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Koji Sasakawa - One of the best experts on this subject based on the ideXlab platform.
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a new species of ground beetle and a revised list of the east asian endemic subgenus nialoe s lat coleoptera carabidae Pterostichus
Oriental Insects, 2021Co-Authors: Koji SasakawaAbstract:The taxonomy of the East Asian endemic subgenus Nialoe (s. lat.) Tanaka, 1958 (Coleoptera: Carabidae: Pterostichus) is still insufficient at both the specific and subgeneric levels, and the discove...
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taxonomic and nomenclatural changes in three species of Pterostichus bonelli coleoptera carabidae from the far east
Zootaxa, 2020Co-Authors: Koji Sasakawa, Oleg Berlov, Yutaka OkuzakiAbstract:The ground beetle genus Pterostichus Bonelli has diversified in regions including the Far East, but taxonomic issues remain even at the species level. This study presents taxonomic and nomenclatural changes in three species of Pterostichus from the Far East: P. (Petrophilus) eximius Morawitz, P. (Lenapterus) wellschmiedi Kirschenhofer, and P. (L.) subrugosus Straneo. The analyses are based on comparative studies of the endophallus of male genitalia, which is taxonomically useful in Carabidae but has not been examined in these species. The first species, P. eximius, has been treated as a monotypic species that is widely distributed in Eastern Siberia, the Russian Far East, and adjacent regions, but our results revealed that populations from Rishiri-to and the Sakhalin islands are distinct from the nominotypical population from Transbaikalia. The name for the Sakhalin population, which was synonymized with P. eximius, is reinstated as subspecies P. eximius sachalinensis stat. nov., and the Rishiri-to population is described as Pterostichus eximius rishiridakensis ssp. nov. Conspecificity (syn. nov.) was confirmed for P. wellschmiedi, which was described from southern Sakhalin, and P. marginatus Matsumura, which was described earlier from southern Sakhalin. No conspicuous differences in the endophallus structure were found between P. subrugosus, which was described from Hokkaido, and P. marginatus, although differences are recognized in the elytral sculptures and in the metallic luster of the dorsal surface. The taxon was thus downgraded to subspecies P. marginatus subrugosus stat. nov.
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morphological phylogeny and biogeography of the Pterostichus raptor species group coleoptera carabidae of ground beetles endemic to the korean peninsula and adjacent islands
Journal of Asia-pacific Entomology, 2017Co-Authors: Koji Sasakawa, Junglark Kim, Jongkuk Kim, Kohei KubotaAbstract:Abstract To investigate the history of differentiation of the Pterostichus raptor species group of carabid beetles, endemic to the Korean Peninsula and adjacent islands, we performed cladistic analyses based on 30 adult morphological characters for all 12 species of the group and an outgroup species. The resultant tree revealed three monophyletic clades within the group, each of which is composed of 3–6 parapatric or allopatric species; the three clades occur sympatrically in most parts of the peninsula. Reconstructions of geographic range history on the obtained tree showed that the initial divergence of the three clades occurred in the Taebaek Mountains and that each clade subsequently dispersed southward and speciated after that dispersal.
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directional mitochondrial introgression and character displacement due to reproductive interference in two closely related Pterostichus ground beetle species
Journal of Evolutionary Biology, 2016Co-Authors: Shuhei Kosuda, Koji Sasakawa, Hiroshi IkedaAbstract:Reproductive interference due to interspecific hybridization can lead to character displacement among related species with overlapping ranges. However, no studies have examined which reproductive traits are most important in reducing reproductive interference. We conducted molecular analyses of two nuclear genes (28S and Wingless) and a mitochondrial gene (COI) from two closely related ground beetle species, Pterostichus thunbergi and Pterostichus habui (Coleoptera: Carabidae), with overlapping distributions. In addition, we examined four reproductive traits (body size, organ morphologies of intromittent and non-intromittent male genital organs, and female reproductive period) in sympatric and allopatric habitats. We compared male genital morphology using geometric morphometric analysis. The species determined by morphology were classified into separate groups based on the phylogenetic tree constructed by the nuclear gene (Wingless). However, according to the mitochondrial genes examined, P. thunbergi was not monophyletic, whereas at the sympatric sites, these species formed a monophyletic clade. This incongruence suggests that interspecific hybridization and subsequent mitochondrial introgression from P. habui to P. thunbergi have occurred. Concerning genital morphology, both of the intromittent and nonintromittent organs of P. thunbergi differed more from P. habui at the sympatric sites than between allopatric sites, suggesting reproductive character displacement. Pterostichus thunbergi, which likely arrived in P. habui habitat in small numbers, would have experienced stronger selection pressures than P. habui.
