Pyotr Petrov - Academia.edu (original) (raw)

Papers by Pyotr Petrov

Botanica Pacifica, Dec 31, 2022

Tijdschrift voor Entomologie, 2006

The species assigned to the so-called ruficollis group are placed in the subgenus Haliplus s.str,... more The species assigned to the so-called ruficollis group are placed in the subgenus Haliplus s.str, because Dytiscus impressus Fabricius, 1787 [a junior objective synonym of Haliplus ruficollis (De Geer, 1774)] is here selected as type species for the genus Haliplus Latreille, following Holmen (1987). By this action the subgenus Haliplinus Guignot, 1939, previously often applied to the ruficollis group, has become a junior synonym of Haliplus. It may be

Caucasian Entomological Bulletin, 2013

Резюме. Приводятся новые данные о ранее не известных или в отдельных случаях известных, но особо ... more Резюме. Приводятся новые данные о ранее не известных или в отдельных случаях известных, но особо интересных в Московской области видах жесткокрылых. Всего указывается 106 видов из 29 семейств, 100 из которых впервые отмечаются для региона. Ряд видов не регистрировался ранее в средней полосе европейской части России, а отдельные представители-и на территории России в целом.

Russian entomological journal, 2006

On the identity of Agabus uliginosus (Linnaeus, 1761), with the description of a new species of A... more On the identity of Agabus uliginosus (Linnaeus, 1761), with the description of a new species of Agabus from Russia (Coleoptera: Dytiscidae).

Zoosystematica Rossica, 2007

A diagnosis of Haliplus zacharenkoi Gramma in Gramma & Prisny, 1973 is given. The specimen labell... more A diagnosis of Haliplus zacharenkoi Gramma in Gramma & Prisny, 1973 is given. The specimen labelled as holotype by the authors was collected in a locality different from that mentioned in the original description. Therefore, the lectotype is designated and the paralectotypes examined are listed. The ecology and phenology of the species are discussed, its distribution is reviewed.

rej, 2011

ãðóïïû äî ðàáîòû Íèëüññîíà [Nilsson, 2000] îòíîñèëè ê ðîäó Agabus Leach, 1817. Òàáëèöà äëÿ îïðåäå... more ãðóïïû äî ðàáîòû Íèëüññîíà [Nilsson, 2000] îòíîñèëè ê ðîäó Agabus Leach, 1817. Òàáëèöà äëÿ îïðåäåëåíèÿ âèäîâ ãðóïï I. chalconatus è I. erichsoni ïî ñàìöàì [Fery & Nilsson, 1993] ÷àñòè÷íî âèäîèçìåíåíà äëÿ âêëþ÷åíèÿ â íåå íîâîãî âèäà.

The efficiency of funnel traps made of plastic bottles for collecting diving beetles (Coleoptera:... more The efficiency of funnel traps made of plastic bottles for collecting diving beetles (Coleoptera: Dytiscidae) was studied quantitatively using different types and amounts of bait in a small freshwater lake in Tver Oblast, European Russia. The efficiency of traps with bait was significantly higher than that of empty traps. Of the two studied types of bait, tinned stewed beef and frozen beef liver, neither proved more efficient when about 10 ml of bait were used. A greater amount of bait (20 ml, compared to 10 ml) did not increase the efficiency of the traps. The minimal effective amount of bait has been found to fall within the interval from 5 to 10 ml.

Supporting data for the article "Novel flight style and light wings boost flight performance... more Supporting data for the article "Novel flight style and light wings boost flight performance of tiny beetles" by S. E. Farisenkov, D. Kolomenskiy, P. N. Petrov, T. Engels, N. A. Lapina, F.-O. Lehmann, R. Onishi, H. Liu & A. A. Polilov. https://doi.org/10.1038/s41586-021-04303-7 (doi link to be activated)

Cretodytes Ponomarenko, 1977 Type species: Cretody... more Cretodytes Ponomarenko, 1977 Type species: Cretodytes latipes Ponomarenko, 1977. Notes: The genus is characterized by the short lateral lobe of the metaventrite, deep and rather wide cavity at the apex of the anterior metaventral process, and elevated median platforms of metacoxae, which are weakly diverging, but dilated and rounded apically. It differs from Palaeodytes in the longest point of the metacoxal plate situated at the level of the external margin of mesocoxae, and in the shorter lateral lobe of the metaventrite (which also distinguishes it from Liadytiscinae); from " Palaeodytes " incompletus it differs in the shape of the lateral lobe of the metaventrite and shape of the metacoxal processes; and from Sinoporus, in the concave posterior margins of the lateral lobes of the metaventrite (cf. Figs 20 and 23). The new species belongs to this genus according to the combination of two characters: metacoxal plate three times as long as the lateral lobe of the metaventrite and absence of a laterally limited elevated median area of the metaventrite.

