Bibio crassinervis Skartveit & Pika, 2014

Skartveit, John & Krizmanić, Katarina, 2020, Revision of fossil Bibionidae (Insecta: Diptera) from the Miocene of Radoboj, Croatia, Zootaxa 4759 (3), pp. 351-378 : 361-362

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Bibio crassinervis Skartveit & Pika, 2014


Bibio crassinervis Skartveit & Pika, 2014

( Fig. 8 View FIGURE 8 )

This species was formally described from Öhningen by Skartveit & Pika (2014), though the name is apparently a cabinet name used by Oswald Heer. The available specimen was identified as Bibio lividus Heer , but does not belong to the same species as the holotype of Bibio lividus .

Material: 1 female ( CNHM 1837 View Materials )

Description of the Radoboj specimen

Female (N=1) Total length 11.6 mm.

Head: Length 1.5 mm. Complex eye of medium size, not prominent. Palp black, rather short and stout. Antenna not preserved.

Thorax: Length 3.2 mm. Dorsum entirely brownish-black. The microsculpture on mesonotum is fine and meshy, laterally with slight, transverse wrinkles. Halter pale brownish.

Wing: Length 9.5 mm, width 3.5 mm, length/width = 2.8. Hyaline with brown, distinctive R-, M- and CuAveins. Pterostigma rather small, black, distinctive. Humeral crossvein apparently absent, Subcosta unpigmented but distinctive, straight. Costa extends to half-way between apices of R 4+5 and M 1. Radial sector about three times as long as crossvein R-M. Crossvein M-Cu joins M 2 some distance beyond furcation of M, M 2 bent at this point. CuA 1 and CuA 2 apically straight. CuP fine but distinctive, straight. Vein measurements: Basal R 3.7 mm, distal R 1 2.0 mm, R s 1.1 mm, R 4+5 4.2 mm, R-M 0.37 mm, basal M 3.7 mm, distal M 1.3 mm, M 1 3.3 mm, M 2 3.0 mm, M-Cu 0.55 mm, CuA 4.5 mm, CuA 1 3.5 mm, CuA 2 2.3 mm. Pterostigma 1.35 mm long, 0.50 mm wide.

Legs: Yellowish-brown.

Abdomen: Blackish-brown. Length 8.5 mm, width 3.0 mm. Tergites with fine, meshy microsculpture.

Terminalia: Last tergite apparently with V-shaped, mesal indentation.