Hemerobiidae, Latreille, 1802

Nakamine, Hiroshi, Yamamoto, Shûhei & Takahashi, Yui, 2022, Archaeomegalomus gen. nov.: A remarkable new brown lacewing from mid-Cretaceous Kachin amber from northern Myanmar (Neuroptera: Hemerobiidae), Zootaxa 5178 (4), pp. 380-390 : 386-388

Hemerobiidae gen. et sp. indet.

( Fig. 4 )

Description. The body and wings are not clearly visible due to many cracks. Length ca. 3.6 mm as preserved (measured from vertex to apex of the abdomen). Head poorly preserved; eyes large; antennae composed at least 27 flagellomeres with scattered fine setae on each segment. Thorax covered with dense thin setae; pronotum rather short. All legs slender, covered with dense thin setae; all tibia slightly swollen at the middle with paired tibial spurs. Wings poorly preserved; forewing hyaline, oval, ca. 3.5 mm long; trichosors present along the entire wing margin, one trichosor between adjacent veins, marginal portions of veins and trichosors with tufts of thin setae, humeral veinlets recurrent, costal space rather broad; hind wing hyaline, oval, ca. 3.0 mm long. Abdomen poorly preserved; terminal segment scattered with thin setae; gonostylus of gonocoxite 9 developed.

Material. Incomplete female adult ( Fig. 4 ), indiscernible many morphological details due to numerous cracks and overlapping wings and body, preserved in approximately 15 mm × 11 mm × 2.5 mm flat arcwise, dark yellow, somewhat transparent amber piece with mumerous debris and pigmentation; specimen accession number AMNH Bu-SY32.

Remarks. We assign this undetermined specimen to the Hemerobiidae because of the presence of a pair of tibial spurs, slightly swollen tibia at the middle, and recurred humeral veinlets. This undetermined specimen can be distinguished from the three burmite hemerobiids by the number of flagellomeres (this specimen has at least 27 or 28 flagellomeres, whereas there are 38 in Archaeomegalomus , 19 in Hemeroberotha ) and the costal space in the forewing (this specimen is rather broad, whereas it is very broad in Cretoneuronema ). Thus, we withheld identification of the specimen as we could not confirm the important traits of the wing venation, although we were able to differentiate it from the three previously recorded fossil species found in Burmese amber.

Figures

FIGURE 4. Habitus and Detail of Hemerobiidae gen. et sp. indet. (AMNH Bu-SY32) in mid-Cretaceous Kachin amber.A, right lateral view; B, left lateral view of terminalia. Abbreviations: ect: ectoproct; gx9: gonocoxite 9; st: gonostylus of gonocoxite 9. Scale bars: 0.5 mm for A; 0.2 mm for B.