The maxillary palpi of the predaceous diving beetle Cybister /imbriolatus /imbriolatus Say were observed by transmission and scanning electron microscopy.Scanning electron microscopy shows at least two types of sensilla at the tip of palp, which are referred to as "circumvallate and naked sensilla". The former are innervated with outer segments of distal processes of sensory cells, but the latter are provided only with chitin and cuticular substances.Key.Words: Maxillary palpi --Circumvallate sensilla --Naked sensilla --Sensory cells --Cybister/imbriolatus (beetle).A large number of studies necessary for understanding insect sense organs have been made by electron microscopy (e.g.
According to Schmaltz's review (1911) on light microscopic features of several animal spermatozoa, there are completely different two types in avain spermatozoa : one of them belongs to the songbird spermatozoon which is similar to the amphibian in a long coiled eyeleteer-shaped head and in a flagellum provided with a helically coiled sheath ; and the other to the domestic fowl which is very similar to the reptilian in a short rod-shaped head and in a delicate flagellum.Recently, this fact has been confirmed with scanning electron microscopy by Yasuzumi and his coworkers (1974). With the advent of the electron microscope, many excellent studies have been performed on several avian spermatozoa and their spermiogenesis.These studies were concerned with the Galliformes (
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