Attachment Devices of Insect Cuticle by Stanislav S. N. Gorb PDF

By Stanislav S. N. Gorb

In 1974 while I released my e-book, organic Mechanism of Attachment, no longer many pages have been required to file at the attachment units of insect cuticles. As in such a lot fields of study, our wisdom in this particular topic has easily exploded. Dr. Stanislav N. Gorb now describes the current day point of our wisdom, to which he has in my opinion contributed a lot, and a study crew engaged on organic microtribology has steadily built, additionally. With glossy tools of size it really is attainable to go into the constitution – functionality dating even more deeply, even all the way down to a molecular point, which used to be impossible and a part many years in the past. it's a renowned indisputable fact that, in biology, the extra subtle the measuring technique, the better the success of organic primary examine, and its ensuing proof. Our wisdom is still at a definite point until eventually new equipment once again let a ahead bounce. organic wisdom develops within the kind of a stepped curve instead of linear, as mirrored within the reviews conducted at the attachment units of insect cuticles.

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Interestingly, acanthae may be characteristic for some structures of large groups of insects. For example, they have been found in the proventriculi of all Mecoptera and Siphonaptera (Richards, 1965) examined. However, they have been reported only for certain representatives of particular coleopteran families (Richards and Richards, 1979). In proventriculi, the acanthae have nearly the same size in any one species studied, but in reproductive ducts a variety of sizes has been observed. The size of the acantha correlates with the size of the corresponding epidermal cell, and its nuclear diameter.

In the forewing, there is an additional comb consisting of a dense row of short, posteriorly directed setae (Fig. 6 A, B). The anterior margin of the hindwing of Psylla buxi bears single, curved setae, which interlock with the S-shaped fold of the posterior margin of the forewing. Additionally, the costal margin of the hindwing is covered with a row of tiny acanthae, functionally corresponding to the surface profile of the S-shaped fold (Fig. 6 D). Presumably, such a frictional mechanism prevents wing-sliding in the interlocked position (Weber, 1930).

The hypostom is armoured with sloped, teeth-like protuberances (Fig. 4 A). In hydracarid mites, the chelae are also armoured with proximally oriented, sharp teeth. Their function is to attach and hold a mite in the host tissues (Mitchell, 1962). To attach themselves into the host tissues, the parasitic copepod Hatschekia pseudohippoglossi uses terminal hooks from the second antennae. In another copepod species, Trebius clidodermi, analogous structures originate from the maxillipeds. The terminal hooks of the second antennae in Achtheinus oblongatus, are additionally armoured with two rows of spines.

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