Annotated checklist of Orthoptera of the Maltese Islands

The representation in the Maltese Islands of the Order Orthoptera, including the Tettigonioidea, Grylloidea, Gryllotalpoidea, Tetrigoidea, Pyrgomorphoidea and Acridoidea, is reviewed for the first time in almost fifty years. A total of fifty-five species are treated, of which forty-six are accepted and nine are rejected on the basis of re-evaluated taxonomic evidence, including the re-examination of actual specimens from historical collections, and consideration of species’ distribution. Two species, namely, Platycleis sabulosa Azam, 1901 and Oecanthus dulcisonans Gorochov, 1993, are reported for the first time from the Maltese Islands. Of the confirmed taxa, the occurrence of three species, Oedipoda caerulescens caerulescens (Linnaeus, 1767), Sphingonotus obscuratus lameerei Finot, 1902, and Sphingonotus savignyi savignyi Saussure, 1884, is considered accidental and another species, Schistocerca gregaria gregaria (Forskål, 1775), is known for its dependence on episodes of passage from the African mainland, while the status of another four taxa remains unclear. Extirpation of some of the rare and localised species, such as Conocephalus conocephalus (Linnaeus, 1767), Ruspolia nitidula (Scopoli, 1786), Brachytrupes megacephalus (Lefebvre, 1827), and Heteracris adspersa (Redtenbacher, 1889), is not excluded unless appropriate conservation measures are introduced and implemented.

Prevalence rates of microsporidia in locusts and grasshoppers in South-Western Russia

Locusts and grasshoppers are dangerous polyphagous pests of agricultural crops. In the present paper, results of screening of Acridoidea populations in the South-Western Russia for microsporidia infections including locusts Locusta migratoria, Dociostaurus maroccanus, and Calliptamus italicus and grasshoppers Chorthippus loratus, Oedipoda caerulescens, and Acrida bicolor, are presented. Microsporidia prevalence rates were estimated using light microscopy of fresh smears. Out of 179 specimens of L. migratoria sampled between 2002 and 2019 in Krasnodar Territory, Astrakhan and Rostov Regions, none was infected with microsporidia. Similarly, 95 specimens of D. marrocanus from Krasnodar Territory (2017) and Dagestan Republic (2009) were also negative for microsporidia. Meanwhile, one positive case was detected for C. italicus corresponding to 0.5 % for the total amount of 192 exemplars collected from 2002 to 2019 in Krasnodar Territory, Astrakhan and Rostov Regions. As for grasshoppers, all Ch. loratus samplings in Krasnodar Territory in 2017-2019 were infected at the prevalence rates of 2.2-15 %, though no infection was found in 40 specimens in Crimea in 2019. In 56 individuals of O. caerulescens collected from Rostov Region and Krasnodar Territory, the microsporidia prevalence rate was 1.8 %. Among 96 specimens of A. bicolor, none was infected. In total, the microsporidia prevalence rates were higher in grasshoppers as compared to locusts, the difference being statistically significant at p<0.01.