Atomaria Stephens, 1829

Lyubarsky, Georgy Yu., Legalov, Andrei A., Vasilenko, Dmitry. V. & Perkovsky, Evgeny E., 2024, Two new silken fungus beetle species (Coleoptera, Cucujiformia, Cryptophagidae) from Rovno amber, Ecologica Montenegrina 73, pp. 90-99 : 91-96

publication ID	https://doi.org/ 10.37828/em.2024.73.9
publication LSID	urn:lsid:zoobank.org:pub:274177B1-5794-4325-975E-984A610C12C7
persistent identifier	https://treatment.plazi.org/id/038987D7-FFA2-7A56-FF52-19CEFA94B29A
treatment provided by	Felipe
scientific name	Atomaria Stephens, 1829
status

Treatment

Genus Atomaria Stephens, 1829 View in CoL

Тype species: Dermestes nigripennis Paykull, 1798

Subgenus Anchicera Thomson, 1863

Atomaria (Anchicera) bukejsi Lyubarsky et Perkovsky , sp. nov.

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( Figs. 1 View Figure 1 , 2A View Figure 2 )

Type material. Holotype. SIZK CC-21 , Stare Selo , Rovno amber, late Eocene.

Syninclusions: SIZK CC- 17: a worker of Lasius schiefferdeckeri Mayr, 1868 , a larva of an indet. Coleoptera ; SIZK CC- 18– SIZK CC- 20: three specimens of the same species of Corticariinae ( Latridiidae ); stellate hairs.

Etymology. Patronymic. Named for our dear colleague Dr. Andris Bukejs (Institute of Life Sciences and Technologies, Daugavpils University, Daugavpils, Latvia).

Differential diagnosis. Atomaria bukejsi sp. nov. appears similar to A. gedanicola Lyubarsky et Perkovsky (2013) , but differs from it due to the convex pronotal disc ( A. gedanicola : pronotal disc flat), the pronotum with a maximum width afore midlength ( A. gedanicola : behind midlength), the depressed pronotal base ( A. gedanicola : base of pronotum without depression), antennomeres 3, 5, and 7 subquadrate ( A. gedanicola : elongate), and more transverse pronotum, about 1.68 times as wide as long ( A. gedanicola : about 1.44 times as wide as long).

Description. Measurements: body length (from anterior margin of head to elytral apex along midline) about 1.65 mm, body maximum width across both elytra 0.76, pronotum length 0.36, pronotum maximum width 0.64, elytra length 1.1, elytra maximum width 0.76. Body elongate ( Figs 1A, 1B View Figure 1 ), moderately convex, covered with slightly curved, semierect, moderately long, pale setation. Body, legs and antennae unicolorous dark brown. Head transverse, finely punctate, with hemispherical, coarse faceted eyes. Eye well developed, with nine facets in lateral eye margin (counted in dorsal view at maximum eye length). Antennae long, slender, with club extending beyond base of pronotum ( Figs 1A, 1D View Figure 1 ). Antennal shape as in Figures 1A and 1C View Figure 1 ; antennomeres 1–3 elongated, about 1.5 times as long as wide, antennomeres 4–8 short, about 1.0–1.2 times as long as wide, antennomere 9 slightly transverse, antennomere 10 subquadrate, terminal antennomere obliquely oval. Antennal insertions widely separated basally. Pronotum strongly transverse, widest at or just behind midlength where it about 1.68 times as wide as long, strongly narrowed anteriorly and slightly - posteriorly. Anterior margin non-sinuate and not notched, anterolateral angles without thickening or callosity. Lateral margins only visible from above in basal half of pronotum. Pronotal disc convex, moderately strongly and densely punctate, distance between punctures 1× diameter of one puncture. Base of the pronotum without median depression ( Fig. 1D View Figure 1 ); posterolateral angles rectangular. Posterior margin finely edged, basal margin slightly bilobed. Pronotum rather wide, not narrower than elytra. Prosternum strongly and densely punctured. Scutellar shield small, oval, transverse, more than twice wider than long. Elytra elongate oval, moderately convex, weakly curved at lateral margins, widest about at anterior one-third, 3.2 times as long as pronotum, 1.5 times as long as combined wide. Elytral surface moderately densely, confusedly punctate, punctures in basal part of elytra slightly smaller compared to those on pronotal disc, and separated by about 1.0–1.5 their diameters; elytral humeri rounded, not toothed. Epipleura narrowed posteriorly, incomplete, extending about to abdominal ventrite 4. Longitudinal metasternal line absent. Legs slender, long, relatively similar in shape, finely punctate. Procoxae large, widely suboval, slightly transverse; mesocoxae round; metacoxae narrowly oval, strongly transverse. Femora elongate-oval, flattened. Tibiae thin, almost straight, parallel-sided, nearly as long as femora, with two terminal spurs ( Fig. 2A View Figure 2 ). Tarsi long and thin; tarsomeres simple, not lobed; tarsal formula 5-5-5 ( Fig. 2A View Figure 2 ). Pretarsal claws simple. Abdomen with five visible, freely articulated ventrites; ventrite 1 longest, covered with rather coarse punctation, ventrites 2–5 with fine and denser punctures; ventrite 5 evenly arcuate; ventrite 5 without crenulations, surface unmodified.

