Definition Brevisiana brevis is a species of cicada belonging to the family Cicadidae, known primarily for its exceptionally loud acoustic signals.
Overview This insect is native to Southern Africa and is widely recognized for possessing one of the loudest known insect calls in the world. As a member of the order Hemiptera, which includes true bugs, it undergoes an incomplete metamorphosis with a prolonged nymphal stage spent underground. Adult Brevisiana brevis cicadas emerge for a relatively short period, primarily for reproduction, during which their distinct calls dominate the soundscape of their habitats.
Etymology/Origin The genus name Brevisiana and the specific epithet brevis both derive from the Latin word "brevis," meaning "short." While "brevis" is a common descriptor in taxonomy, the precise morphological feature or characteristic of Brevisiana brevis to which the name refers is not consistently detailed across all general entomological literature. It may refer to its body length, wing length, or other aspects compared to related species.
Characteristics
- Morphology: Adult Brevisiana brevis cicadas typically exhibit a robust body structure, often with dark coloration and patterns that provide camouflage against tree bark. They are generally medium-sized cicadas, with body lengths commonly ranging from 2 to 3 centimeters. Like other cicadas, they possess prominent compound eyes, short antennae, and two pairs of membranous wings.
- Acoustics: The most notable characteristic of Brevisiana brevis is its extraordinarily loud song, which is among the loudest produced by any insect. This sound is generated by specialized, rapidly vibrating membranes called tymbals, located on the sides of the abdomen. The male cicada's call primarily serves to attract mates and establish territories. Scientific measurements have recorded sound pressure levels exceeding 100 decibels at close range for this species, making it a significant subject in bioacoustic research.
- Habitat and Distribution: This species is endemic to various regions of Southern Africa, including countries such as Botswana, Namibia, and South Africa. It typically inhabits woodlands, savannas, and shrublands where suitable host trees are available for both nymphal development and adult perching.
- Life Cycle: The life cycle of Brevisiana brevis involves an extended nymphal stage, where nymphs live underground, feeding on the sap of tree roots for several years. Upon reaching maturity, the nymphs emerge from the soil, molt into winged adults, and embark on a short adult phase dedicated to mating and egg-laying.
Related Topics
- Cicadidae: The biological family to which Brevisiana brevis belongs, characterized by their unique sound-producing organs (tymbals) and often long nymphal stages.
- Bioacoustics: The interdisciplinary science that studies sound production, transmission, and reception in biological systems, for which Brevisiana brevis serves as a prominent example due to its extreme vocalization.
- Hemiptera: The insect order that encompasses cicadas, true bugs, aphids, and leafhoppers, characterized by their piercing-sucking mouthparts.