Goriresina, Matalin & Perkovsky & Vasilenko, 2021

Matalin, Andrey V., Perkovsky, Evgeny E. & Vasilenko, Dmitry V., 2021, First record of tiger beetles (Coleoptera, Cicindelidae) from Rovno amber, with the description of a new genus and species, Zootaxa 5016 (2), pp. 243-256 : 245-249

Goriresina , new genus

( Figs 3–17 )

Type species. Goriresina fungifora , new species

Description. TL = 10.7 mm in the holotype.

Head with large, protruding, hemispherical eyes (right eye damaged by an Ophiocordyceps sp. synnema); left posterior and right anterior supra-orbital setae, as well as left clypeal seta clearly visible, while right posterior and left anterior supra-orbital, as well as right clypeal setae could not be found ( Figs 5 , 8 ); orbital plates and lateral portions of frons with at least four longitudinal furrows ( Fig. 4 ). Labrum most likely pale, relatively long, moderately convex, covering the mandibles to 4/5 of their length, dilated in the base with straight lateral margins, six submarginal setae (latero-basal setae very long), and two apical teeth with notch between them ( Figs 5, 6 , 8–10 ). Antennae filiform, apparently extending behind shoulders, scape with a single long apical seta ( Figs 3 , 5 ), pedicel glabrous, 3 rd antennomere the longest. Maxillary palpus with well-visible palpomeres 2–4; 2 nd palpomere slightly fusiform, with five visible stout setae; 3 rd palpomere with three visible stout setae; 4 th palpomere flattened, asetose, with a dilated and truncate apex; cardo and stipes each with two visible, long and stout setae ( Figs 5, 7 ). Labial palpus with distinctly visible palpomeres 2–4, 3 rd palpomere with at least 18 long stout setae along anterior margin and four setae (one apical, one medial and two basal) along posterior margin, 4 th palpomere asetose, elongate and drop-shaped ( Figs 5, 7 ).

Pronotum with well-developed apical and basal lobes, deep anterior and posterior grooves and a smooth virtually globular disc ( Figs 3 , 5 ), anterior margin of apical lobe and posterior margin of basal lobe narrowly bordered ( Fig. 4 ). Right metepisternum and metepimeron, as well as visible portions of abdominal sternites without setae; metepisternum approximately 2.8 times longer than wide ( Fig. 14 ).

Elytra elongate, converging to the apex, indistinctly dilated in basal third, moderately convex, with rounded obtuse-angulated shoulders, narrowly bordered from shoulders to suture; humeral area with dense punctuation and sparse thin setae, as well as a short groove between shoulder and an indistinct basal hump ( Fig. 12 ); scutellum small; each elytron clearly narrowing in apical portion and angularly, but smoothly rounded to the suture; sutural spine small and sharp; epipleura narrow ( Figs 3, 4 , 11, 13 , 17 ).

Legs long and slender ( Fig. 15 ), fore- and mesotrochanters each with a single long seta ( Fig. 5 ); profemora 1.19 times longer than protibia, meso- and metafemora virtually as long as meso and metatibia, respectively; all tarsomeres with two parallel rows of short stout setae on bottom surface and two rows of thin setae on upper surface; 1 st tarsomere the longest; 4 th tarsomere the shortest, with a group of long apical setae on bottom surface; 5 th tarsomere inserted towards upper apical side of 4 th one; claws paired, equal in length ( Fig. 16 ).

Posterior margin of last abdominal sternite with at least 30 clearly visible setae.

Etymology. The name is composed of the first part from Ukrainian hydronym “ ГОРинь ” (tributary of Pripyat River) as the main regional river and the name of the subtribe Iresiina .

Diagnosis. The glabrous head with two clypeal and four supra-orbital setae, the labrum with six submarginal setae, the glabrous and globular pronotum, the lack of setae from the metepisternum and metepimeron, as well as from the visible portions of abdominal sternites are combined the main reasons for considering the fossil as a new genus in the subtribe Iresiina Rivalier, 1971 . At present, nine extant ( Iresia Dejean, 1831 , Langea Horn, 1901 , Euprosopus Dejean, 1825 , Eucallia Guérin-Méneville, 1844 , Rhytidophaena Bates 1891 , Pronyssiformia Horn, 1929 , Distipsidera Westwood, 1837 , Nickerlea Horn, 1899 , Rhysopleura Sloane, 1906 ) and two extinct genera ( Palaeopronyssiformia and Palaeoiresina ) are considered as members of this subtribe ( Wiesner 2020).

