Interspesific variation in morphology between populations is not uncommon in many animal groups including scorpions. These variations may be responses to differences in habitats and/or climate. Sarra Hajri and co-workers have recently published a study of the morphometrical variations among populations of in Buthus tunetanus (Herbst, 1800) (Buthidae) in Tunisia.
Abstract:
Intraspecific variation among geographical separated samples has been documented in many scorpion species. This study focuses on morphometrical variation in Buthus tunetanus from Tunisia, in order to find morphometric features that could best distinguish different populations and highlight adaptative morphometric response. Thirteen morphometric variables were measured across 180 adult specimens. Statistical analysis, mainly based on discriminant factorial analysis, showed net intraspecific variability for males and females. Metasoma and telson size represent the most discriminant factor behind the recorded variation, which makes it a great candidate of natural selection. The morphology of this part is closely linked to the assault method and venom effectiveness which are controlled by each environment’s level of risk, the size, quality, and availability of prey. The Ouled Brahim’s and Oueslatia’s populations are the most discriminant ones when compared with other regions samples. The first population, belonging to a complex geological area, is distinguished by its sizeable segments. However, the second population, belonging to a semi-isolated area, is characterized by its dwarf segments.
Reference:
Hajri S, Bahri L, Nouira S. Morphometrical Variation in Buthus tunetanus (Scorpiones: Buthidae) from Tunisia. Biology Bulletin. 2026;53:143. [Subscription required for full text]
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