eversible


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eversible

(of structures) being capable of protruding from an organism by being turned inside out. Examples include the eversible proboscis in some worms, and the eversible cloaca in some birds that can be protruded to form a penis-like structure used in copulation.
References in periodicals archive ?
Direct observations show that just prior to intromission, if the female raises her ovipositor and extends it so that the apical portion of the aculeus is exposed from the eversible membrane, the male can grasp it with his genitalic surstyli.
All four species possessed eversible sacs; however, while the eversible sac was simple for A.
This last mentioned genus is particular because according to HALL & HARVEY (2002: 185) it possesses specialized androconial organ: the abdominal coremata, which is a pair of eversible tubes of membranous type only present in certain nymphalid subfamilies (Danainae, Satyrinae and Morphinae).
This accuracy could certainly be as a result of employing the paddle deflectors and highly flexible abdominal tip, but the muscular eversible spray nozzle with hydrodynamic pores as shown here may serve to achieve accuracy.
Each capsule contains a folded, eversible tubule containing a variety of toxins.
This may explain the r eversible characteristics of physical gelation observed in EVA-organoclay systems.
In fact, asymmetry of the eversible vesica is nearly universal in Lepidoptera (Chapman 1902) and appears associated with asymmetry in the female internal genitalia (Huber et al.
Species of Pyrgotomyia share the long antenna (pedicel and flagellomere 1 long), long oviscape, and eversible membrane of the ovipositor with rudimentary (or without any) sclerotized structures, and I consider these characters to support monophyly of the genus.
The copulatory organ is a mass of richly vascularized tissue, with intense pigmentation from the base to the extremity of the penis, which is eversible through the cloaca by the action of erector muscles and blood inflow.