This dataset contains the raw Micro-CT data and a 3D CT reconstruction of a piece of Burmese amber CNU009432 from "Guo, X., Selden, P. and Ren, D. (2021) Maternal care in mid-Cretaceous lagonomegopid spiders. Proc. R. Soc. B.". These data shows the maternal care behaviour of an adult female lagonomegopid spider guarding her egg sac. 

Maternal care benefits the survival and fitness of offspring often at a cost to the mother's future reproduction and has evolved repeatedly throughout the animal kingdom. In extant spider species, this behaviour is very common and has different levels and diverse forms. However, evidence of maternal care in fossil spiders is quite rare. In this study,we describe four Mid-Cretaceous (approx. 99 Ma) amber specimens from northern Myanmar with an adult female, part of an egg sac and some spiderlings of the extinct family Lagonomegopidae preserved, which suggest that adult lagonomegopid females probably built and then guarded egg sacs in their retreats or nests, and the hatched spiderlings may have stayed together with their mother for some time. The newfossils represent early evidence of maternal care in fossil spiders, and enhance our understanding of the evolution of this behaviour.

Micro-CT scanning of CNU009432 was carried out with a Micro-CT (MicroXCT-400, ZEISS), located at the Institute of Zoology, Chinese Academy of Sciences. The three-dimensional structure of the large lagonomegopid spider and the egg sac was reconstructed using Avizo software. 

This dataset contains the raw Micro-CT data and a 3D CT reconstruction of a piece of Burmese amber CNU009432. This amber has a large lagonomegopid spider and part of an egg sac preserved. 

The raw Micro-CT data are .tiff files, they can be used for the 3D CT reconstruction. The 3D CT reconstruction data is .hx file, which can be opened by Avizo software.