A new fossil species of the genus Bibio, with an update on bibionid flies from Baltic and Rovno amber (Diptera, Bibionidae) Author Skartveit, John https://orcid.org/0000-0001-7614-3399 NLA University College Bergen, P. O. Box 74 Sandviken, N- 5812 Bergen, Norway john.skartveit@hotmail.com text Deutsche Entomologische Zeitschrift 2021 2021-01-27 68 1 81 99 http://dx.doi.org/10.3897/dez.68.60611 journal article http://dx.doi.org/10.3897/dez.68.60611 1860-1324-1-81 2AD03B672D3B4B03A37359854A506F3E E49FE28F84D353F6ADDF2598DB8661F2 Plecia clavifemur Skartveit, 2009: 15-16 Fig. 4 Type material, females. Holotype, SDEI Dip-00830 - CCHH#1474.2. Paratypes SDEI Dip-00845 - CCHH#1505.1; SDEI Dip-00846 - CCHH#1501.5. Additional material, females. JS-Baltic-002, in piece of amber 20 x15x 4 mm , JS-Baltic-003, in piece of amber 18 x13x 6 mm . These specimens do not reveal any characters not seen in the type material, but their morphometric data is given below. Total length 3.47-4.62 mm . Head: Length 0.42 mm (N = 1), width 0.57-0.60 mm . Flagellum length 0.40-0.47 mm , width 0.08 mm (N = 2). Thorax: Length 0.83-0.92 mm . Legs: Fore femur 0.66-0.79 mm long, 0.12-0.15 mm wide, fore tibia 0.75-1.11 mm long, 0.08-0.09 mm wide, fore first tarsomere 0.24-0.38 mm long, 0.05-0.07 mm wide, fore second to fifth tarsomeres 0.19, 0.13, 0.11 and 0.15 mm long (N = 1). Mid femur 0.88 mm long, 0.15 mm wide (N = 1), mid tibia 0.69 mm long, 0.08 mm wide (N = 1). Hind femur 0.90-1.24 mm long, 0.11-0.15 mm wide, hind tibia 0.97-1.20 mm long, 0.08-0.12 mm wide, hind first tarsomere 0.23-0.41 mm long, 0.07-0.09 mm wide. Wing: length 3.05-3.11 mm , width 1.00- 1.39 mm , length/width = 2.24-3.05. Vein lengths, all in mm: Subcosta 1.50-1.58, basal R 1.00-1.13, distal R1 0.75-0.85, Rs 0.27-0.38, R2-5 0.58-0.83, R2+3 0.16-0.23, R4+5 0.64-0.68, R-M 0.07-0.17, basal M 0.92-1.05, distal M 0.33-0.34, M1 1.20-1.37, M2 0.88-1.00, M-CuA 0.11 (N = 1), CuA 0.67-0.79, CuA1 1.12-1.54, CuA2 0.58-1.16. Abdomen: Length 2.5 mm (N = 1). Discussion. The two specimens examined are similar in the shape of the head and antenna, general aspects of wing venation (short R2+3, kinked R4+5, CuA2 bent sharply basad) and terminalia, however they are rather different with respect to some morphometric traits, particularly length of leg segments and the general shape of the wing. At the present state of knowledge I interpret this difference as within intraspecific variation, though additional material, particularly if male specimens are found, may reveal that there are more than one species involved. Figure 4. Plecia clavifemur , female. JS-Baltic-003. Photo: Jonas Damzen.