissure short but distinct in Stylogeocoris ); hamus of hemelytron partly reduced (complete in Stylogeocoris ); peritreme rounded, evaporatorium reduced to surroundings of peritreme (peritreme auricular, evaporatorium covering most of the metapleurite in Stylogeocoris ); sutures of abdominal tergites 4/5 elongate almost reaching margin of 5/6, apex of suture 5/6 obtuse (sutures of abdominal tergites 4/5 and 5/6 not elongate, apex rounded as in Fig. 15 ).

Umbrageocoris can be distinguished from representatives of genus Geocoris distributed in the region [studied species: G. ochropterus (Fieber, 1844) (lectotype, BMNH); G. willeyi Kirkaldy, 1905 (syntype, BMNH)] by the combination of following characters: head pentagonal, posterior edge of compound eyes touching anterior edges of pronotum (head lunulate, posterior edge of compound eyes encompassing anterior edges of pronotum in Geocoris ); pronotum trapeziform with lateral margins slightly constricted medially (semicircular, lateral margins mostly not constricted in Geocoris ); trifurcate carina of scutellum distinct, at most apically reduced (slightly distinct to completely reduced in Geocoris ); hamus of metathoracic wing at most partly reduced, intervannals present, fused basally (hamus completely reduced and intervannals absent in Geocoris ); apex of suture of abdominal tergites 5/6 obtuse (rounded in Geocoris sp., as in Fig. 18 ).

Umbrageocoris differs from representatives of Germalus [studied species: G. coloratus Distant, 1918 (syntype, BMNH); G. fuscovittatus Malipatil, 2013 (non-type, BMNH); G. victoriae Bergroth, 1895 (lectotype, BMNH)] by the following characters: ocular sulcus complete, but slightly visible (always well-defined in Germalus ); labial through Y- or cup-shaped (U- or V-shaped in Germalus ); labiomere III longer than II (labiomeres II and III subequal in length in Germalus ); margins of clavus converging gradually towards apex, claval commissure absent (margins of clavus subparallel, claval commissure well-developed, distinct in Germalus ); hamus of hemelytron partly reduced (complete in Germalus ); peritreme rounded, evaporatorium reduced to surroundings of peritreme (peritreme auricular with dorsal supportive process, evaporatorium covering metapleurite and posterior half of mesopleurite in Germalus ); sutures of abdominal tergites 4/5 and 5/6 elongated, suture 4/5 almost reaching margin of 5/6 (sutures of abdominal tergites 4/5 and 5/6 very short, strongly obtuse, as in Fig. 17 ).

Distribution.

Representatives of the genus are distributed in continental Indomalaya and in the Indo-Australian Archipelago, from Laos to Northeast Australia (Northern Territories, Queensland, New South Wales).

Figures

Figures 1 - 4. Exoskeletal characters of Umbrageocoris: 1 - 2. Labial trough (indicated by arrow) of U. kondorosyi (1) and U. malipatili sp. nov. (2), 3 - 4. Metathoracic wing (arrow indicates hamus) of U. kondorosyi (3) and U. elegantulus (4) (images not to scale).

Figures 5 - 10. Exoskeletal characters of Umbrageocoris: peritreme of metathoracic scent efferent apparatus of U. kondorosyi (5), U. maai maai (6), U. boonei sp. nov. (7), U. malipatili sp. nov. (8), U. elegantulus (9), and U. woodwardi (10) (images not to scale).

Figures 15 - 18. Sutures of abdominal tergites 4 / 5 and 5 / 6 in Umbrageocoris kondorosyi (15), Stylogeocoris elongatus (16), Germalus victoriae (17) and Geocoris (Geocoris) willeyi (18) (images not to scale).

Figures 11 - 14. Exoskeletal characters of Umbrageocoris: male pygophore with parameres in situ (11), female ovipositor in situ (12), arrangement of abdominal trichobothria on sternite IV (13) and sternites V-VII (14)