Sentence:  Unlike the <WSD>proboscides</WSD> of Lower brachyceran lineages, which are continuous with the head capsule and tend to dangle (Matsuda 1965), the <WSD>proboscides</WSD> of most cyclorrhaphan species are suspended by a membranous region and divided into three functional parts: the basiproboscis (rostrum), medioproboscis (haustellum), and distiproboscis (labellum), each of which is defined by internal muscles but also shares muscles with the other regions (Graham-Smith 1930; Lall and Davies 1971). 
Meaning of the word marked with <WSD> tags:  The tubular feeding and sucking organ of certain invertebrates like insects, worms and molluscs.