Medocellodes blackmani Drohojowska et Szwedo, 2022

Drohojowska, Jowita, Tomanek, Natalia, Gröhn, Carsten & Szwedo, Jacek, 2022, A second Aleurodicinae from the Eocene Baltic amber-Medocellodes blackmani gen. et sp. nov. (Hemiptera, Sternorrhyncha, Aleyrodidae), Zootaxa 5183 (1), pp. 245-253 : 246-248

Medocellodes blackmani Drohojowska et Szwedo sp. nov.

LSID urn:lsid:zoobank.org:act:6D0C0386-C0AF-415A-A921-1C14D2ADB90A

( Figs 1–6 )

Type material. Holotype Male. GPIH5050 (CCGG 215 – Carsten Gröhn collection), deposited in Geological‐Palaeontological Institute and Museum ( CeNak) of the University of Hamburg; Baltic amber, Gulf of Gdańsk area, Lutetian-Bartonian, Eocene (for the discussions on age of Baltic amber and related resins see Szwedo & Drohojowska 2016, Malanczuk et al. 2018; Mänd et al. 2018, Seyfullah et al. 2018). Inclusion well visible from dorsal side, ventral side partly covered with milky veil; part of abdomen and male terminalia visible .

Diagnosis. Claspers about 0.3 of total length of abdomen with genital block (claspers 0.2 in Paernis ); inner margin of claspers with two eminences (no such eminences in Paernis ); without setae (two basal and four subapical setae in Paernis ); Fore wing wide, length/width ratio not exceeding 2 (over 2 in Paernis and Rovnodicus ).

Description. For measurements see Table 1. Head with compound eyes narrower than pronotum. Vertex subtrapezoid, anterior margin shallowly concave; lateral margins S-shaped, diverging posteriorly, posterior margin concave; disc of vertex concave; postocular area distinct; coronal suture present, short. Frons concave, with distinct median ocellus, visible from above. Compound eyes large, bulged, not divided. Ommatidia of same size. Antenna with seven visible antennomeres; scapus not visible; pedicel well visible, large and massive, about 4× as wide as 3 rd antennomere; 3 rd antennomere the longest, about 3.2× longer than 4 th antennomere; 4 th antennomere merely shorter than 5 th and 6 th antennomeres; apical antennomere, the 7 th shorter than subapical one, with two short terminal setae.

Pronotum wider than head with compound eyes, wider than mesoscutum; anterior margin concave slightly shifted cephalad medially, posterior margin slightly concave; lateral margins subtriangular, longer than pronotum in midline, slightly converging anteriad.

Mesopraescutum distinctly separated, subtriangular; merely wider at base than long in mid line; ¼ of width of pronotum; anterior margin acutely incised, lateral angles acute.

Mesoscutum U-shaped, narrower medially, with anterior angles rounded, about 6× wider than long in mid line; anterior margin acutely incised, anterolateral margin S-haped, diverging posteriad, posterolateral angles elongately produced, posterolateral margins slightly arcuate, converging posteriad, posterior margin shallowly concave.

Mesoscutellum as narrow band, with median portion distinctly longer, rounded; lateral sections narrowing, parapteron relatively large in comparison with plates of mesothorax, oval.

Mesopostnotum triangular, with anterior angles acute, apex rounded, similar to mesopraesutum but smaller.

Forewing distinctly widening apicad, widest at ⅔ of its length, 1.9× longer than wide. Costal margin strongly curved at base, then merely arcuate, antroapical angle widely rounded, apical margin slightly arcuate, posteroapical angle angulately rounded, posterior margin almost straight, basiclaval margin widely arcuate; margins of fore wing covered with tubercles. Basal section of ScP+R+CuA strengthened, section ScP+R straight, ScP+RA separated slightly basad than half of forewing length, at wide angle, about 135°, slightly arcuate, not reaching margin; branch RP straight, about 1.45 as long as branch ScP+RA, directed to apex, not reaching margin; branch CuA leaving common stem at ⅛ of fore wing length, at acute angle about 30°, long and straight, not reaching margin; claval vein CuP distinct, claval apex slightly exceeding half of forewing length.

Hind wing weakly visible, superimposed by forewing; right hind wing partly curled; hind wing narrow at base, widening apicad, widest at ⅔ of its length, about twice as long as wide; posteroapical angle widely rounded, posterior margin arcuate.

Legs weakly visible, covered by milky veil.

Abdomen dorsally covered under fore- and hind wings; ventrally covered with milky veil at base; wax plates not visible; posterior pregenital segments visible, male terminalia visible. Aedeagus elongate, wider, funnel shaped at base, its length exceeding half of length of claspers; claspers elongate, tapering apicad, external margin mildly arcuate, internal surface with two eminences in median portion, distal portions acute, curved dorsad, not crossing apically.

Etymology. Specific epithet is named after the late eminent aphidologist Roger L. Blackman.

Age and occurrence. Eocene, Lutetian-Bartonian; Gulf of Gdańsk area (secondary deposit).

Figures

FIGURES 1-6. Medocellodes blackmani gen. et sp. nov. 1. drawing of body, dorsal side; 2. body dorsal side; 3. head, dorsal side; 4. thorax, dorsal side; 5. male terminalia, ventral side; 6. body, ventral side. Scale bars: 0.5 mm for 1, 2, 6; 0.2 mm for 3–5.