Eobania constantina

Eobania constantina, and terrestrial helicid snails in general, are typically found close to the Mediterranean coast, ranging from the more humid areas near the coast to the semi-arid climate closer to the Sahara. The species is found in high abundance in Northeastern Algeria, particularly in the Kebir Rhumel basin, where it has been identified in provinces such as Mila, Constantine, Jijel, Sétif, and Oum El Bouaghi. It was also recorded further west within the Tizi Ouzou region in Kabylie as well as within the regions of Boumerdes and Algiers, and is particularly abundant in the Chettaba forest massif. It inhabits many elevations, with observations ranging from regions at sea level to more mountainous regions at ~1700 feet above sea level.

One of the earliest formal records of land snails in Algeria comes from Edward Forbes' 19th‑century work, which described terrestrial mollusks collected around Algiers and Béjaïa. These early catalogs provided the first taxonomic baselines for Algerian helicids, often based solely on shell morphology. During this era, collection was driven by European naturalists working in French colonial territories. This period saw the naming and description of many nominal taxa, some of which were later revised. Helix constantina was first described by Forbes in 1838. Taxonomic history in Algerian helicids has been complex due to morphological variation and changing genera. In particular, misinterpretations of shell morphology led researchers to mix up Massylaea and Eobania species and caused disagreements over the true classification of helicids like E. constantina. However, molecular and anatomical work revealed that the genital morphology of Massylaea species matches that considered typical of Eobania, leading to the suggestion that Eobania should be referred to as Massylaea. Early mollusc records, like those by Forbes and Terver, were written and compiled during the period of French occupation in Algeria, where French scientists were the main drivers of fieldwork and species description. …