Lonchodryinus groehni, Olmi & Vasilenko & Capradossi & Perkovsky & Guglielmino, 2021

Olmi, Massimo, Vasilenko, Dmitry V., Capradossi, Leonardo, Perkovsky, Evgeny E. & Guglielmino, Adalgisa, 2021, A new species of Lonchodryinus (Hymenoptera, Dryinidae) from Upper Eocene Baltic amber, Zootaxa 5020 (2), pp. 328-336 : 330-331

Lonchodryinus groehni sp. nov.

( Figs 1, 2 , 7 )

Type material. Holotype ♀ ( Figs 1, 2 , GPIH5024 (from Carsten Gröhn collection No. 9180)).

Locality and horizon. Yantarnyi (Kaliningrad, Russian Federation), Baltic amber, Upper Eocene (early Priabonian, 36–37 Ma).

Diagnosis. Female of Lonchodryinus Kieffer, 1905 ( Figs 1, 2 ) with ocelli present ( Fig. 1 ); OPL less than 2 × as long as POL ( Fig. 1 ); fore wing with 2r-rs&Rs vein with distal part (Rs) less than 2 × as long as proximal part (2rrs) and with curve little pronounced ( Fig. 1 ); protarsus chelate ( Figs 1, 2 ); chela without rudimentary claw ( Fig. 7 ); inner side of enlarged claw with proximal prominence bearing one long bristle ( Fig. 7 ).

Description of f emale holotype. Macropterous ( Figs 1, 2 ); length ca. 2.7 mm. Black, except antenna and legs brown. Antenna 08-flagellomered, short and slender, covered with dense and short setae, slightly thickened distally; antennal ADOs absent; ratio of antennomeres: 9:5:12:8:7:7:5:5:4:4; antenna much shorter than body, more than twice as long as head (length of head measured dorsally from occipital carina behind ocelli to distal apex of mandible): 55:22. Dorsal surface of head slightly convex, dull, with vertex punctate, unsculptured among punctures; mandible quadridentate, including one intermediate rudimentary tooth; frontal line complete; occipital carina complete; POL = 3; OL = 2; OOL = 8; OPL = 3.5; TL = 8; greatest breadth of lateral ocelli about as long as POL; eye normally bulging, much shorter than head (12:22); hypostomal bridge much shorter than head (2:22). Palpal formula 6/3. Head much shorter than mesosoma (22:40). Mesosoma shorter than metasoma (40:53). Pronotum dull, setose, crossed by anterior transverse furrow, shorter than head (8:22), with disc longer than anterior collar (6:2). Pronotal tubercles reaching tegulae. Pronotum shorter than mesoscutum (8:13). Mesoscutum shiny, setose, punctate, unsculptured among punctures. Notauli ( Fig. 1 ) complete, posteriorly separated; minimum distance between notauli about as long as POL. Mesoscutellum shiny, setose, shorter than mesoscutum (7:13), punctate, unsculptured among punctures. Metanotum dull, much shorter than mesoscutellum (2.5:7). Metapectal-propodeal complex not visible, because hidden under wings. Mesopleuron and metapleuron only partly visible, apparently punctate, unsculptured among punctures. Epicnemium not visible. Fore wing hyaline, not darkened, with the usual venation of Lonchodryinus . Pterostigma oval, longer than broad (19:3.5); 2R1 cell open; 2r-rs&Rs vein with distal part (Rs) less than twice as long as proximal part (2r-rs) and with curve little pronounced ( Fig. 1 ); 2r-rs&Rs vein not forming an angle between proximal and distal parts; forewing with the usual three basal cells clearly enclosed by pigmented veins (C, R, 1Cu cells). Hind wing hyaline. Proleg ratio: 18 (procoxa): 7 (protrochanter): 25 (profemur): 13 (protibia): 10 (protarsomere 1): 3 (protarsomere 2): 3 (protarsomere 3): 8 (protarsomere 4): 12 (protarsomere 5). Enlarged claw ( Fig. 7 ) slightly shorter than tarsomere 5 (11:12), with inner margin hardly visible, with proximal prominence bearing one long bristle (b in Fig. 7 ), apparently without lamellae. Protarsomere 5 with lamellae on inner margin and on distal apex (number of lamellae indistinct). Arolium shorter than enlarged claw (5:11). Mid leg ratio: 10 (mesocoxa): 6 (mesotrochanter): 18 (mesofemur): 19 (mesotibia): 14 (mesotarsomere 1): 5 (mesotarsomere 2): 4 (mesotarsomere 3): 3 (mesotarsomere 4): 4 (mesotarsomere 5). Hind leg ratio:? (metacoxa):? (metatrochanter): 18 (metafemur): 20 (metatibia): 15 (metatarsomere 1): 5 (metatarsomere 2): 4 (metatarsomere 3): 3 (metatarsomere 4): 6 (metatarsomere 5). Petiole not visible. Tibial spurs 1/1/2. Male. Unknown.

Etymology. The species is named after Mr. Carsten Gröhn (Glinde, Germany).

Figures

FIGURES 1–6. 1, 2, Lonchodryinus groehni, ♀ holotype. 1, dorsal view; 2, ventral view. 3, Lonchodryinus balticus, ♀ holo- type, dorso-lateral view. 4–6, Lonchodryinus ruficornis, ♀ from Sweden, Trosa. 4, head in dorsal view; 5, mesoscutum (arrow indicates a notaulus); 6, habitus in dorsal view. Scale bar 1.4 mm for 1 and 2, 1.6 mm for 3, 0.6 mm for 4, 0.2 mm for 5, 2.2 mm for 6.

FIGURES 7–8. 7, Lonchodryinus groehni, ♀ holotype. Chela. 8, Deinodryinus masneri, ♀ from USA, California, Kaweah Power Station. b = proximal bristle of the enlarged claw; c = enlarged claw; p = peg-like seta of the enlarged claw; t = protarsomere 5. Scale bar 0.1 mm for 7, 0.2 mm for 8.