Rovnodryinus khomychi Olmi & Guglielmino & Vasilenko & Perkovsky 2022, sp. nov.
Creators: name: Olmi, Massimo
name: Guglielmino, Adalgisa
name: Vasilenko, Dmitry V.
name: Perkovsky, Evgeny E.
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Dryinidae
Rovnodryinus
Rovnodryinus khomychi

description: † Rovnodryinus khomychi sp. nov.
(Figs 1, 2, 3A, 3B, 4A)
Material examined: Female holotype number L-905 (deposited in SIZK). Specimen in Upper Eocene Rovno amber, collected in Varash district, Rovno region. Horizon: Priabonian (35–38 Ma).
Diagnosis. See above tribe diagnosis.
Etymology: the new species is named after the owner of the amber piece, Mr. Nikolai R. Khomych.
Description of female. Apterous (Figs 1A, B); length 3.7 mm. Head black; antenna brown; mesosoma black; metasoma black-brown; legs brown. Dorsal surface of head, body and legs covered by white milk-like substance (Fig. 1B). Antenna composed of 10 antennomeres (Fig. 2A), filiform, much shorter than head + mesosoma + metasoma (44:62), posteriorly reaching second segment of metasoma; antennomeres apparently covered with short setae; ADOs (Figs 2B, D) present in antennomeres 3–10 (= flagellomeres 1–8); antennomeres in following proportions: 20:8:15:14:14:11:10:9:9:11; antenna long, more than twice as long as head: 44:27. Head hypognathous (Figs 1D, 2C), with sculpture of face and vertex not distinct, because covered with milk-like substance; mandible and clypeus not distinct; occipital carina complete (Figs 1A, C, D); temple prominent, very long, much longer than eye (10:8) (Figs 1D, 2C); eye normally bulging, apparently unsetose; anterior half of face with two lateral ocelli situated between eyes (Figs 1B, C, D) and very far from the occipital carina; median ocellus absent; OPL much longer than TL (19:10). Palpal formula 6/3. Mesosoma much longer than head (50:27), much shorter than metasoma (50:80), almost completely composed of fused segments (Figs 1A, 2C); in mesosoma, only propleuron mobile and articulated with rest of mesosoma (Figs 1A, 1D, 2C). Dorsal surface of mesosoma not visible, because covered with milklike substance. Apparent pronotum (Fig. 1B) distinct, though covered with milk-like substance, because separated from rest of mesosoma by transverse furrow dorsally easily visible among milk-like substance (Fig. 1B), laterally distinct, because not covered with milk-like substance (Figs 1A, 2C). Lateral surface of mesosoma (mesopleuron + metapleuron) covered with dense setae, with sculpture not distinct. Mesoscutum, mesoscutellum, metanotum, disc of metapectal-propodeal complex and propodeal declivity not visible. Apparent metapectal-propodeal complex densely setose, visible only laterally. Proleg podomeres in following proportions: 19 (coxa): 15 (trochanter): 38 (femur): 41 (tibia): 22 (first tarsomere): 4 (second tarsomere): 5 (third tarsomere): 13 (fourth tarsomere): 20 (fifth tarsomere). Protarsus chelate (Fig. 3A). Rudimentary claw present (Figs 3B, 4A). Chela (Figs 3B, 4A) composed of normal enlarged claw + protarsomere 5. Enlarged claw (Figs 3B, 4A) slightly shorter than protarsomere 5 (17:20), with long row of setae on outer side and long row of lamellae on inner side, number of lamellae indistinct. Protarsomere 5 (Figs 3B, 4A) apparently with two rows of lamellae, shorter row composed of about six long lamellae; longer row composed of indistinct number of lamellae. Protrochanter much longer than maximum width (15:5), with slender proximal stalk, broadened distally (Fig. 2C). Protarsomere 3 produced into hook. Arolium about as long as rudimentary claw (Figs 3B, 4A). Mesoleg podomeres in following proportions: 13 (coxa): 7 (trochanter): 38 (femur): 42 (tibia): 24 (first tarsomere): 8 (second tarsomere): 7 (third tarsomere): 4 (fourth tarsomere): 7 (fifth tarsomere). Metaleg podomeres in following proportions: 15 (coxa): 10 (trochanter): 58 (femur): 64 (tibia): 30 (first tarsomere): 13 (second tarsomere): 10 (third tarsomere): 6 (fourth tarsomere): 8 (fifth tarsomere). Petiole not visible. Tibial spurs 1/0/2.
