Makarkin, Vladimir N., Wedmann, Sonja & Weiterschan, Thomas, 2012, First record of a fossil larva of Hemerobiidae (Neuroptera) from Baltic amber, Zootaxa 3417, pp. 53-63: 54-56

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http://doi.org/ 10.5281/zenodo.281962

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Hemerobiidae  indet., larva

Figs. 1View FIGURE 1, 2View FIGURE 2

Description. Larva approximately 3.6 mm long (including mouthparts), rather swollen.

Head somewhat retracted into prothorax. Head capsule about 0.36 mm long, about 0.36 mm wide; area between antennae and basal parts of mouthparts not clearly visible. Mandibles, maxillae form sucking mouthparts (their parts hard to distinguish from each other); mouthparts slightly shorter than head capsule width, smoothly curved inward; maxillae apparently slightly longer than mandibles with apex somewhat blunt. Antennae slightly longer than head capsule width, distinctly three-segmented; basal segment short, rounded, with smooth surface; second segment approximately twice as long, conspicuously stouter than third segment, both with annulated surfaces; apex of antenna with short bristle. Labial palps three-segmented, slightly shorter than mandible length; two basal segments cylindrical, both slightly longer than wide; terminal segment fusiform, length approximately equal to length of two basal segments together. Dorsal ecdysial lines distinct, Y-shaped. Each eye with four stemmata.

Cervix short, transverse, forming collar which slightly overlaps posterior margin of head capsule. Anterior subsegment of prothorax broad, about 0.6–0.7 mm wide and about 0.3–0.4 mm long; lateral dorsal sclerites large, crescent-shaped. Posterior subsegment of prothorax, meso-, metathorax poorly visible, no measurements can be given.

Legs relatively short, stout, robust. Coxa elongate, stout; trochanter indistinctly visible, apparently elongate; femur rather short, stout; tibia short, only slightly longer than tarsus; claws rather short; empodium between claws short, pad-shaped ( Fig. 2View FIGURE 2 D).

Abdomen poorly preserved, in general swollen.

Remarks. Some details of the larva are indistinctly visible. The maxillae and their association with the mandibles might be slightly different in the drawing and photo as there are reflecting fractures that disturb the view. The abdomen is obscured by a milky covering and the boundaries between the segments are not clearly visible.

The presence of a short, pad-shaped empodium clearly shows that this is a 2 nd or 3 rd instar larva; the empodium is long and trumpet-shaped in the first instar larva of Hemerobiidae  . Most probably this is a 2 nd instar larva, judged from its relatively small size. Such small 3 rd instar larvae are unknown in any species of extant Hemerobiidae  . For instance, in Sympherobius amiculus ( Fitch, 1855)  the 2 nd instar larva is 2.81 mm long, and the 3 rd instar larva is 4.8 mm long ( Smith 1923); in Psectra diptera ( Burmeister, 1839)  the 2 nd instar larva is 3.75 mm long, and the 3 rd instar (full-grown) larva is 5.5 mm long ( Killington 1946); in Megalomus fidelis ( Banks, 1897)  the mature 2 nd instar larva is 3.32 ± 0.43 mm long, and the mature 3 rd instar larva is 4.53 ± 1.05 mm ( MacLeod 1961).