Aneurus (cf. Paraneurosoma) damzeni Heiss, 1825

Aneurus (cf. Paraneurosoma) damzeni Heiss View in CoL View at ENA , sp. nov.

( Figs. 1–10 View FIGURES 1–2 View FIGURES 3–6 View FIGURES 7–10 )

Type material. Holotype: collection number “BAL-ANEU-07” ( CEHI) (ex. coll. Jonas Damzen JDC 7503); adult, female. A complete specimen with ventral side completely obscured by “milky opacity” included in a transparent, yellow amber piece with approximate dimensions of 32 mm × 21 mm and a maximum thickness of 10 mm; preserved without supplementary fixation. Syninclusions: few small stellate trichomes, and some small gas vesicles.

Type stratum. A predominantly Bartonian age (41.3–37.9 Ma) is interpreted for the extinct Central European resin-producing forests, which produced the amber that has eroded out of the Eocene Blue Earth layers ( Bukejs et al. 2019). However, the vast majority of Baltic amber derives from the geological amber-bearing strata that have been assigned a Priabonian age (37.8–33.9 Ma) ( Sadowski et al. 2017, 2020).

Type locality. Baltic Sea coast, Yantarny settlement (formerly Palmnicken), Sambian (Samland) Peninsula, Kaliningrad Region, Russia .

Diagnosis. Aneurus damzeni sp. nov. shares only with A. ursulae the following combination of characters: triangular scutellum, bisinuate lateral margins of pronotum and conical apical tubercles on genae. A newly described species differs from it by distinctly longer antennae (2.04 times as long as width of head; 1.43 in A. ursulae ) and lacking a contergite on deltg II.

Description. Macropterous female, body elongate oval, hemelytra complete, spread laterally; ventral structures obscured in natural condition.

Head. Slightly wider than long ( 0.65 mm / 0.55 mm); apex of clypeus rounded, reaching base of antennal segment II; genae shorter than clypeus adhering with a conspicuous apical tubercle; antenniferous lobes short and blunt; antennae long an slender, about twice as long as width of head, length of cylindrical antennal segments I / II / II / IV = 0.18 / 0.32 / 0.34 / 0.49 (in mm); eyes oval inserted in head, postocular lobes roundly produced reaching outer margin of eyes, then strongly converging to constricted collar; rostrum shorter than head arising from an open atrium.

Pronotum. About twice as wide as long ( 1.31 mm / 0.61 mm), lateral margins bisinuate converging anteriorly, anterolateral angles rounded, slightly produced over collar; disk flat with two oval impressions on anterior lobe; posterior margin straight.

Scutellum. Triangular, wider than long ( 0.61 mm / 0.52 mm), basal and lateral margins carinate; disk with a median longitudinal elevation, transversely rugose laterally.

Hemelytra. Clavus and corium distinct, the latter with two carinate veins, truncate posteriorly; membrane fully developed without veins; hind wings lanceolate, reaching to posterior margin of deltg V, with two veins.

Abdomen. Deltg II–VI separated by sutures; tergal plate consisting of fused mtg III–VI with usual pattern of flat apodemal impressions, anterior margin convex, contergite on deltg II not traceable; tergite VII about six times as wide as long.

Venter. Sternite III–VII separated by transverse sutures, posterior margin of sternite VI concave at middle confining sternite VII; ventral hem and longitudinal suture usually marking the inner margin of vltg II–VII are not developed, spiracles not discernible.

Legs. Femora incrassate, tibiae cylindrical, tarsi two-segmented with curved claws and pulvilli.

Measurements. Body length 4.7 mm; maximum width of abdomen 1.81 mm; hind wing length / width 1.79 mm / 0.60 mm.

Etymology. Patronymic. This interesting species is dedicated to Jonas Damzen ( Vilnius, Lithuania) who provided this and several other amber inclusions of Heteroptera to the first author.