Aggerbille havai Legalov et Perkovsky, 2024

Aggerbille havai Legalov et Perkovsky , sp. nov.

https://zoobank.org/ urn:lsid:zoobank.org:act:DB5FECF5-689D-4AF4-A7EC-6ED07A8CFE92

( Figs 1-4 View Figure 1 View Figure 2 View Figure 3 View Figure 4 )

Type material. Holotype: DK-590, male, Agger on the west coast of Jutland, northwest Zealand ( Denmark), amber piece subtriangular, 14.7x12.5x 4.4 mm, with label ‘NHMD-625126 Biphyllidae Agger Denmark, Region Nordjulland, Thisted Kommune. Leg. Kristensen, Niels. Det. Solodovnikov, Alexey. 12-2009’, Danish amber, late Eocene.

Etymology. The epithet of this new species is dedicated to J. Háva (Prague, Czech Republic) who studied and catalogued Mycetophagidae .

Description. Body black, oblong-oval, moderately convex dorsally, covered with dark, long, decumbent setae. Head rectangular, distinctly narrower than greatest pronotal width, sparsely punctate. Forehead flat, wide. Eyes well protruded, coarsely faceted. Antennae feebly clavate, slightly reaching hind angles of pronotum. Antennomeres one to eight elongate-conical. First antennomere about 1.9 times as long as wide at apex. Second antennomere about 2 times as long as wide at apex, of same length and 0.8 times as narrow as antennomere one. Third antennomere about 2.5 times as long as wide at apex, about 1.25 times as long as antennomere two. Fourth antennomere about 2.8 times as long as wide at apex, about 0.95 times as long as antennomere three. Fifth antennomere 1.2 times as long as fourth. Antennomeres six and seven equal in length and width, 0.8 as long as antennomere five. Eighth antennomere about 2.3 times as long as wide at apex, about 0.9 times as long as antennomere seven. Antennal club consists of antennomeres nine to eleven. Ninth antennomere about 2.5 times as long as wide at apex, about 1.4 times as wide as antennomere eight. Tenth antennomere about 2.2 times as long as wide at apex, of same length and about 1.3 times as wide as antennomere nine. Eleventh antennomere about 2.7 times as long as wide at base, about 1.2 times as long as and of same width as antennomere ten. Pronotum almost trapezoid, about same length as width across apex, about 0.7 times as long as wide across middle and about 0.55 times as long as wide across base. All margins distinctly and narrowly bordered. Lateral margins weakly arcuate. Disc densely punctate. Scutellum pentagonal, about 0.7 times as long as wide. Elytra oval, widest at proximal third, about 1.6 times as long as maximum width, about 2.1 times as long as wide across apical fourth, about 3.0 times as long as pronotum, with indistinct humeri. Elytral striae indistinct. Metaventrite weakly convex, about 0.9 times as long as length of mesocoxal cavity, sparsely punctate. Metepisternum about 2.1 times as long as its median width, sparsely punctate. Abdomen convex. First ventrite about 1.1 times as long as metacoxal cavity. Second ventrite about 0.65 times as long as first ventrite. Third ventrite about 0.8 times as long as ventrite two. Fourth ventrite 0.8 times as long as third ventrite. Fifth ventrite about 0.9 times as long as fourth ventrite. Legs long. Metacoxa more than two times as long as wide. Femora clavate. Tibiae long, distinctly curved. Tarsi long. Body length: 2.1 mm.

Discussion

Half of the Hymenoptera genera in Danish amber ( Viertler et al. 2023; Simutnik & Perkovsky 2023; Belokobylskij et al. 2024a, 2024b; Simutnik et al. 2024) are unknown in Baltic amber. The difference between the Baltic amber fauna and those of other European ambers appears mainly due to its lower presence of cryophobic insects, and/or those not directly associated with the amber forest ( Legalov et al. 2024), For example, there are 46 named species of caddisflies from Rovno amber, 74% of which are unknown from Baltic amber ( Melnitsky et al. 2024a, 2024b, 2024c). The proportion of beetles not directly associated with the amber forest in the Danish assemblage is not very large according to our data, and the fauna of Danish amber in terms of the number of known specimens is significantly smaller than all other European amber faunas, so that only a small part of the Danish endemics may have ended up in the amber trap. At the same time, revisions of seven subfamilies of five families, Apioninae of the Brentidae ( Voss 1972; Legalov 2020, 2022), Molytinae , Cossoninae and Entiminae of the Curculionidae ( Voss 1972; Legalov 2020), Galerucinae of the Chrysomelidae ( Nadein et al. 2016) , Pharaxonothinae of the Erotylidae ( Lyubarsky et al. 2024a) and Cryptophaginae of the Cryptophagidae ( Lyubarsky et al. 2024b, 2024c) allowed us to identify four genera, one subgenus and ten species unknown from Baltic amber. An additional genus and three species from Danish amber were added after revision of the subfamily Omaliinae ( Staphylinidae ) from European amber ( Shavrin et al. 2023 and references therein). It is therefore quite notable that the specimen described in this paper was designated Danekrae already in 2009 (another amber Danekrae were discussed this year in Anisyutkin et al. 2024 [DK 176] and Rasmussen et al. 2024 [DK 1073]).

Acknowledgements

We thank Lars Vilhelmsen ( NHMD) for the loan of the specimen, S. Bruce Archibald ( University of British Columbia, Canada) for editing the English and useful comments and anonymous reviewers for improving the overall quality of the manuscript. EEP’s research was supported by a “Support and development of the amber collection of the Statens Naturhistoriske Museum (continuation)” grant from Dr. Bøje Benzons Støttefond .

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