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notes on the ground beetle Pterostichus togyusanus coleoptera carabidae phylogenetic evidence for species status and new distribution record
Journal of Asia-pacific Entomology, 2013Co-Authors: Koji Sasakawa, Junglark Kim, Jongkuk Kim, Kohei KubotaAbstract:Abstract A flightless carabid beetle, Pterostichus bellatrix (Tschitscherine, 1895), which is endemic to the Korean Peninsula, had been thought to comprise two subspecies: the nominotypical subspecies distributed in northern and central parts of the peninsula, and the subspecies P. bellatrix togyusanus Park and Kwon, 1996 , distributed in the southern part of the peninsula. A recent study upgraded these two subspecies to species level, but no convincing evidence was provided for this taxonomic change. Our comparative morphology of external and male genital characters revealed that these two species are paraphyletic with respect to Pterostichus syleus Kirschenhofer, 1997 , which was described from Liaoning Province, China. Thus, separate species status of P. bellatrix and P. togyusanus was confirmed phylogenetically. Although P. togyusanus has only been known from the type locality, Mt. Deogyusan, we newly record this species from Mt. Jirisan, a mountain located south of the known locality. A revised key to species of the Pterostichus opacipennis species group (= the subgenus Koreonialoe (s. str.) Park and Kwon, 1996 ), which now includes 14 species, is also provided.
Kohei Kubota - One of the best experts on this subject based on the ideXlab platform.
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morphological phylogeny and biogeography of the Pterostichus raptor species group coleoptera carabidae of ground beetles endemic to the korean peninsula and adjacent islands
Journal of Asia-pacific Entomology, 2017Co-Authors: Koji Sasakawa, Junglark Kim, Jongkuk Kim, Kohei KubotaAbstract:Abstract To investigate the history of differentiation of the Pterostichus raptor species group of carabid beetles, endemic to the Korean Peninsula and adjacent islands, we performed cladistic analyses based on 30 adult morphological characters for all 12 species of the group and an outgroup species. The resultant tree revealed three monophyletic clades within the group, each of which is composed of 3–6 parapatric or allopatric species; the three clades occur sympatrically in most parts of the peninsula. Reconstructions of geographic range history on the obtained tree showed that the initial divergence of the three clades occurred in the Taebaek Mountains and that each clade subsequently dispersed southward and speciated after that dispersal.
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notes on the ground beetle Pterostichus togyusanus coleoptera carabidae phylogenetic evidence for species status and new distribution record
Journal of Asia-pacific Entomology, 2013Co-Authors: Koji Sasakawa, Junglark Kim, Jongkuk Kim, Kohei KubotaAbstract:Abstract A flightless carabid beetle, Pterostichus bellatrix (Tschitscherine, 1895), which is endemic to the Korean Peninsula, had been thought to comprise two subspecies: the nominotypical subspecies distributed in northern and central parts of the peninsula, and the subspecies P. bellatrix togyusanus Park and Kwon, 1996 , distributed in the southern part of the peninsula. A recent study upgraded these two subspecies to species level, but no convincing evidence was provided for this taxonomic change. Our comparative morphology of external and male genital characters revealed that these two species are paraphyletic with respect to Pterostichus syleus Kirschenhofer, 1997 , which was described from Liaoning Province, China. Thus, separate species status of P. bellatrix and P. togyusanus was confirmed phylogenetically. Although P. togyusanus has only been known from the type locality, Mt. Deogyusan, we newly record this species from Mt. Jirisan, a mountain located south of the known locality. A revised key to species of the Pterostichus opacipennis species group (= the subgenus Koreonialoe (s. str.) Park and Kwon, 1996 ), which now includes 14 species, is also provided.