Palaeodytes Ponomarenko, 1987 Type species: Palaeo... more Palaeodytes Ponomarenko, 1987 Type species: Palaeodytes sibiricus Ponomarenko, 1987. Notes: The genus is characterized by a short band-like pronotum and short head, together about 1 / 3 as long as the elytra; metacoxal plates longest in their lateral third (lateral of the external margins of the mesocoxae); lateral lobe of metaventrite half as long as metacoxal plate, median platforms of mesocoxae separated from the anterior margins of mesocoxae by a line, rounded apically and notched laterally; and dilated and flattened metatibia and metatarsus, the latter longer than the former. It differs from members of the subfamily Liadytiscinae in the shorter lateral lobe of the metaventrite, shorter and more dilated metatibia and metatarsus, and short pronotum; from Sinoporus it differs in the metaventrite with concave posterior margins of the lateral lobe (cf. Figs 17 and 23). The new species described below belongs to this genus according to the combination of two characters: metacoxa nearly twice as long as the lateral lobe of the metaventrite (LC/LV ≈ 2), and absence of an elevated laterally limited area of the metaventrite.

Mesodytes gen. n. Etymology: From the Mesozoic and the Gree... more Mesodytes gen. n. Etymology: From the Mesozoic and the Greek δύτη&sigmav; (diver); gender masculine. Type species: Mesodytes rhantoides sp. n. Diagnosis: Elytron smooth, translucent, covered with matted rows of dark spots, separated by a distance greater than or equal to their diameter. Lobe of prosternal process flat, elongated, reaching mesocoxae. Maximum length of lateral lobe of metaventrite relatively great, but smaller than maximum length of metacoxal plate (LC/LV> 1). Lateral lobe of metaventrite not reaching lateral margins of metepisternum and mesocoxal plate. Metaventrite without elevated laterally limited area medially. Metacoxal lines weakly diverging anteriad. Metacoxal processes rounded posteriorly, slightly narrowed anteriad. Metafemur 1.5 times as long as metatibia. Metafemur, when outstretched, reaching middle of abdominal ventrite 4. First metatarsomere 1.5 times as long as metatarsomere 2. Comparison: The new genus differs from the genus Mesoderus in the absence of an elevated laterally limited area of the metaventrite, translucent and dark-spotted elytron, and shorter metatibia and metatarsomere 1.

Mesoderus punctatus sp. n. Etymology: The Latin pu... more Mesoderus punctatus sp. n. Etymology: The Latin punctatus (spotted); adjective in the nominative singular. Material: Holotype NIGP 0 5622, counter impression of beetle; China, Liutiaogou; Early Cretaceous, Yixian Formation. Description (Figs. 8, 9): Light coloured beetle. Maximum body width situated at middle of abdominal ventrite 2. Elytron light, with dark spots, distance between spots twice as great as their diameter. Head length equal to width at posterior margin of eyes. Pronotum three times as wide as long, 1.6 times as wide basally as distally. Profemur narrowed towards apex; protarsal claws equal in length. Mesocoxae slightly separated. Mesofemur with anterior margin straight and posterior margin convex, slightly protruding beyond sides of body; mesotibia straight, with setose anterior margin. Metacoxal plate 1.2 times as long as lateral lobe of metaventrite (LC/LV = 1.2). Metafemur dilated towards apex. Metatibia straight, slightly shorter than metafemur, with swimming setae. Metatarsomere 1 with swimming setae, equal in length to metatarsomere 2; metatarsomere 2 equal in length to metatarsomeres 3 and 4 together; metatarsomere 5 short, only half as long as metatarsomere 4; claws of metatarsus equal in length, twice as long as metatarsomere 5. Penis pointed and curved (see arrow in Fig. 10). Measurements: Body length, 14.6 mm; body width, 7.5 mm; elytron length, 10.5 mm. Comparison: Similar to M. magnus Prokin & Ren, 2010 in size and in the pointed and curved penis, but differs from it in the dorsal coloration, LC/LV, longer metacoxal processes, shape of meso- and metafemora, and shorter metatarsomere 1.

