Which sex should care for offspring is a fundamental question in evolution. Invertebrates,
and insects in particular, show some of the most diverse kinds of parental care of all animals …

Uniquely positioned at the intersection of sexual selection, nutritional ecology and life-
history theory, nuptial gifts are widespread and diverse. Despite extensive empirical study …

Male genital organs are among the fastest evolving morphological structures. However,
large parts of the male's genitalia are often hidden inside the female during mating. In …

Males of certain bushcrickets (Orthoptera: Ensifera: Tettigoniidae) possess sclerotized
internal genital devices termed titillators. These titillators are paired chitinized structures for …

Neopanorpa, the second largest genus in Panorpidae, is mainly characterized by the well-
developed notal organ on male tergum III. However, it remains largely unknown how the …

The scorpionfly genus Cerapanorpa is characterized by the male possessing a single finger‐
like anal horn on the posterior portion of tergite VI. However, the functional morphology of …

In most species with internal fertilization, male genitalia evolve faster than other
morphological structures. This holds true for genital titillators, which are used exclusively …

Males of the bushcricket Metrioptera roeselii bear paired titillators that are spiny genital
structures supposedly functioning as copulatory courtship devices. During copulation, the …

In his pioneering work on cryptic female choice, Eberhard identified a wide range of
mechanisms that potentially allow multiply-mated females to bias paternity in favour of …

The operational sex ratio (OSR) is one of the most important ecological factors affecting the
structure of mating systems and individual mating investment. Bush cricket males produce a …