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phylogeny of ground beetles subgenus nialoe s lat tanaka coleoptera carabidae genus Pterostichus a molecular phylogenetic approach
Entomological Science, 2009Co-Authors: Koji Sasakawa, Kohei KubotaAbstract:We constructed a phylogeny of the ground beetle subgenus Nialoe (s. lat.), genus Pterostichus (Coleoptera: Carabidae) based on two mitochondrial (cytochrome oxidase I and 16S ribosomal DNA) and one nuclear (28S ribosomal DNA) gene sequences. Thirty-three representative species of the group and three outgroup species were analyzed. The resultant trees (maximum parsimonious, maximum likelihood and Bayesian trees of the combined data of the three gene sequences) indicated that there are two large and three small lineages in the group, some of which were supported by a previous morphology-based phylogeny. In all the analyses, the small lineage composed of two Korean species is sister to the rest of the subgenus, but relationships of other four lineages differed among the analyses and remained unresolved. The implications of the present results are discussed in terms of taxonomy and biogeography of the group.
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taxonomic studies of Pterostichus ishikawai nemoto coleoptera carabidae
Entomological Science, 2008Co-Authors: Koji Sasakawa, Junglark Kim, Jongkuk Kim, Kohei KubotaAbstract:A macrocephalic pterostichine carabid, Pterostichus ishikawai Nemoto, endemic to the Korean Peninsula, is taxonomically revised based mainly on the membranous parts of the genitalia (male endophallus and female vagina). Two species are separated from P. ishikawai (type locality: Mount Taebaegsan) and newly described: P. ishikawaioides (type locality: Mount Sobaeksan) and P. jiricola (type locality: Mount Jirisan). Since comparative male genital morphology does not support monophyly for these three species, the two novel species should be treated as distinct species, not subspecies of P. ishikawai.
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phylogeny and genital evolution of carabid beetles in the genus Pterostichus and its allied genera coleoptera carabidae inferred from two nuclear gene sequences
Annals of The Entomological Society of America, 2007Co-Authors: Koji Sasakawa, Kohei KubotaAbstract:Abstract The phylogeny and genital evolution of carabid beetles in the tribe Pterostichini, mainly the genus Pterostichus (Coleoptera: Carabidae), were studied using two nuclear gene sequences: wingless and 28SrDNA. Phylogenetic results suggest that the genera Molops, Poecilus, Stomis, Myas, Lesticus, and Trigonotoma and the subgenus Bothriopterus of the genus Pterostichus form basal lineages, with genus Molops sister to the rest of the tribe. The genus Pterostichus, with the exception of the subgenus Bothriopterus, was monophyletic and occupied more derived lineages. Examinations of the membranous parts of the genitalia (male endophallus and female spermatheca) revealed that endophalli and spermathecae are classified into four and five types, respectively. Reconstructions of genital character evolution on the trees obtained suggest that the ancestor of Pterostichini had a straight endophallus and a short cylindrical spermatheca and that the elaborated genitalia seen in some species evolved in more derive...
Itô Hirotarô - One of the best experts on this subject based on the ideXlab platform.
