The oldest fossil darkling beetle of the genus Neomida Latreille, 1829 (Coleoptera: Tenebrionidae) from Eocene Baltic amber examined with X-ray microtomography 

Zootaxa ◽  
2020 ◽  
Vol 4768 (3) ◽  
pp. 435-442 ◽  
Author(s):  
MAXIM V. NABOZHENKO ◽  
KRISTAPS KAIRIŠS ◽  
ANDRIS BUKEJS
Keyword(s):  
Phase Contrast ◽  
Baltic Amber ◽  
Weakly Convex ◽  
X Ray ◽  
Strongly Convex ◽  
Darkling Beetle ◽  
Tenebrionid Beetle ◽  
Single Well ◽  
Lateral Margins ◽  
Coleoptera Tenebrionidae

Based on a single well-preserved specimen from Eocene Baltic amber, a new tenebrionid beetle Neomida groehni Nabozhenko et Bukejs sp. nov. (Diaperinae: Diaperini) is described and illustrated using phase-contrast X-ray microtomography. This oldest representative of the genus differs from all known extant and extinct congeners by the dorsally very weakly convex pronotum with undulate lateral margins (while other Neomida have a pronotum that is strongly convex along its transverse axis, with evenly rounded lateral margins); distinct, right posterior angles of pronotum; and elevated sutural area of the elytra. 

A new species of anapid spider (Araneae: Araneoidea, Anapidae) in Eocene Baltic amber, imaged using phase contrast X-ray computed micro-tomography

Zootaxa ◽  
2011 ◽  
Vol 2742 (1) ◽  
pp. 60 ◽  
Author(s):  
DAVID PENNEY ◽  
ANDREW MCNEIL ◽  
DAVID I. GREEN ◽  
ROBERT BRADLEY ◽  
YURI M. MARUSIK ◽  
...  
Keyword(s):  
New Species ◽  
Phase Contrast ◽  
Baltic Amber ◽  
X Ray ◽  
The Family ◽  
X Ray Computed ◽  
Micro Tomography ◽  
The Baltic ◽  
A New Species ◽  
Eocene Amber

A new species of the extant spider family Anapidae is described from a fossil mature male in Eocene amber from the Baltic region and tentatively assigned to the genus Balticoroma Wunderlich, 2004. Phase contrast X-ray computed micro-tomography was used to reveal important features that were impossible to view using traditional microscopy. Balticoroma wheateri new species is easily diagnosed from all other anapids by having clypeal extensions that run parallel to the ectal surface of the chelicerae and in having the metatarsus of the first leg highly reduced and modified into what is presumably a y-shaped clasping structure. Although only a single extant anapid species occurs in northern Europe, the family was diverse in the Eocene. The discovery of yet another anapid species in Baltic amber supports the idea that Eocene European forests may have been a hotspot of evolution for this family of spiders.

scholarly journals RARE ENDEMIC DARKLING BEETLE HEDYPHANES NYCTERINOIDES FALDERMANN, 1837 (COLEOPTERA: TENEBRIONIDAE) FROM DAGESTAN AS AN INDICATOR OF HALOPHYTIC BIOTOPES

2019 ◽  
Vol 14 (2) ◽  
pp. 164-171
Author(s):  
M. V. Nabozhenko ◽  
A. A. Teymurov ◽  
Z. I. Soltanmuradova
Keyword(s):  
Separate Species ◽  
Trophic Relations ◽  
The Past ◽  
Darkling Beetle ◽  
Tenebrionid Beetle ◽  
Population Reduction ◽  
Halophytic Plant ◽  
History Of ◽  
Rare Endemic ◽  
Coleoptera Tenebrionidae

Aim. In this work, we aimed to study the distribution and habitat of rare Caucasian tenebrionid beetle Hedyphanes nycterinoides, as well as to identify reasons for the population re‐ duction and to develop a basis for its protection.Methods. Materials from the largest collection of the Zoological Institute RAS (St Petersburg) along with the authors’ fieldwork data were used for mapping the past and current distribution of the species, as well as for studying its habitat and possible trophic relations.Results. The taxonomic history of H. nycterinoides is complicated due to the loss of the type material. This taxon is currently interpreted as a separate species. H. nycterinoides is distributed across Piedmont Dagestan and Intermountain Dagestan (Russia); however, all known specimens were collected only in the 19th‐20th centuries (the last record is dated 1984). The population of H. nycterinoides from Intermountain Dagestan is likely to have died out due to the filling of the Irganay reservoir in 2008. Only one present‐day population from the arid Rubas valley in Southern Dagestan is known. The species inhabits saline soils (solonetz, solonchak) and feeds on saltworts. It is active in April–May in the evening or in the daytime provided it is cloudy.Conclusions. We recommend that H. nycterinoides be included in the list of threatened species of Dagestan as an indicator of the state of halophytic plant communities from the hilly landscapes of the Eastern Caucasus. The main factors of the contemporary population reduction include overgrazing and filling of reservoirs. 

