@article {58188, title = {The call of the squeak beetle: bioacoustics of Hygrobia hermanni (Fabricius, 1775) revisited (Coleoptera: Hygrobiidae)}, year = {2020}, abstract = {

Hygrobiidae, or squeak beetles, originated in the Triassic-Jurassic and exhibit a relictual distribution in the Palaearctic, Oriental and Australasian regions. Hygrobiids are well known for their sound-producing abilities, although studies of their bioacoustics remain limited. Here we describe sound producing organs and bioacoustics of the Palaearctic Hygrobia hermanni (Fabricius, 1775). Plectra and pars stridens were examined in both sexes, and sound characteristics analysed. Despite small differences between male and female last abdominal ventrites, plectra were identical. Pars stridens, however, differed subtly, tooth ridges being wider in females. Calls of both sexes were harmonic, with peak frequency at 6.1\ kHz, and secondary peak at 10.9\ kHz; males exhibiting longer inter-chirp intervals. Calls changed with time in the laboratory, this possibly condition-related effect being more apparent in males. The differences found between sexes suggest that sound production in squeak beetles may function in intraspecific communication, in addition to being an antipredator device.

}, keywords = {bioacoustics, Hygrobia hermanni, pars stridens, squeak beetle, stridulation}, doi = {10.1080/01650424.2020.1726963}, url = {https://www.tandfonline.com/doi/full/10.1080/01650424.2020.1726963https://www.tandfonline.com/doi/pdf/10.1080/01650424.2020.1726963}, author = {Blair, Jordan and Bilton, David T.} } @article {58084, title = {Dung beetle distress signals may be correlated with sex and male morph: a case study on Copris lunaris (Coleoptera: Scarabaeidae, Coprini)}, year = {2020}, abstract = {

Insect sounds are predominantly produced by stridulations, where specialised body parts contact repeatedly to induce acoustic pulse trains. We studied the stridulatory organ and sound emissions in Copris lunaris, by focussing separately on females, and on major and minor males. Results highlighted an isometric growth of pars stridens in response to body size, and identified a wing-pygidium locking structure that assists sound emission. Sex-specific acoustic differences of some degree were detected between major males and females, as sounds emitted by majors showed higher frequencies and shorter pulses with elevated impulse rates. This cannot be immediately explained by size differences in the components of stridulatory apparatus. Rather, divergence might be an indicator of some underlying behavioural difference in response to distressing events. In minor males, acoustic properties overlapped with both females and major males, although incomplete stridulations had a lower ratio in minor than major males. This paper provides the very first perspective of the potential role of sex and male polymorphism on sound production. However, future categorisations of sounds coupled to behavioural observations of specific interactions are needed to reveal the function of sex and morph-specific differences.

}, keywords = {bioacoustics, dung beetles, elytro-abdominal stridulatory organ, male dimorphism, pars stridens, plectrum}, doi = {10.1080/09524622.2019.1710255}, url = {https://www.tandfonline.com/doi/full/10.1080/09524622.2019.1710255https://www.tandfonline.com/doi/pdf/10.1080/09524622.2019.1710255}, author = {Kerman, Kaan and Roggero, Angela and Piccini, Irene and Rolando, Antonio and Palestrini, Claudia} } @article {47745, title = {Stridulatory file and calling song of two populations of the tropical bush cricket Eneoptera surinamensis (Orthoptera, Gryllidae, Eneopterinae)}, journal = {Iheringia. S{\'e}rie Zoologia}, volume = {97}, year = {2007}, month = {Jan-12-2007}, pages = {461 - 465}, abstract = {

This study characterizes the calling song and ultramorphology of the stridulatory file of two geographically isolated populations of the tropical bush cricket Eneoptera surinamensis (De Geer, 1773) from city of Foz do Igua\çu, state of Paran\á, and town of Rio Claro, state of S\ão Paulo, Brazil, distant 1,000 Km from each other. The teeth are shell-shaped, the larger ones are dis tributed in the medium region of the file, decreasing gradually in size towards the edges. Specimens from Foz do Igua\çu have a file with 82 \± 9.8 teeth, length=1.89 mm \± 0.15 with 43.76 \± 5.94 teeth per mm (n=15). Specimens from Rio Claro present a file with 87 \± 9.81, length=1.9 6 \± 0.19 mm with 44.52 \± 4.61 teeth per mm (n=15). Statistical differences found between the two populations are not significant. The calling song is an uninterrupted trill that alternates two sets of notes distinct for its temporal features.

}, keywords = {bioacoustics, Grylloidea, pars stridens, sonogram}, doi = {10.1590/S0073-47212007000400016}, url = {http://www.scielo.br/scielo.php?script=sci_arttext\&pid=S0073-47212007000400016\&lng=en\&tlng=en}, author = {Miyoshi, Akio R. and Zefa, Edison and Luciano de P. Martins and Dias, Pedro G. B. S. and Drehmer, C{\'e}sar J. and Jos{\'e} E. F. Dornelles} } @article {47331, title = {Contribution to the taxonomy of Gryllus Linnaeus, 1758 in South America: Part I: Redescription of Gryllus argentinus Saussure, 1874 (Orthoptera, Grylloidea, Gryllidae)}, journal = {Entomological Science}, volume = {14}, year = {2011}, month = {Jan-01-2011}, pages = {87 - 93}, abstract = {

The genus Gryllus includes 82 described species that occur in America from Canada to Argentina as well as in several areas of Africa, Europe and Asia. There are 12 species in South America, which were described in the nineteenth century based on a small number of samples and inconsistent characters such as body coloration and external morphology. The aim of this article is to redescribe Gryllus argentinus Saussure, 1874 collected in the urban areas of Pelotas, Cap\ão do Le\ão and Rio Grande, in the state of Rio Grande do Sul, southern Brazil, highlighting phallic sclerites, calling song and body morphometry. We designate the lectotype male, provide a combination of diagnostic characteristics and discuss the taxonomic situation of South American Gryllus species.

}, keywords = {bioacoustics, Brazil, cricket, genitalia, insects, pars stridens}, doi = {10.1111/ens.2011.14.issue-110.1111/j.1479-8298.2010.00412.x}, url = {http://doi.wiley.com/10.1111/ens.2011.14.issue-1}, author = {Luciano de P. Martins and Zefa, Edison} }