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Figures 12-22 from: Sasakawa K, Itô H (2017) Two new species of the Pterostichus macrogenys species group (Coleoptera, Carabidae) discovered in shallow subterranean habitats in northern Honshu, Japan. Subterranean Biology 21: 47-56. https://doi.org/10.3897/subtbiol.21.11155
2017Co-Authors: Sasakawa Kôji, Itô HirotarôAbstract:Figures 12-22 - Male genitalia of species of the macrogenys species group. Left lateral view (12), right lateral view (13), left dorsolateral view (14), and right dorsolateral view (15) of endophallus of Pterostichus shinbodakensis sp. n., holotype. Dorsal view of apical part (16), left lateral view (17), and ventral view of apical part (18) of right paramete of Pterostichus shinbodakensis sp. n., holotype. Dorsal view of apical part (19) and left lateral view (20) of right paramete of Pterostichus falcispinus from the type locality. Left lateral view (21) and right lateral view (22) of endophallus of Pterostichus tateishiyamanus sp. n., holotype. go: gonopore; lal: left apical lobe; lpb: left pigmented band; lpl: left preapical lobe; rpl: right preapical lobe. Scale bar = 0.5 mm
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Figures 1-7 from: Sasakawa K, Itô H (2017) Two new species of the Pterostichus macrogenys species group (Coleoptera, Carabidae) discovered in shallow subterranean habitats in northern Honshu, Japan. Subterranean Biology 21: 47-56. https://doi.org/10.3897/subtbiol.21.11155
2017Co-Authors: Sasakawa Kôji, Itô HirotarôAbstract:Figures 1-7 - Design of subterranean baited traps and the aboveground and subterranean environments at the collection sites. 1 Trap without cover, showing sections containing attractant (larger container) and preservative (smaller container) 2 Trap with cover, showing the entrance section (square with broken lines) 3 Trap installed in hole, showing nylon cord, part of which will be left aboveground as a marker 4 Aboveground environment of the Pterostichus shinbodakensis type locality 5 Hole for the trap at the Pterostichus shinbodakensis type locality, showing the subterranean environment 6 Aboveground environment of the Pterostichus tateishiyamanus type locality 7 Hole for the trap at the Pterostichus tateishiyamanus type locality, showing the subterranean environment. The magnifications of the photos vary (see text for trap size)
J C Van Lenteren - One of the best experts on this subject based on the ideXlab platform.
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effect of light quality on movement of Pterostichus melanarius coleoptera carabidae
Journal of Applied Entomology, 2012Co-Authors: A B Allema, W A H Rossing, W Van Der Werf, B G Heusinkveld, Tibor Bukovinszky, E G Steingrover, J C Van LenterenAbstract:Behaviour of nocturnal insects is routinely observed under red light, but it is unclear how the behaviour under red light compares to behaviour in complete darkness, or under a source of white light. Here, we measure movement behaviour of the nocturnal carabid beetle Pterostichus melanarius Illiger (Coleoptera: Carabidae) using camera recording under a near-infrared (nir), red or white radiation source. Red light significantly reduced movement speed in females similar to the effect of white light and different from nir. Also movement activity and pause length were affected by radiation source, with a significant difference between nir and white light, and with intermediate values in red light. The results presented here indicate that P. melanarius has different movement behaviour under the three radiation sources and suggest that nir rather than red radiation is most appropriate for measuring behaviour in total darkness. However, in the field total darkness is rare both because of natural light sources such as the moon and stars but increasingly also because of ecological light pollution, and therefore red light may still be of use for observing ecologically and practically relevant natural night-time behaviour.
