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Temnothorax (Myrmicinae, Crematogastrini) is one of the most diverse Holarctic ant genera, and new taxonomic advancements are still frequent worldwide. The Mediterranean region, a global biodiversity hotspot characterized by a complex geographic history, is home to a substantial portion of its described diversity. Sicily is the region’s largest island and, as ongoing investigations are revealing, it is inhabited by a long-overlooked but highly diverse ant fauna that combines multiple biogeographic influences. We combined qualitative and quantitative morphology of multiple castes with phylogenomic analysis based on ultra-conserved elements (UCEs) to describe four species of Temnothorax endemic to Sicily and the neighboring Maltese Islands (Sicilian Channel). Three of these species, T. marae Alicata, Schifani & Prebus sp. nov., T. poldii Alicata, Schifani & Prebus sp. nov. and T. vivianoi Schifani, Alicata & Prebus sp. nov., are new to science, while a redescription clarifies the identity of T. lagrecai (Baroni Urbani, 1964). These descriptions highlight the current difficulties of delimiting monophyletic Temnothorax species groups based on morphological characters. The intra-insular endemicity patterns we revealed highlight the importance of Mediterranean paleogeography to contemporary ant diversity and distribution in the region.
The following new species are described from the Maghreb: Tapinocyba algirica n. sp. and Walckenaeria heimbergi n. sp. The unknown male of Minicia elegans and the unknown females of Alioranus pauper, Cherserigone graciipes and Entelecara truncatifrons are described. Tmeticus hipponense is transfered to the genus Gongylidiellum and HybocoptliS ericicola is removed from synonymy with H. corrugis and revalidated. The Maghrebian species of the genera Alioranus, Brachycerasphora, Cherserigone, Didectoprocnemis, Entelecara, Eperigone, Erigone, Gnathonarium, Gonatium, Gongylidiellum, Hybocoptus, Lessertia, Maso, Mierargus, Microetenonyx, Minicia, Monocephalus, Nematogmus, Ostearius, Prinerigone, Styloetetor, Tapinocyba, Triehoncoides and Trichoncus are all revised. As a final paper in a series on the Linyphiidae of the Maghreb, all the remaining genera are reviewed. A total of 169 species of Linyphiidae has currently been recorded in the Maghreb.