Remarks. According to our observations, ants of the genus Lasius Fabricius and beetles of the family Latridiidae are quite often found together with Cryptophagus . Cryptophagus is lacking special connections with Lasius ants. According to our data, combined findings of the following species were noted: Cryptophagus cellaris Scopoli , C. dorsalis C.R. Sahlberg , C. falcozi Roubal , C. fuscicornis Sturm , C. intermedius Bruce , C. lycoperdi (Scopoli) , and C. quercinus Kraatz. Most of these species are widespread (across a large part of the Palaearctic) and quite common. Cryptophagus cellaris , for instance, besides to Lasius nests was found in underground nests of mice and other mammals, at basements of various buildings, in the meadows, in a mill and wheat warehouses, in rotten straw, in a bee hive, and under spruce bark. Cryptophagus dorsalis was found under pine bark, on birch sap, and in forest litter. Cryptophagus lycoperdi was found in bee hives, bumblebee nests, on fungi, and in forest litter. Co-occurrence with latridiids most likely point on sharing same habitat in litter, most likely - forest litter. As far as is known, Lasius ants do not occur together with Atomaria . Perhaps this accidental colocation can be explained by Atomaria and Lasius occurrence together in Eocene, for instance, in forest litter.

Atomaria (Anchicera) archibaldi Lyubarsky et Perkovsky , sp. nov.

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( Figs 2B View Figure 2 , 3 View Figure 3 )

Type material. Holotype. SIZK L-425, Voronki , Rovno amber, late Eocene.

Syninclusion: SIZK L-426: Collembola Entomobryomorpha.

Etymology. Patronymic. Named for our dear colleague Dr. S. Bruce Archibald (University of British Columbia, Vancouver, Canada).

Differential diagnosis. Atomaria archibaldi sp. nov. appears similar to A. telnovi Lyubarsky et Perkovsky , but is specifically different from it in the pronotum widest at base ( A. telnovi : widest at midlength), the pronotal base without median depression ( A. telnovi : base of pronotum with strong median depression), the antennomere 5 longer than antennomere 3 ( A. telnovi : same length), the antennomere 7 elongate, longer than antennomere 8 ( A. telnovi : same lenght), and the antennomeres 9– 10 strongly transverse, 1.3–1.4× as wide as long ( A. telnovi : antennomeres 9–10 slightly transverse).

Description. Body length 1.31 mm; body elongate (fig. 2B), moderately convex, covered with slightly curved, semierect pale moderately long setation. Body and antennae unicolorous dark brown, legs paler, reddish brown. Head transverse, finely punctured, with hemispherical, coarsely faceted eyes. Eye well developed. Antennae 11-segmented with 3-segmented loose club, short, slender, club not extending beyond base of pronotum ( Figs 2B View Figure 2 , 3B View Figure 3 ). Antennal shape as in Figures 2B View Figure 2 and 3B View Figure 3 , antennomere 1 subcylindrical, elongate, 1.3× as long as wide; antennomere 2 slightly elongate, 1.1× as long as wide; antennomere 3 conical, elongate, about 1.3× as long as wide, distinctly narrower and slightly shorter than antennomere 2; antennomere 4 slightly elongate, 1.1× as long as wide; antennomere 5 conical, elongate, 1.4× as long as wide, longer than antennomere 3; antennomere 6 slightly elongate, 1.1× as long as wide; antennomere 7 conical, elongate, 1.4× as long as wide, longer than antennomere 8; antennomere 8 subquadrate, nearly as long as wide; antennomeres 9–10 trapezoid, strongly transverse, 1.3–1.4× as wide as long; antennomere 11 widely oval, with rounded apex, 1.3× as long as wide. Pronotum transverse, 0.54 times as wide as long, widest at base, strongly narrowed anteriorly. Anterior margin non-sinuate, without notch; anterolateral angles without thickening or callosity. Lateral margin only visible from above in basal half of pronotum. Pronotal disc slightly convex, moderately strongly and moderately densely punctate, distance between punctures 1× diameter of one puncture. Base of pronotum without median depression (fig. 3A); posterolateral angles rectangular. Pronotum relatively wide, not narrower than elytra at base. Prosternum strongly and densely punctured. Elytra elongate oval, moderately convex, slightly rounded at lateral margins, widest about in anterior one-third, 2.7 times as long as pronotum, 1.54 times as long as combined wide. Elytral surface moderately densely, confusedly punctate, punctures in basal part slightly smaller than those on pronotal disc, and distance between punctures 1.0-1.5× diameter of one puncture; elytral humeri rounded, not toothed. Longitudinal metasternal line absent. Legs slender, long, relatively similar in shape, finely punctate. Procoxae large, widely suboval, slightly transverse; mesocoxae round; metacoxae narrowly oval, strongly transverse. Femora elongate-oval, flattened. Tibiae thin, almost straight, parallel-sided, nearly as long as femora, with two terminal spurs ( Fig. 2B View Figure 2 ). Tarsi long and thin; tarsomeres simple, not lobed; tarsal formula 5- 5-5 ( Fig. 2B View Figure 2 ). Pretarsal claws simple. Abdomen with five visible, freely articulated ventrites; ventrite 1 longest, covered with rather coarse punctation, ventrites 2–5 with fine and denser punctures; ventrite 5 evenly arcuate; ventrite 5 without crenulations, surface unmodified.