Bathymyza longirostris Emeljanov et Shcherbakov, 2020

Emeljanov, A. F. & Shcherbakov, D. E., 2020, A NEW GENUS OF DICTYOPHARIDAE (HOMOPTERA) FROM BITTERFELD AMBER BASED ON A NYMPH, Far Eastern Entomologist 403, pp. 1-12 : 3-7

Bathymyza longirostris Emeljanov et Shcherbakov , sp. n.

http://zoobank.org/NomenclaturalActs/90c513ef-fb2a-4d91-9191-b39f2539d77a

Figs 1–11

MATERIAL. Holotype, MB.I. 1548, 1st (2nd?) instar nymph; Goitzsche near

Bitterfeld; Bitterfeld (Saxonian) amber; Eocene.

DESCRIPTION. Young nymph of medium-sized planthopper. Dark brown

(mostly covered with silvery gas film), moderately elongate, 3.2 mm long, 1.4 mm

wide; head projecting forwards; dorsum finely transversely shagreened. Coryphe somewhat longer than wide, depressed towards median line, V-shaped in cross-

section, with well-developed lateral carinae and median groove and vestigial transverse groove in distal half; its lateral and anterior margins forming nearly regular parabola, and posterior margin situated about eye midlength in dorsal aspect. Metope with vestigial median carina; intermediate carinae arched laterad;

medial area broad, lancet-arched above, widest at 1/3 length from head apex,

narrowed to clypeus; lateral areas parallel-sided, comparatively narrow, dorsally widened and faced laterad, with two rows of sensory pits; inner row of sensory pits reaching upper margin of clypeus, outer row incomplete ventrally, ending near lower eye margin, far from clypeus; both rows shortly interrupted slightly dorsal to lower eye margin (see Discussion). Boundaries of metope and postclypeus

(epistomal suture) and of post- and anteclypeus arched dorsad, medially obsolete.

Postclypeus with lateral carinae, without median carina, tapered apically, about as long as anteclypeus. Rostrum very long, reaching well beyond apex of abdomen,

apical segment much shorter than subapical one. Pedicel thrice longer than scape,

with at least 3 sensory plaque organs, third segment (base of flagellum) large, wider than 1/2 of pedicel (see Discussion).

ventral view; 3 – habitus, lateral view; 4 – head, ventral view; 5 – abdomen, caudal view.

Scale bars, 1 mm (1–3), 0.5 mm (4) and 0.2 mm (5).

Pronotal disc strongly projecting forwards (more than 1/2 of its median length situated anterior to level of posterior eye margins), its anterior margin arcuately convex, anterolateral angles obtuse, lateral margins anteriorly parallel, then curved,

posteriorly diverging backwards. Posterior margin of pronotum with deep, nearly right-angled emargination reaching almost 1/4 of pronotal disc length. Pronotal disc slightly ventral view. Scale bar, 0.5 mm.

wider than, and about as long along midline as, coryphe, bordered with distinct carinae along anterior and anterolateral margins; median carina distinct; posterolateral discal carinae absent, boundary between discal and paradiscal areas traceable only as flexure of surface plane (posterior ends of these flexures close to points where lateral carinae of mesonotal disc approach pronotal margin). Sensory pits of pronotal ventral view; 10 – pronotum, lateral view; 11 – abdomen, caudal view.

disc and paradiscal areas forming one entity: disc with row of 6 larger pits along lateral margin and 3 smaller pits in second, more medial row; paradiscal area with 7

pits in marginal row. Humeral area with 4 pits in row; pectoral group of 4 pits near posterior margin of paranotal lobe. Lateral and collateral carinae distinct. Mesonotal disc arrow-shaped anteriorly, discal carinae converging there nearly at right angle,

running parallel to posterior pronotal margin; median carina double; 2 pits in oblique row laterad of discal carinae. Paradiscal area of mesonotum near lateral margin posteriorly with 3 pits (in triangle). Wing pads not developed yet; lateral margin of mesonotum shorter than that of metanotum. Metanotal disc rectangular, about 1.2

times as wide as long, with all carinae distinct; median carina double; 2 pits in oblique or subtransverse row laterad of discal carinae (similar to that on mesonotum);

paradiscal area near lateral margin subapically with 2 pits in oblique row. Fore legs not flattened, similar to, and slightly longer than, mid legs. Fore femora without subapical tooth on posteroventral carina. Fore and mid tibiae not widened,

relatively slender. Hind tibiae without lateral spines, with 4 spaced apical teeth.

Hind tarsus two-segmented, tarsomere I with 4 spaced apical teeth, tarsomere II much shorter than I, without lateral teeth; claws small.

Abdomen with well-developed middorsal carina, weak intermediate carinae

(absent on tergites IV–V), and without sublateral carinae. Tergites I–III without pits. Tergites IV–V with long (complete) rows of 9–10 pits, 8th pit (from body midline) displaced anteriad (sometimes there are 2 such pits, 6th and 8th, forming rudimentary second row anteriorly – see Fig. 8 ). Tergite VI with 1 pit medially and

3 pits laterally, VII with 1 pit medially, VIII without pits. Laterotergite VIII not enlarged. Tergite IX with 2 medial pits dorsally and 1 pit ventrally (at each side).

Wax plates situated in subtriangular posterolateral areas of tergites VI–VIII, separated from rest of tergite by carina and facing posteriad. Wax plates of uniform structure,

large, crescent-shaped (VI) to subtriangular, with individual wax filaments discernible.

ETYMOLOGY. From Latin longus (long) and rostrum (bill, beak).

Figures

Figs 1–5. Bathymyza longirostris sp. n., holotype: 1 – habitus, dorsal view; 2 – habitus,

Figs 6–7. Bathymyza longirostris sp. n., holotype: 6 – body, dorsal view; 7 – body,

Figs 8–11. Bathymyza longirostris sp. n., holotype: 8 – body, dorsal view; 9 – head,