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Mayetiola destructor (Say, 1817) originated in the Fertile Crescent region of the Middle East and is one of the most serious pests of wheat, rye and barley and more than 16 Poaceae wild species. Here, we report the occurrence of this species as an invasive pest for the first time in Iran. It was detected in wheat fields and rye in Qüshchï Pass, Urmia environ, West Azarbaijan province (September 2020) as well as in wheat fields in Bil-e Savar, Ardabil province (July 2024). The diagnostic characters and its life history as well as the photographs of the adult male and female, larvae, puparium, male genitalia and wing venation are provided. This is the second species from the genus Mayetiola that has been reported from Iran. To prevent the spread of this destructive pest in Iran, suitable management practices are urgently needed.

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A survey on the hover flies (Diptera: Syrphidae) fauna of northern Iran, between 2010 and 2011, led to the discovery of the species Pipiza accola Violovitsh, 1985. Both the genus and species are newly recorded from Iran. All the specimens were collected from Gilan and Mazandaran provinces, using Malaise traps. The diagnostic characters of P. accola and its geographical distribution is presented.  

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A survey was conducted on the fauna of the hover flies in Northern Iran in 2011. Among the collected and identified material, the genus Temnostoma Le Peletier & Serville, 1828represented by a single species, T. vespiforme (Linnaeus, 1758) is newly detected in Iran. Diagnostic characters and geographical distribution of the newly recorded species is briefly discussed.      

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In a taxonomic study of the subfamily Phasiinae (Diptera: Tachinidae), seven species and the three genera Opesia Robineau-Desvoidy, Subclytia Pandellé and Xysta Meigen are recorded for the first time from Iran. The diagnostic characters, distributional data along with the photographs of species are presented. Taxonomical positions of the genera and species are discussed.

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The Iranian fauna of Eudorylini (Diptera, Pipunculidae) is reviewed. The new material were collected in Western (Kermanshah) and Eastern (North Khorasan, Khorasan-e Razavi, South Khorasan, Sistan-o Baluchestan) provinces during 2015–2016. In total, twenty species of Eudorylini belonging to four genera known from Iran are listed. Four species, Claraeola conjuncta (Collin, 1949), Clistoabdominalis nitidifrons (Becker, 1900), Dasydorylas discoidalis (Becker, 1897) and Eudorylas jenkinsoni Coe, 1966 are newly recorded from Iran. A brief diagnosis is presented for the newly recorded species.

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The fauna of the family Tachinidae (Diptera) was studied in the Haftad-Qolleh Protected Area, Markazi province, Iran. A total of 86 species belonging to 67 genera have been collected of which 46 species within 19 genera are newly recorded from Iran. The species Magripa persica Gilasian & Ziegler sp. nov. is described as new to science. Diagnostic characters for the newly recorded taxa are provided. Illustrations of the male terminalia and head of the new species as well as habitus images of the new records are presented.

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Six new species of the genus Eumerus Meigen, 1822 are here described from Iran. The new species and their four related groups are as follows: E. nadoosheni Gilasian & van Steenis sp. nov. of the Eumerus barbarus group; E. pollinipedes Gilasian & van Steenis sp. nov. of the Eumerus minotaurus group; E. effossus Gilasian & van Steenis sp. nov. and E. similis Gilasian & van Steenis sp. nov. of the Eumerus obliquus group, as well as E. intermedius Gilasian & van Steenis sp. nov. and E. khiabani Gilasian & van Steenis sp. nov. of the Eumerus ornatus group. In addition, the species E. argyropus Loew, 1848 and E. torsicus Grković & Vujić, 2015 are newly recorded from Iran. The illustrations of the male genitalia and images of the new species are provided.

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The fall webworm, Hyphantria cunea (Drury, 1773) (Lepidoptera, Erebidae), is one of the most important pests of forest trees in northern Iran. In order to identify the native parasitoids of this pest a survey was conducted in Guilan province, in 2019. The larvae and pupae of the fall webworm suspected being parasitized, were collected from different host trees and wood piles, and reared under laboratory conditions until the parasitoids emerged. This pest was found parasitized with five species of Hymenoptera, Brachymeria lasus (Walker, 1841) (Chalcididae), Chouioia cunea Yang, 1989 (Eulophidae), Psychophagus omnivorus (Walker, 1835) (Pteromalidae), Pimpla rufipes Brulle, 1846, Virgichneumon dumeticola (Gravenhorst, 1829) (Ichneumonidae), and four species of Diptera, Compsilura concinnata (Meigen, 1824), Exorista larvarum (Linnaeus, 1758), Pales sp. (Tachinidae), and Megaselia scalaris (Loew, 1866) (Phoridae). Among them six species (e.g., P. rufipes, V. dumeticola, B. lasus, E. larvarum, C. concinnata and Pales sp.) are newly reported as the parasitoids of H. cunea from Iran.

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Minthodes oramanatae Gilasian & Ziegler sp. nov. is described as new to science from western province of Kermanshah, Iran. This species is separated from other Minthodes species by its shiny black abdomen, narrow frons, long postpedicel, presence of basal scutellar marginal setae, short petiole of wing cell r₄₊₅ and absence of marginal setae on abdominal tergite 2. Photographs of the male habitus and terminalia are given. The comparison of the morphological characters of M. oramanatae Gilasian & Ziegler sp. nov. with its closely related species M. atra (Kugler, 1971) and M. rossica (Mesnil, 1963) is provided. Photographs of the habitus and male terminalia of M. atra are presented for the first time. The identification key to the Iranian Minthodes species is provided.

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The family Hybotidae (Insecta: Diptera, Empidoidea) is recorded for the first time from mangrove habitats in Iran (Hormozgan Province). Four species belonging to the subfamily Tachydromiinae have been found of which two species are recorded for the first time from the territory of Iran: Crossopalpus subaenescens Collin, 1960 (broadly distributed over the Middle East) and Elaphropeza feminata Shamshev & Grootaert 2007 (known only from mangroves of Singapore). In addition, E. feminata is newly recorded species for the Palaearctic Realm. Two species are described and illustrated as new to science: Drapetis hormozganiensis sp. nov. and Elaphropeza marduoensis sp. nov. The mangrove habitats in Iran do not consist of high hybotid species richness comparing with the high diversity of this family in mangroves of tropical areas. Morphologically, recorded species of Crossopalpus and Drapetis have the closest allies amongst the Palaearctic species. However, the species of Elaphropeza is closely related to the known Oriental species (primarily from Singapore).

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The discovery of the Holarctic tachinid genus Solieria Robineau-Desvoidy, 1849, in Iran led to the identification of a new species to science, which is described here as Solieria variabilis sp. nov. It can be separated from other related species by the absence of discal setae on abdominal tergites, lack of proclinate and latero-reclinate orbital setae in the male, the width of frons, and by colouration and microtrichosity of abdomen. The comparison of the morphological characters of S. variabilis sp. nov. with its close relatives S. fenestrata (Meigen, 1824) and S. pacifica (Meigen, 1824) is provided. Photographic images of the habitus and head as well as illustrations of terminalia are given.