Liadytes aspidytoides sp. n. Etymology: From the generic na... more Liadytes aspidytoides sp. n. Etymology: From the generic name Aspidytes; adjective in the nominative singular. Material: Holotype PIN 2470 / 942 ±, beetle without head, prothorax and legs; Shar Teg, Upper Jurassic, beds 441, layer 4; paratype 2470 / 945, less complete impression of beetle from the same locality, beds 451 / 3; additional specimen (cannot be identified with certainty, therefore not included in the type series) PIN 2470 / 938, isolated elytron from the same locality, beds 451 / 3. Description (Figs. 1–5): Beetle with dark elytra, which appear black due to carbonisation of organic substance in oxygen-free environment, and pale body. Maximum body width situated at level of elytral base. Mesocoxae only slightly separated, rounded. Maximum length of metaxocal plate (measured parallel to longitudinal body axis) 1.2 times as great as maximum length of lateral lobe of metaventrite (measured in same manner) 3. Anterior margin of metacoxa weakly convex (metacoxal plate dilated anteriorly). Elevated median part of metacoxae with sides more or less straight, slightly diverging posteriad; metacoxal processes rounded posteriorly, with posterior margins meeting at an obtuse angle. Transverse suture of metaventrite present; median part of metacoxae elevated. Metepisternum 1.3 times as long as wide. Abdomen tapering from base of ventrite 4; ventrite 6 twice as long as ventrite 5. Elytron 3.4 times as long as wide. Epipleuron wide in its basal third, twice as wide as distally. Surface microsculpture of underside punctate, laterally on abdominal ventrites imbricate (according to Harris 1979). Measurements: Body length, probably around 7 mm; body width, 3.1–3.7 mm; elytron length, 4.6–5.3 mm. Comparison: The new species is similar to L. crassus Ponomarenko, 1977 in the convex anterior margins of the metacoxae (dilated anteriorly), but differs from it, as well as from the other species of Liadytes, in the presence of the elevated median part of the metacoxa [...]

Key to the genera of Mesozoic Dytiscidae (adults) 1. Metaventrite with straight posterior margins... more Key to the genera of Mesozoic Dytiscidae (adults) 1. Metaventrite with straight posterior margins of lateral lobes, converging posteriad at obtuse angle (Fig. 23); elytra with dark stripes (subfamily incertae sedis).................................................................. Sinoporus. - Metaventrite with concave posterior margins of lateral lobes (e.g., as in Fig. 20); elytra without dark stripes............. 2. 2. LC/LV (ratio of maximum length of metacoxal plate and lateral lobe of metaventrite, both measured longitudinally, as in Fig. 22) around 1–1.7 (Liadytiscinae).......................................................................... 5 - LC/LV around 2 or greater (subfamily incertae sedis).......................................................... 3 3. Posterior and anterior margins of lateral lobe of metaventrite strongly converging, then slightly diverging again, then converging again near epipleuron; LC/LV around 3...................................

" Palaeodytes " incompletus Ponomarenko, Coram &a... more " Palaeodytes " incompletus Ponomarenko, Coram & Jarzembowski, 2005 This species was recently described from the Berriasian Purbek Limestone Group, UK. Its body outline is uncharacteristic of Palaeodytes (cf. fig. 4 in Ponomarenko et al. 2005: 280) and its lateral lobe of the metaventrite has a peculiar shape (resembling, e.g., that of the recent dytiscid Ilybius fenestratus (Fabricius, 1781), although it may be distantly related), with the posterior and anterior margins strongly converging and then slightly diverging again, and converging again near the epipleuron. The genus to which the species belongs is similar in morphological parameters to several recent genera of the family, and it is difficult to provide a diagnosis based on what is known about it. Having at present no opportunity to re-examine the holotype of this species in search of possible distinguishing characters of the genus, we refrain from describing the new genus here. Therefore, in this study the species is provisionally referred to hereinafter as " Palaeodytes " incompletus.

Liadyxianus kirejtshuki sp. n. Etymology: In honour of the ... more Liadyxianus kirejtshuki sp. n. Etymology: In honour of the coleopterist A.G. Kirejtshuk; noun in the genitive case. Material: Holotype MNHN A 31864, counter impression of beetle; China, probably Huanbanjigou (label indicates only formation); Early Cretaceous, Yixian Formation. Description (Figs. 6, 7): Light coloured beetle. Head triangular, 1.5 times as wide as long. Pronotum 3.6 times as wide as long, with posterolateral angles rounded. Maximum body width situated at level of abdominal ventrite 1. Mesocoxae located close to each other. Mesofemur not dilated basally. Maximum length of metacoxal plate 0.9 times as great as maximum length of lateral lobe of metaventrite (LC/LV = 0.9). Metacoxal processes more or less conjointly truncate, with posterior margins appearing somewhat sinuate, reaching posterior margin of abdominal ventrite 1. Metafemur with sides slightly rounded. Metatibia slightly dilated towards its apex, slightly longer than metafemur; metatarsomere 1 somewhat shorter than metatarsomeres 2 and 3. Abdominal tergite 4 with round spiracle dorsally. Measurements: Body length, 7.4 mm; body width, 3.7 mm; elytron length, 5.9 mm.