The first described darkling beetle of the tribe Metaclisini (Coleoptera: Tenebrionidae) from Eocene Baltic amber

Zootaxa ◽  
2021 ◽  
Vol 4999 (3) ◽  
pp. 279-284
Author(s):  
MAXIM V. NABOZHENKO ◽  
RYAN C. MCKELLAR ◽  
ANDRIS BUKEJS
Keyword(s):  
New Species ◽  
Baltic Amber ◽  
Extinct Species ◽  
Darkling Beetle ◽  
Extant Species ◽  
First Time ◽  
Coleoptera Tenebrionidae

The description of an extinct species of Metaclisa Jacquelin du Val, 1861 (Tenebrionidae) is presented. This genus and the tribe Metaclisini are recorded as fossils for the first time, from Eocene Baltic amber. The new species Metaclisa ottoi sp. nov. belongs to the subgenus Trichometaclisa subgen. nov. and differs from all other Metaclisini in possessing short, fine recumbent setation on the pronotum and elytra; in addition, the prosternal process in Metaclisa ottoi sp. nov. is roundly bent down and weakly projected behind the procoxae, which differs from extant species.

scholarly journals Description of a new genus and two new species of Leiodidae (Coleoptera) from Baltic amber using phase contrast synchrotron X-ray microtomography

Zootaxa ◽  
2012 ◽  
Vol 3455 (1) ◽  
pp. 81 ◽  
Author(s):  
MICHEL PERREAU
Keyword(s):  
New Species ◽  
Phase Contrast ◽  
New Genus ◽  
Evolutionary Relationship ◽  
Baltic Amber ◽  
Fossil Species ◽  
X Ray ◽  
Non Invasive ◽  
Internal Morphology ◽  
Two New Species

A new genus and two new amber fossil species of Leiodidae are described: Catops perkovskyi sp. n. (CholevinaeCholevini) and Tafforeus cainosternus gen. n., sp. n. (Leiodinae Pseudoliodini); using virtual dissection by propagationphase contrast synchrotron X-ray microtomography, which allows for visualization of the genital structures in a non-invasive way. The external and internal morphology of the new species is compared to that of the extant related species.Putative evolutionary relationship between Tafforeus and the genus Cainosternum Notman, 1921, and their placement in the tribe Pseudoliodini are discussed.

scholarly journals First record of Mothocya arrosor Bruce, 1986 parasitizing Euleptorhamphus viridis (van Hasselt, 1823) from India

2021 ◽  
pp. 4-7
Author(s):  
P. Vigneshwaran ◽  
S. Ravichandran
Keyword(s):  
Dorsal View ◽  
First Record ◽  
The Body ◽  
Weakly Convex ◽  
Gill Rakers ◽  
Southeast Coast Of India ◽  
Strongly Convex ◽  
Gross Lesions ◽  
Lateral Margins ◽  
Gill Lamellae

The first record of Mothocya arrosor Bruce, 1986 parasitizing ribbon halfbeak fish Euleptorhamphus viridis is here reported from the southeast coast of India. The important characters distinguishing M. arrosor from other species in the genus include the body slightly twisted to one side, dorsum weakly convex, coxae of pereonites 6 and 7 distinctly rounded, pleon more completely overlapped by pereonite 7, pleonite 1 scarcely visible in dorsal view, uropod peduncle longer than rami, lacking strongly convex medial and lateral margins. The damage of gill rakers and erosion of gill lamellae were the acute gross lesions observed as a result of isopod infestation.

Image Quality Analysis of X-ray Grating Interferometer Using Integrating-bucket Method

2020 ◽  
Vol 64 (2) ◽  
pp. 20503-1-20503-5
Author(s):  
Faiz Wali ◽  
Shenghao Wang ◽  
Ji Li ◽  
Jianheng Huang ◽  
Yaohu Lei ◽  
...  
Keyword(s):  
Image Quality ◽  
Phase Contrast ◽  
Quality Analysis ◽  
Phase Contrast Imaging ◽  
Phase Image ◽  
Contrast Imaging ◽  
High Quality ◽  
Image Quality Analysis ◽  
X Ray ◽  
Grating Interferometer

Abstract Grating-based x-ray phase-contrast imaging has the potential to enhance image quality and provide inner structure details non-destructively. In this work, using grating-based x-ray phase-contrast imaging system and employing integrating-bucket method, the quantitative expressions of signal-to-noise ratios due to photon statistics and mechanical error are analyzed in detail. Photon statistical noise and mechanical error are the main sources affecting the image noise in x-ray grating interferometry. Integrating-bucket method is a new phase extraction method translated to x-ray grating interferometry; hence, its image quality analysis would be of great importance to get high-quality phase image. The authors’ conclusions provide an alternate method to get high-quality refraction signal using grating interferometer, and hence increases applicability of grating interferometry in preclinical and clinical usage.

Sign in / Sign up

Export Citation Format

Share Document