Insect morphology least three different positions: prognathous, opisthognathous, and hypognathous. In species with prognathous articulation, the head is positioned vertically aligned with the body, such as species of Formicidae; while in a hypognathous type, the head is aligned horizontally adjacent to the body. An opisthognathous head is positioned diagonally, such as species of Blattodea and some Coleoptera. The mouthparts vary greatly between insects of different orders, but the two main functional groups are mandibulate and haustellate. Haustellate mouthparts are used for sucking liquids and can be further classified by the presence of stylets, which include piercing-sucking, sponging, and siphoning. The stylets are
Oxford Scientific Films name from Parks' existing company Oxford Biological Films. Thompson, Parks, Morris, Paling, and Thompson's son David, headed the new company, which began operating on 8 July 1968. Thompson remained at his position at Oxford University while the company building was being completed, while the other four travelled to America to make the film loops for Ealing. Thompson resigned from the university on 2 September 1969, taking on the work at Oxford Scientific Films full-time. The company focused initially on filming nature at a microscopic level, including insect and aquatic wildlife. Using specialised equipment and camera techniques the developed themselves, the