Incertae sedis

HAKIM, MARINA, HUANG, DI-YING & AZAR, DANY, 2022, Debris-carrying psocodean nymph from Lebanese amber, Palaeoentomology 5 (3), pp. 222-225 : 222-223

Family Incertae sedis

( Figs 1–3 )

Material. Specimen number AD-33; well-preserved immature psocodean ( Fig. 1A, B ), female; no syninclusions.

Locality and horizon. Ain Dara, CazaAley, Mouhafazit Jabal Loubnan (Mount Lebanon Governorate), Lebanon; Lower Cretaceous, lower Barremian ( Maksoud et al., 2017; Maksoud & Azar, 2020).

Description. Head: Measurements in dorsal view, around 0.36 mm wide (compound eyes included), 0.21 mm wide (vertex); epicranial suture faintly visible; no ocelli, large compound eyes globulous, semi-circular in dorsal view, 0.14 mm long, protruding with a width of 0.07 mm; left antenna almost complete, with 15 antennomeres preserved, shorter than body length; mouthparts unclear due to specimen distortion, fractions in amber and mirror effect, maxillary palp four-segmented, labial palp two-segmented, lacinia present ( Fig. 1C ). Thorax: mesonotum and metanotum almost of equal length, both 0.30 mm long; wing buds visible on both thoracic segments; tibiae slender, setose with two apical spurs; all tarsi two-segmented, ratio of basal to apical segment: in fore and mid legs 1:1, in hind legs 1.8:1, basal tarsomere with two apical spurs, apical tarsomere bearing claws with one preapical tooth ( Fig. 1D ), without empodium or pulvillus. Abdomen: ten segments visible, with multiple glandular structures clustered mainly along the edge of each abdominal segment ( Fig. 2 ); epiproct apically rounded, with seven long spurs; two lobe-like structures bearing one short spine each (paraprocts?); genitalia not fully developed, but of female type, with two distinct structures bearing long and thick spines apically ( Fig. 3 ).

Figures

FIGURE 1. Immature psocodean, specimen number AD-33. A, Habitus in dorsal view. B, Habitus in ventral view. C, Details of labial palpomeres and lacinia. D, Details of claws (arrow indicating preapical tooth). Scale bars = 0.3 mm for A, 0.5 mm for B, 0.05 mm for C, 0.03 mm for D.

FIGURE 2. Abdominal glandular structures. A, General view. B, Detailed view. Scale bars = 0.05 mm.

FIGURE 3. Details of terminalia. A, Photograph. B, Illustration. Scale bars = 0.1 mm.