Petiole (insect anatomy) a pedicel, but in entomology, that term is more correctly reserved for the second segment of the antenna; while in arachnology, 'pedicel' is the accepted term to define the constriction between the cephalothorax and abdomen of spiders. The plump portion of the abdomen posterior to the petiole (and postpetiole in the Myrmicinae) is called the gaster. The structure of the petiole is an easy way to visually classify ants, because the major subfamilies of Formicidae have structural differences: some ants have two-segmented petioles, while others have a single-segmented petiole. Petiole may also be used in the context of wing veins,
National Insect Week entries from large numbers of amateur photographers. As well as promoting the importance of insect science to the wider public, National Insect Week particularly aims to encourage young people into entomology. Past National Insect Week campaigns have been endorsed by HRH The Prince of Wales, Prof David Bellamy OBE, Chris Packham, Kate Humble and Mike Dilger. The next National Insect Week will be 18-24 June, 2018. National Insect Week National Insect Week is a biennial initiative in the UK. Usually held during the last week of June, the aim is to engage the general public with the importance of insects