Orthonotus efei Çerçi & Koçak, 2024

Çerçi, Barış, Koçak, Özgür & Tezcan, Serdar, 2024, Review of the Heteroptera (Hemiptera) fauna of Turkey: perspectives for future research, European Journal of Taxonomy 937, pp. 1-127 : 41-43

Orthonotus efei Çerçi & Koçak sp. nov.

urn:lsid:zoobank.org:act:98BB3D7F-A570-49B8-9778-6C04AB8F46A3

Fig. 17

Diagnosis

Characterized by the combination of the following characters: dorsum covered with two types of adpressed pale setae, one long and simple, other short and scalelike, first and second antennal segments slightly thickened, second antennal segment of male yellow with small basal ring, anterior and middle femora yellow, posterior one dark brown except for pale apical fourth and the shape of the vesica.

DIfferentIal dIagnosIs

The genus Orthonotus Stephens, 1829 is characterized by sexual dimorphism, males almost always macropterous with parallel sided hemelytra and females brachypterous, head before eyes remarkably elongated, lateral margins of pronotum concave, tibial spines without basal spots and vesica U or S-shaped with diverse shapes of apical processes ( Wagner 1975; Matocq & Pluot-Sigwalt 2001). Matocq & Pluot-Sigwalt (2001) recognized four groups of species in this genus with regard to the shape of the apical process of vesica. The new species undoubtedly belongs to the group of species with vesical process of their type 1. Within this group, its vesical process is most similar to those of O. longiceps (Reuter, 1883) and O. graecus Rieger, 1985 ( Rieger 1985). Although similar, several significant differences separate the vesical process of the new species and these two species. Most noticeably, the width of the large apical process tapers down gradually along its entire length in both species whereas it tapers down abruptly at the middle in the new species. Moreover, the small vesical process below is closer to apex in these species but very remote in the new species. Apart from the differences in vesical structure, O. graecus differs from the new species by black second antennal segment of male and O. longiceps differs by the extensive pale coloration of hemelytra and smaller ocular index of male (1.5) ( Wagner 1975; Rieger 1985). Finally, both these species lack scalelike setae on dorsum. The slightly thickened pale second antennal segment of male is an important feature of the new species that allows its distinction from most of the West Palearctic species. Only three species have such pale colored second antennal segments in males: O. longiceps , O. luteocinctus (Kiritshenko, 1951) and O. syriacus (Puton, 1881) . However, all these species have slender second antennal segments and the latter two species have remarkably long first antennal segments which surpass the tip of clypeus by more than ⅔ of their lengths.

Etymology

We dedicate the name of this new species to Efe Koçak, son of the second author.

Material examined

Holotype TURKEY – Karaman Province • ♂; Ermenek ; 9 Jun. 2020; Ö. Koçak leg.; LEMT.

Description

Male

COLORATION. Dark reddish brown. Head unicolorous dark reddish brown. First antennal segment unicolorous black, second antennal segment pale yellow with a small black ring basally, third antennal segment unicolorous yellow, last antennal segments missing. Pronotum and scutellum unicolorous dark reddish brown. Corium completely and clavus largely reddish brown, only very apex of exocorium pale yellow, cuneus largely whitish, inner margin, including apex, red. Membrane dark colored, pale along the margin with cuneus, veins red. Posterior femur largely dark brown, apical fourth pale yellow, middle and anterior femora unicolorous pale yellow, tibiae and tarsi pale, tibial spines pale. Abdomen dark reddish brown.

VESTITURE. Dorsum covered with two types of adpressed pale setae, one long and simple, other shorter and scalelike. Antennae covered with short adpressed pale setae. Pronotum with one long and thick seta on each anterior corner.

STRUCTURE. Size 3.5 mm, 4.2× as long as width of posterior margin of pronotum. Head 0.83× as long as wide, 1.6× as long as high in lateral aspect, portion of head distal to eyes, as long as height of eyes, ocular index 2.0, clypeus narrow and distinctly protruding, rostrum reaching posterior coxae. First two antennal segments slightly thicker than third one, first antennal segment only very slightly surpassing apex of clypeus, 0.43× as long as diatone, second antennal segment 1.5× as long as diatone, 1.0× as long as width of posterior margin of pronotum, ratios of antennal segments 10:35:28:?. Pronotum strongly trapezoid, 0.5× as long as wide, posterior margin 3× as wide as anterior one, anterior corners rounded, posterior corners flat and broadly rounded, lateral margins slightly concave, posterior margin straight. Hemelytra parallel sided, surpassing abdomen. Legs short and slender.

GENITALIA. Left paramere as in Fig. 17D . Right paramere typical of the genus. Vesica robust, S-shaped, its body thick, apically with two processes, the more basal one resembles a small tooth with sharp tip, the more apical one with a straight and rectangular body in the basal half that abruptly tapers down at its distal half, to a flat and narrow blade-like process, additionally, two small, blunt and curved teeth on the upper margin of this transition zone ( Fig. 17B–C ).

Figures

Fig. 17. Orthonotus efei Çerçi & Koçak sp. nov, holotype, ♂ (LEMT). A. Dorsal view. B–C. Vesica from different views. D. Left paramere. Scale bar = 1 mm.