Publications by authors named "Marcin Ras"

In many extreme arid ecosystems, insects constitute major faunal components and are key contributors in nutrient cycling. Previous research on xerophily in insects has focused on adult forms. This study investigates skeletomuscular and behavioural adaptations of the Kalahari sandworm beetle larvae (Gonopus tibialis Fabricius) for dwelling in the sand.

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The tracheal system comprises one of the major adaptations of insects towards a terrestrial lifestyle. Many aspects such as the modifications towards wing reduction or a life in an arid climate are still poorly understood. To address these issues, we performed the first three-dimensional morphometric analyses of the tracheal system of a wingless insect, the desert beetle and compared it with a flying beetle ().

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Article Synopsis
  • Tok-tokkies are a notable group within darkling beetles known for their unique substrate tapping communication, but the phylogenetic relationships among them are unclear.
  • This study analyzes the morphology of female reproductive structures across over 200 species, revealing distinctive features and relationships, while also defining 23 key characters specific to tok-tokkies.
  • Cladistic analysis indicates that many subtribes are not monophyletic, leading to several taxonomic revisions and the establishment of new genera and species based on morphological and molecular data.
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Article Synopsis
  • The study focuses on the tracheal system in holometabolous insects, specifically its post-embryonic development using micro-computed tomography for detailed analysis.
  • It examines different developmental stages (larvae, pupae, adults) of Tenebrio molitor, analyzing anatomical features like spiracle arrangement and tracheal sizes, with a sample size of 29 individuals for statistical reliability.
  • The research identifies three respiratory modules—cephalo-prothoracic, metathoracic, and abdominal—that are consistent across all stages, highlighting the structural organization and modularity of the tracheal system.
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In recent years, μCT-based studies of the insect tracheal system have become an increasingly important area of research. Nevertheless, the methods proposed in previous research for investigating the respiratory system in the three-dimensional space were described and tested based on a relatively small number of specimens. Additionally, the individuals studied in all these cases represented only a single post-embryonic stadium - pupa or imago - of a particular insect species.

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