Male. Unknown.
Remarks. Because of the peculiar morphologic characters indicated in the above diagnosis, the tribe Rovnodryinini trib. nov. can be included in the subfamily Apodryininae. The keys to the subfamilies and tribes of Dryinidae females presented by Olmi 1984, 1987, Olmi & Guglielmino 2010 and Olmi et al. 2020 can be modified by replacing the first six couplets as follows:
1 Protarsus not chelate (Fig. 13 in Olmi 1984)................................................................ 2
- Protarsus chelate (Fig. 3A; Fig. 16 in Olmi 1984)............................................................ 4
2 Pterostigma less broad, more than three times as long as broad (Fig. 3A in Olmi et al. 2020); forewing with three basal cells (costal, radial and first cubital) enclosed by pigmented veins (Fig. 3A in Olmi et al. 2020).................................................... 17. Archaeodryininae Olmi, Perkovsky, Martynova, Contarini, Bückle & Guglielmino (extinct)
- Pterostigma broader, less than three times as long as broad (Figs 3 B-D in Olmi et al. 2020); forewing with one (costal) or two (costal and radial) basal cells enclosed by pigmented veins (Figs 3 B-D in Olmi et al. 2020)........................... 3
3 Head hypognathous (Fig. 7 in Olmi & Guglielmino 2010); face and part of clypeus without strong median raised carina (Fig. 5 in Olmi & Guglielmino 2010), with or without normal frontal line............................ 1. Aphelopinae Perkins
- Head prognathous (Fig. 2 in Olmi & Guglielmino 2010); face and part of clypeus with one strong median raised carina (Fig. 1 in Olmi & Guglielmino 2010)............................................... 2. Erwiniinae Olmi & Guglielmino
4 Ocelli absent (Figs 3C, 5A; Fig. 15 in Olmi 1984); ADOs present in antennomeres 3–10 or 4–10...................... 5
- Ocelli present (Figs 1B, C, D; Fig. 662 in Olmi 1984) ADOs absent or present in antennomeres 3–10 or 5–10, 6–10, 7–10, 8–10 or 9–10............................................................................................. 6
5 Mesosoma almost completely composed of fused segments (Figs 3C, 3D, 5A, 5B); prothorax fused with mesothorax; in mesosoma, only propleuron mobile and articulated with other segments of mesosoma...................................................................................... 11. Apodryininae Olmi, Tribe Apodryinini trib. nov. (extant)
- Mesosoma partly composed of fused segments (Figs 3, 4 in Olmi 1987); entire prothorax mobile, articulated with rest of mesosoma........................................................................... 12. Plesiodryininae Olmi
6 Mesosoma almost completely composed of fused segments (Figs 1A, 2C); prothorax fused with mesothorax; in mesosoma, only propleuron mobile and articulated with other segments of mesosoma; head with ocelli situated in the anterior half of the face (Figs 1B, C, D); ADOs present in antennomeres 3–10..................................................................................................... 11. Apodryininae Olmi, Tribe Rovnodryinini trib. nov. (extinct)
- Mesosoma not composed of fused segments; head with ocelli situated in the posterior half of the face (Fig. 5C); ADOs absent, or present in antennomeres 5–10, 6–10, 7–10, 8–10 or 9–10................................................... 7
7 Chela without rudimentary claw (Fig. 314 in Olmi 1984)...................................................... 8
- Chela with rudimentary claw (Fig. 1223 in Olmi 1984)...................................................... 10
In the above key, the new tribe Rovnodryinini is distinct from the nominal tribe Apodryinini because of the presence of the ocelli (absent in Apodryinini). Following the description of Rovnodryinini and the rules of the International Code of Zoological Nomenclature, the new tribe Apodryinini can be described as follows:
description: Published as part of Olmi, Massimo, Guglielmino, Adalgisa, Vasilenko, Dmitry V. & Perkovsky, Evgeny E., 2022, Discovery of the first apterous pincer wasp from amber, with description of a new tribe, genus and species of Apodryininae (Hymenoptera, Dryinidae), pp. 54-66 in Zootaxa 5162 (1) on pages 57-59, DOI: 10.11646/zootaxa.5162.1.3, http://zenodo.org/record/6796773