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egg laying site preferences of Pterostichus melanarius in mono and intercrops
Bulletin of Insectology, 2008Co-Authors: H Trefas, J C Van LenterenAbstract:Increased vegetational diversity influences the behaviour of carabid beetles by changing plant-related abiotic factors. These abiotic factors (light, humidity and habitat structure) affect the selection of oviposition sites and egg survival of carabid beetles. In a field experiment, more larvae of Pterostichus melanarius (Illiger) (Coleoptera Carabidae) were caught in Brussels sprout intercropped with barley than in Brussels sprout alone. The influence of the presence of living barley and Brussels sprout plants on oviposition was studied in the laboratory. Also, the effects of wet/dry substrate, light/shadowed and structured/unstructured environment on the number of eggs laid were investigated under laboratory conditions. Results indicate a preference for moist, shadowed, structurally complex environments as egg laying sites. This preference results in significantly higher numbers of eggs laid by beetles in barley compared to Brussels sprout. Vegetation characteristics by themselves may influence egg-laying-site preferences, in addition to the availability of prey for adults and larvae in the different cropping systems. Vegetables intercropped with cereals provide a more favourable microclimate for the reproduction of P. melanarius than vegetables grown alone
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egg laying site preferences in Pterostichus melanarius illiger coleoptera carabidae
Proceedings of the Netherlands Entomological Society meeting, 2004Co-Authors: H Trefas, J C Van LenterenAbstract:In the case of ground beetles, the number of studies investigating the effects plant-related structure and microclimate on the selection of egg laying sites is very limited. The egg laying site preference of Pterostichus melanarius, an important carabid beetle in agricultural fields, was studied under laboratory conditions. The effects of wet/dry substrate, light/shadow and structured/unstructured environment on the number of eggs laid were investigated, as well as the influence of the presence of barley and Brussels sprout plants. We found that there was a strong influence of plant structure and microclimate on the selection of egg laying sites. Results showed a higher numbers of eggs laid in barley compared to Brussels sprouts. These results were supported by a significant preference for moist, shadowed, structurally complex environments as egg laying sites. Results indicate that vegetation characteristics in themselves may influence egg laying site preferences, beside the availability of prey for the adults and larvae, in the different plant systems.
Sasakawa Kôji - One of the best experts on this subject based on the ideXlab platform.
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Figures 12-22 from: Sasakawa K, Itô H (2017) Two new species of the Pterostichus macrogenys species group (Coleoptera, Carabidae) discovered in shallow subterranean habitats in northern Honshu, Japan. Subterranean Biology 21: 47-56. https://doi.org/10.3897/subtbiol.21.11155
2017Co-Authors: Sasakawa Kôji, Itô HirotarôAbstract:Figures 12-22 - Male genitalia of species of the macrogenys species group. Left lateral view (12), right lateral view (13), left dorsolateral view (14), and right dorsolateral view (15) of endophallus of Pterostichus shinbodakensis sp. n., holotype. Dorsal view of apical part (16), left lateral view (17), and ventral view of apical part (18) of right paramete of Pterostichus shinbodakensis sp. n., holotype. Dorsal view of apical part (19) and left lateral view (20) of right paramete of Pterostichus falcispinus from the type locality. Left lateral view (21) and right lateral view (22) of endophallus of Pterostichus tateishiyamanus sp. n., holotype. go: gonopore; lal: left apical lobe; lpb: left pigmented band; lpl: left preapical lobe; rpl: right preapical lobe. Scale bar = 0.5 mm
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Figures 1-7 from: Sasakawa K, Itô H (2017) Two new species of the Pterostichus macrogenys species group (Coleoptera, Carabidae) discovered in shallow subterranean habitats in northern Honshu, Japan. Subterranean Biology 21: 47-56. https://doi.org/10.3897/subtbiol.21.11155
2017Co-Authors: Sasakawa Kôji, Itô HirotarôAbstract:Figures 1-7 - Design of subterranean baited traps and the aboveground and subterranean environments at the collection sites. 1 Trap without cover, showing sections containing attractant (larger container) and preservative (smaller container) 2 Trap with cover, showing the entrance section (square with broken lines) 3 Trap installed in hole, showing nylon cord, part of which will be left aboveground as a marker 4 Aboveground environment of the Pterostichus shinbodakensis type locality 5 Hole for the trap at the Pterostichus shinbodakensis type locality, showing the subterranean environment 6 Aboveground environment of the Pterostichus tateishiyamanus type locality 7 Hole for the trap at the Pterostichus tateishiyamanus type locality, showing the subterranean environment. The magnifications of the photos vary (see text for trap size)
