3D tomographic analysis of the order-disorder interplay in the Pachyrhynchus congestus mirabilis weevil

Djeghdi, Kenza; Steiner, Ullrich; Wilts, Bodo D.

doi:10.48550/arxiv.2204.02228

Cited by 1 publication

(4 citation statements)

References 59 publications

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“…Pachyrhynchus weevils are an ideal species to study variations in structural coloration, not only because of their vast color palette extending from deep-red to the UV, but also because of their ability to create both ordered and quasi-ordered 3D PCs. [20] Although ordered and quasi-ordered 3D PCs within a single specimen have previously been reported, [21,22] ) these ordered and quasi-ordered scales were differently colored and located in distinct sections of the elytron. Furthermore, these previously investigated species lack the vast range in colors found across Pachyrhynchus.…”

Section: Order and Disordermentioning

confidence: 92%

“…These structures have garnered significant attention due to their ability to create angle-independent, stable colors with natural materials, without the need for a complete PBG. These structures have been described in beetles such as Pachyrhynchus congestus mirabilis, [20] Eupholus magnificus, [21] and Sulawesiella rafaelae [22] . Unlike ordered PCs,…”

Section: Introductionmentioning

confidence: 93%

“…While the used procedure can approximate the ff, accurate 3D tomographic data for ordered and quasi-ordered scales of P. congestus mirabilis weevils exhibited ff values of 0.44 and 0.32, respectively. [20] The study of other Pachyrhynchus specimens with ordered PCs reported ff-values of 0.4, but since they were also based on 2D data, these values are only estimates. [29,30] Further trends in the optical data were also explored.…”

Section: Variations Within Order: Structural Parametersmentioning

confidence: 99%

“…Previously, X-ray and electron-microscopy-based techniques have been employed to describe these structures. [20,23] Recently, Djeghdi et al [20] investigated a focused ion beam/ scanning electron microscopy (FIB-SEM)-based tomographic reconstruction of the quasi-ordered structures within the elytral scales of a Pachyrhynchus congestus mirabilis weevil. This weevil possesses both blue-colored scales based on a quasi-ordered chitinous network as well as red-colored scales incorporating an ordered diamond 3D PC in their wing scales.…”

Section: Introductionmentioning

confidence: 99%

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Pachyrhynchus Weevils Use 3D Photonic Crystals with Varying Degrees of Order to Create Diverse and Brilliant Displays

Parisotto

Steiner

Cabras

et al. 2022

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The brilliant appearance of Easter Egg weevils, genus Pachyrhynchus (Coleoptera, Curculionidae), originates from complex dielectric nanostructures within their elytral scales and elytra. Previous work, investigating singular members of the Pachyrhynchus showed the presence of either quasi‐ordered or ordered 3D photonic crystals based on the single diamond () symmetry in their scales. However, little is known about the diversity of the structural coloration mechanisms within the family. Here, the optical properties within Pachyrhynchus are investigated by systematically identifying their spectral and structural characteristics. Four principal traits that vary their appearance are identified and the evolutionary history of these traits to identify ecological trends are reconstructed. The results indicate that the coloration mechanisms across the Easter Egg weevils are diverse and highly plastic across closely related species with features appearing at multiple independent times across their phylogeny. This work lays a foundation for a better understanding of the various forms of quasi‐ordered and ordered diamond photonic crystal within arthropods.

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Section: Order and Disordermentioning

confidence: 92%