Genomic and transcriptomic analyses reveal the adaptation to semi-aquatic and aquatic life in spiders

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  Genomic and transcriptomic analyses reveal the adaptation to semi-aquatic and aquatic life in spiders Abstract Spiders are largely terrestrial, but some lineages have independently adapted to marine and freshwater habitats. Although physiological and behavioral traits supporting these evolutionary transitions have been characterized, the genomic basis of adaptation to aquatic and semi-aquatic habitats in spiders remains unclear. Here, we report a chromosome-level genome assembly for the aquatic spider Argyroneta aquatica. Comparative analysis of 22 spider species supports two independent transitions in semi-aquatic (∼56 Mya) and aquatic (∼44 Mya) lineages. The aquatic spider show distinct respiratory morphology compared with terrestrial spiders, including anterior spiracles and denser tracheoles. Molecular evolution analyses identified lineage-specific shifts in selective constraint or evidence of positive selection linked to trachea development (e.g., Wnt-1, Catenin beta, TMEM23...

A review of Androctonus of Iran, with redescription of A. crassicauda (Olivier, 1807) and A. orientalis (Birula, 1900) stat. n., and descriptions of four new species (Scorpiones: Buthidae)

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A review of Androctonus of Iran, with redescription of A. crassicauda (Olivier, 1807) and A. orientalis (Birula, 1900) stat. n., and descriptions of four new species (Scorpiones: Buthidae)

Androctonus crassicauda (Olivier, 1807) is redescribed herein based on the male neotype and a female topotype. Prionurus crassicauda orientalis Birula, 1900 is removed from synonymy, and elevated to species status as A. orientalis (Birula, 1900) stat. n., based on the lectotype here by designated, paralectotype and newly collected specimens. A. rostami Barahoei et al., 2025 is synonymized with A. orientalis (Birula, 1900) stat. n., syn. n. In addition, four new species are described: A. azerianus sp. n. (Iran), A. barahoeii sp. n. (Iran), A. caspius sp. n. (Iran), A. transcaucasicus sp. n. (Armenia, Azerbaijan, Iran). All species are described and illustrated, and a map showing the confirmed distribution of the Androctonus species in Iran is provided.

Yağmur, E. A., Kovařík, F., Fet, V., Lowe, G., Moradi, M., & Kalami, F. 2025 . A review of Androctonus of Iran, with redescription of A. crassicauda (Olivier, 1807) and A. orientalis (Birula, 1900) stat. n., and descriptions of four new species (Scorpiones: Buthidae). Euscorpius, No. 422: 1-69. https://mds.marshall.edu/euscorpius/vol2025/iss422/1/