Tingiometra yuripopovi, Golub & Heiss, 2020

Golub, Viktor B. & Heiss, Ernst, 2020, Three new species of the lacebug genus Tingiometra from Cretaceous Burmese amber (Hemiptera: Heteroptera: Tingidae: Tingiometrinae), Zootaxa 4767 (4), pp. 531-542 : 538-541

Tingiometra yuripopovi sp. nov.

Figs. 12 , 13

Type Material. Holotype female, Fig. 12 , BUB-TING-10 (18/25), CEHI.

Paratypes: male Fig.13 , BUB-TING-10a 16/19-3 (left wing set aside); female BUB-TING-10b; female? BUB- TING-10c (18/25); female? BUB-TING-10d (17/09); female, badly damaged BUB-TING-10e (18/22). Holotype is embedded in a block of transparent artificial resin.

Diagnosis. Tingiometra yuripopovi sp. nov. differs from T. burmanica , e.g., by significantly smaller size (2.20– 2.38 mm; vs body length 3.1mm), shorter and wider head (1.27–1.46 times as long as width; vs head about 3.6 times as long as width), discoidal area of hemelytra with five large cells with many small areolae (vs three large cells), antennae much shorter (see description; vs antennal segments I, II, III, IV measuring 0.15, 0.70, 0.22, 0.40 mm), wider pronotum 1.30–1.59 times as wide at base as long (vs 1.33 as long as wide), wider scutellum 1.43–1.50 times as wide at base as long (vs 1.5 times as long as wide), wider costal area of hemelytra with 3–4 rows of areolae at basal third of its length (vs one row of areolae on whole length).

This new species differs from T. pankowskii sp. nov. and T. secunda sp. nov. by smaller size (vs body length 3.1 mm in T. pankowskii sp. nov. and 3.13 in T. secunda sp. nov.), shorter antennae (vs 1.56 mm in T. pankowskii sp. nov. and 1.54 mm in T. secunda sp. nov. (vs lengths of antennal segments as given in their descriptions), wider costal area of hemelytra with 2–3 rows of areolae at anterior part of its length (vs very narrow costal area with only one row of very or extremely small areolae in both other species), narrower subcostal area with 3–4 rows of areolae in most of its length except of apical part (vs 7 rows in T. pankowskii sp. nov. and 10–11 rows in T. secunda sp. nov. at the widest middle part of this area).

Description. Smaller size. Body elongate, 1.83–2.07 times as long as wide in female (paratype 17/09, 18/25), nude. Paranota and hemelytra with rounded and angular small areolae.

Head 1.27–1.46 times as long (from apex of clypeus to posterior margin of eyes) as width of head across eyes in holotype, preocular portion (frons and clypeus together) narrower and 1.65–1.92 times as long as postocular one (including vertex and frons together). Clypeus with crest on its surface. Eyes not very big, moderately protruding on the sides of the head. Antenniferous tubercles small, adhering. Antennae rather short and very thin except thickened segment I, about 2.8–3.46 times as long as width of head; segment II longest, slightly thickening towards the apex; segments III and IV shorter and thinner than segment II.

Pronotum narrow anteriorly and strongly widening posteriorly, 1.30–1.59 times as wide at base as long, its anterior margin slightly sinuate, with insignificantly elevated, very narrow areolate ring-shaped structure (hood) having one row of very small areolae in holotype male, without such structure in paratypes; posterior pronotal margin insignificantly sinuate. Lateral pronotal margin straight; anterolateral angles obtuse; posterolateral angles rather widely rounded; pronotal disk distinctly convex in female holotype and flat in paratypes females, in rather coarse puncture, with a low longitudinal median carina, consisting of a longer posterior part and shorter anterior one; the two parts of carina separated by transverse impression, posterior portion of the carina approximately 3 times as long as the anterior one. Paranota slightly reflexed, rather narrow and with one row of areolae at the posterior half of its length, extending anteriorly and with several areolae of the second row. Posterior margin of pronotum not produced and not overlapping scutellum which is entirely visible in dorsal view.

