Archistempellina falcifera

Zakrzewska, Marta, Krzemiński, Wiesław & Giłka, Wojciech, 2016, Towards the diversity of non-biting midges of the tribe Tanytarsini from Eocene Baltic amber (Diptera: Chironomidae), Palaeontologia Electronica (Ottawa, Ont.) 12 (1), pp. 1-21 : 3

Archistempellina falcifera

Giłka and Zakrzewska, 2013

Figure 1

2013 Archistempellina falcifera Giłka and Zakrzewska in Giłka et al., p. 573, figure 2 (male).

2014 Archistempellina falcifera Giłka and Zakrzewska in Zakrzewska and Giłka, p. 342 (in key).

Material examined. Adult male (tarsi of right mid and left hind legs missing) in 20.5 x 7.5 x 6.5 mm piece of amber ( Eocene , ~40-45 Ma, Gulf of Gdańsk; CCHH 257-1 , Figure 1 ); animal syninclusions: Orthocladiinae (1 female), Aphidodea (1 ind.) .

Remarks. The recently established genus Archistempellina is known from three species described on the basis of amber inclusions collected from the Rovno region, two of which are also present in the Hoffeins collection of amber from the Gulf of Gdańsk. Based on the specimen presently examined, the original description of Archistempellina falcifera is thus supplemented with the following characters: wing length 1460 μm, VRCu 1.27; thorax chaetotaxy: Ac at least 24, Dc at least 17-18 on each side, Pa 3-4 on each side, Sc at least 10; fore leg tibia bearing a single spur along with strong subapical bristles. Measurements of leg segments and leg ratios are compiled with those taken from the holotype specimen in Table 2.

Figures

FIGURE 1. Tanytarsini - inclusions in Baltic amber from the Hoffeins collection (for details see Table 1 and Material examined).