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Pulvilli
Pulvilli are soft, cushionlike pads on the feet of insects and other arthropods, such as the housefly and ixodid ticks. They are located at the base of the claws (#2 in the figure at right). The pulvilli function as an adhesive system. Their sticking power comes partly from Van der Waals force In molecular physics, the van der Waals force is a distance-dependent interaction between atoms or molecules. Unlike ionic or covalent bonds, these attractions do not result from a chemical electronic bond; they are comparatively weak and th ..., and partly from an adhesive fluid secreted from the extremities onto surfaces. References Insect morphology {{arthropod-anatomy-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Housefly
The housefly (''Musca domestica'') is a fly of the suborder Cyclorrhapha. It is believed to have evolved in the Cenozoic Era, possibly in the Middle East, and has spread all over the world as a commensal of humans. It is the most common fly species found in houses. Adults are gray to black, with four dark, longitudinal lines on the thorax, slightly hairy bodies, and a single pair of membranous wings. They have red eyes, set farther apart in the slightly larger female. The female housefly usually mates only once and stores the sperm for later use. She lays batches of about 100 eggs on decaying organic matter such as food waste, carrion, or feces. These soon hatch into legless white larvae, known as maggots. After two to five days of development, these metamorphose into reddish-brown pupae, about long. Adult flies normally live for two to four weeks, but can hibernate during the winter. The adults feed on a variety of liquid or semi-liquid substances, as well as solid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ixodidae
The Ixodidae are the family of hard ticks or scale ticks, one of the three families of ticks, consisting of over 700 species. They are known as 'hard ticks' because they have a scutum or hard shield, which the other major family of ticks, the 'soft ticks' (Argasidae), lack. They are ectoparasites of a wide range of host species, and some are vectors of pathogens that can cause human disease. Description They are distinguished from the Argasidae by the presence of a scutum. In both the nymph and the adult, a prominent gnathosoma (or capitulum, mouth and feeding parts) projects forward from the animal's body; in the Argasidae, conversely, the gnathosoma is concealed beneath the body. They differ, too, in their lifecycle; Ixodidae that attach to a host bite painlessly and are generally unnoticed, and they remain in place until they engorge and are ready to change their skin; this process may take days or weeks. Some species drop off the host to moult in a safe place, whereas others r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chersodromia Hirta Tarsus-labeled (Francis Walker 1851 Insecta Britannica Vol1 PlateV Page332)
''Chersodromia'' is a genus of hybotid dance flies in the family Hybotidae. There are more than 70 described species in ''Chersodromia''. Species These 73 species belong to the genus ''Chersodromia'': *'' Chersodromia adriatica'' Chvála, 1970 *'' Chersodromia alata'' (Walker, 1835) *'' Chersodromia albipennis'' ( Perris, 1852) *'' Chersodromia albopilosa'' Chvála, 1970 *'' Chersodromia amaura'' (Becker, 1902) *'' Chersodromia ancilottoi'' Raffone, Rampini & Scarpa, 1988 *'' Chersodromia anisopyga'' Plant, 1995 *'' Chersodromia arenaria'' ( Haliday, 1833) *'' Chersodromia argentina'' Quate, 1960 *'' Chersodromia beckeri'' Melander, 1928 *'' Chersodromia bulohensis'' Grootaert & Shamshev, 2012 *'' Chersodromia bureschi'' Beschovski, 1973 *'' Chersodromia cana'' Melander, 1945 *'' Chersodromia caucasica'' Chvála, 1970 *'' Chersodromia colliniana'' Frey, 1936 *'' Chersodromia cursitans'' ( Zetterstedt, 1819) *'' Chersodromia curtipennis'' Collin, 1950 *'' Chersodromia dissit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Van Der Waals Force
In molecular physics, the van der Waals force is a distance-dependent interaction between atoms or molecules. Unlike ionic or covalent bonds, these attractions do not result from a chemical electronic bond; they are comparatively weak and therefore more susceptible to disturbance. The van der Waals force quickly vanishes at longer distances between interacting molecules. Named after Dutch physicist Johannes Diderik van der Waals, the van der Waals force plays a fundamental role in fields as diverse as supramolecular chemistry, structural biology, polymer science, nanotechnology, surface science, and condensed matter physics. It also underlies many properties of organic compounds and molecular solids, including their solubility in polar and non-polar media. If no other force is present, the distance between atoms at which the force becomes repulsive rather than attractive as the atoms approach one another is called the van der Waals contact distance; this phenomenon resul ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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