Among them, by the shape of the labrum, by the elytral pattern and by the 5 th tarsomere being inserted towards the upper apical side of the 4 th one, the new genus resembles some species of Distipsidera . However, all extant Distipsidera species are characterised by a very broad preapical labial palpomere, by the apical setae starting directly from the anterior labial margin, by a deep horseshoe-shaped groove on the metepisternum, and by the punctateundulate elytral sculpture. Thus, these features make these two genera reliably distinguished from each other.

From Nickerlea , the new genus differs by the thin preapical labial palpomere, the submarginal apical setae of the labrum, the 5 th tarsomere inserted towards the upper apical side of the 4 th one, as well as by the elytral pattern.

From Rhysopleura , the new genus is easily distinct by the globular, not hump-shaped (in lateral view) pronotum, the very much shorter preapical labial palpomere, the apical setae starting in the submarginal area of the labrum, the smooth basal third of the elytra, the angularly rounded elytral apex with small sharp sutural spine, and the elytral pattern.

Euprosopus clearly differs from the new genus by the very long, narrow and parallel-sided elytra, as well as the elytral sculpture.

Langea , unlike the new genus, is characterised by the rough elytral sculpture and the smoothly rounded elytral apex.

The monotypic Eucallia is reliably distinguished by the very short labrum, the deep and rugose elytral sculpture and narrow apices of each elytron without sutural spine, both latter never convergent together.

Iresia , in contrast to the new genus, shows a very long and thin apical joint, and the preapical joint of the labial palpomere slightly curved along the posterior margin, a stripe-shaped impression along the bottom margin of the metepisternum, as well as the elytra with punctate-undulate sculpture devoid of maculation.

Unlike the new genus, the monotypic Pronyssiformia is distinct in the larger size and a robust habitus, by the presence of an irregular row of large setigerous pores along the suture, as well as in only two setae located at the posterior margin of each abdominal sternite including the last one.

Rhytidophaena differs well from the new genus by the shorter labrum, short apical labial palpomere, asetose clypeus, flattened nonglobular pronotum, numerous stout setae on the femora and the hairless posterior margin of the last abdominal sternite.

From both fossil genera, Palaeopronyssiformia and Palaeoiresina , the new genus is distinguished by the shape of a bidentate labrum, the apicad converging elytra and the shape of elytral apex with a sharp sutural spine (for more details, see the description and diagnosis of the new species below).

Figures

FIGURE 17. Simplified reconstruction of the habitus of Goriresina fungifora gen. n., sp. n., holotype, dorsal view.

FIGURES 3–4. Goriresina fungifora gen. n., sp. n., holotype: 3—left lateral view; 4—right dorso-lateral view.

FIGURES 5–7. Goriresina fungifora gen. n., sp. n., holotype, left lateral view: 5—head and pronotum; 6—labrum; 7—mouth parts. Abbreviations: lss—left scape seta; lcs—left clypeal seta; fts—left fore-trochanter seta; llb—left latero-basal seta; lla— left latero-apical seta; la—left apical seta; ra—right apical seta; rla—right latero-apical seta; lb—labrum; lmn—left mandible; mxp—maxillary palps; lbp—labial palps; cas—cardo setae; sts—stipes setae.

FIGURES 8–10. Goriresina fungifora gen. n., sp. n., holotype: 8—head and labrum, right dorso-lateral view (arrow points to the synnema of Ophiocordyceps sp.); 9—labrum, right dorso-lateral view; 10—reconstructed contour of the labrum, dorsal view. Abbreviations: raso—right anterior supraorbital seta; rlb—right latero-basal labial seta; rla—right latero-apical labial seta; rmn—right mandible; rmxp—right maxillary palp.

FIGURES 11–16. Goriresina fungifora gen. n., sp. n., holotype: 11—elytra; 12—punctation and pubescence of shoulders area of right elytron; 13—lateral edge of right elytron; 14—right thoracic and abdominal segments; 15—legs; 16—middle left tarsus. Abbreviations: cv—costal vein of right wing; mte—metepisternum; as1—first abdominal sternite; hc—hind coxa; fr—fore right leg; mr—middle right leg; fl—fore left leg; ml—middle left leg; hl—hind left leg; I–V—middle tarsomeres; cl—claws.