Scutellum large, triangular and completely exposed, 1.43–1.50 times as wide at base as long, its apex straight cut, slightly raised and distinctly enlarged.

Hemelytra submacropterous, covering apex of abdomen. Corium divided into costal, subcostal, discoidal and sutural areas, with moderately large, rounded and angular, mostly pentagonal areolae. Stenocostal lamina absent. Costal area rather wide, with 3 rows of areolae at base, posteriorly with 2 rows, and one row only at the apex (holotype) or on posterior half (paratypes). Subcostal, discoidal, and sutural areas distinctly separated by carinate veins. Subcostal area declivous, divided by 2–3 transverse carinate veins, with 3–4 rows of areolae in most of its length and with 5–6 rows in the apical quarter. Discoidal area very wide, delimited by vein R from exteriorly, and by vein Cu from interiorly, with about 22 irregular rows of areolae at widest part, divided by longitudinal curved carinate vein M and by four short transverse carinate veins located obliquely to the longitudinal axis of the body; three short transverse veins connect M with Cu and one vein connects M with R; as a result discoidal area is divided into five large cells: external basal and apical cells adjoining to subcostal area and three internal cells (basal, medial and apical) located closer to the longitudinal axis of the body and adjacent to clavus and sutural area of hemelytron; external basal cell is the largest. Every large cell of discoidal area contains many small angular areolae. Sutural area narrow, with 1 row of areolae in the basal half, posteriorly slightly widening and with 2 rows of areolae at apex. Membrane absent. Clavus distinct, large, with 6 rows of areolae at widest part. Commissure longer than scutellum.

Venter. Bucculae very short, occupying only the apex of head ventrally, closed anteriorly, surrounding the base of labium like a cover. Labium reaching middle coxae. Lateral margins of abdomen delimited by rib-like hypocostal laminae, without distinct areolae. Triangular posterior margin of mesoternum having median narrow outgrowth covering the anterior margin of metasternum. Abdominal sternites II and III completely fused, sternites IV–VIII separated by transverse furrows, lateral and medial projections of segment VII not found.

Legs long and slender, femora and tibiae cylindrical, the latter slightly thickened at apices; tarsi two-segmented, claws thin and rather long, pulvilli not discernible.

Measurements (in mm). Body length from clypeus to apex of hemelytra in holotype 2.30, in paratypes 2.20 (min)–2.38 (max); body width with wings folded in repose 1.12–1.20; head length from apex of clypeus to posterior margin of eyes 0,38; head length including postocular portion 0.51–0.55; length of anteocular portion 0.25–0.28; length of eye 0.10–0.13; length of postocular portion 0.13–0.17; head width across eyes 0.26–0.30; width of anteocular part of head 0.14–0.15; maximal width of postocular part 0.25; length of antenna 0.85–0.90, length of antennal segments (I, II, III, IV) 0.10–0.11, 0.35, 0.15–0.19, 0.25; pronotum length 0.38–0.43, pronotum width 0.6–0.63; length of anterior portion of pronotal carina 0.09; length of its posterior portion 0.28; scutellum length 0.2–0.23; scutellum width 0.25–0.33; hemelytra length 1.45–1.63; length of commissure between clavus and corium 0.53–060; femora length: fore 0.38, middle 0.33–0.40, hind 0.5–0.53; tibiae length: fore 0.50–0.60, middle 0.68; hind 0.80–0.88; length of tarsi 0.13.

Distribution. Burmese amber, northern Myanmar.

Etymology. The name is a patronym honouring our friend, the late Yuri Popov, eminent expert of fossil insects and author of basic literature in this field.

Figures

FIGURE 13. Tingiometra yuripopovi sp. nov., paratype male (16/19.3), dorsal view. Scale 1mm.

FIGURES 9–12. 9,10 Tingiometra pankowskii sp. nov., 9, paratype male (?) (7303-1), dorsal view, 10, paratype male (?) (7303-1), ventral view; 11, Tingiometra secunda sp. nov., holotype female (16/19-2), dorsal view; 12, Tingiometra yuripopovi sp. nov., holotype female (18/25), dorsal view. Scales 1mm.