Ultrablack color in velvet ant cuticle

Beilstein J Nanotechnol. 2024 Dec 2:15:1554-1565. doi: 10.3762/bjnano.15.122. eCollection 2024.

Abstract

We studied the ultrastructure of the ultrablack cuticle in Traumatomutilla bifurca, an enigmatic and visually striking species of velvet ants (Hymenoptera, Mutillidae). Using a combination of scanning electron microscopy (SEM), transmission electron microscopy (TEM), confocal laser scanning microscopy (CLSM), and optical spectroscopy, we conducted a comprehensive analysis of the cuticle to elucidate its unique optical properties. SEM imaging provided a detailed surface morphology, while TEM provided insights into the internal structure. CLSM showed that the cuticle exhibits no autofluorescence. Our findings reveal a highly specialized cuticle, characterized by microstructures that effectively minimize reflectance and enhance light absorption. Optical spectrometry confirmed the ultrablack nature of the cuticle, with the measured reflectance approaching minimal levels across a broad spectrum of wavelengths. Therefore, our study contributes to a deeper understanding of ultrablack biological materials and their potential applications in biomimetics.

Keywords: Hymenoptera; Mutillidae; animal coloration; biophotonics; insects; superblack; surface.

Grants and funding

This study was supported by the National Council for Scientific and Technological Development - CNPq (proc.142299/2020-0) and Minas Gerais State Research Support Foundation - FAPEMIG (proc. APQ-05401-23). RGF thanks CNPq (Proc. 312847/2022-0) for a productivity grant. We thank the Public Prosecutor's Office of Minas Gerais (MPMG, through the Regional Coordination of Environmental Prosecutor's Offices of the Paranaíba and Lower Grande River Watersheds) for constant support.