Cirripedes (Crustacea, Thoracica) from the Eocene (Lutetian–Bartonian) of the United Kingdom, France and Romania

New material of cirripedes from the Lutetian of Campbon and Le Bois-Gouët (Loire-Atlantique, France), the Bartonian of Florești (Transylvania, Romania) and the Priabonian of the Isle of Wight (UK) provides novel insights into the taxonomy and distribution of the group during this period. The UK material of Aporolepas reflexa (J. de C. Sowerby, 1829) permits the first reconstruction of the capitular morphology of the genus. Aporolepas angulata var. crepidula Withers, 1953 is raised to species level on the basis of material from Campbon, and Aporolepas sp. from Romania constitutes the first record of the genus from eastern Europe. Possible records of a surviving Mesozoic cretiscalpellid and a virgoscalpelline (scalpellid) from Florești, are based on single plates and need further material for confirmation. Abundant Lutetian and Bartonian balanomorphs from Campbon and Romania, respectively, are referred to Vectibalanus erisma (J. de C. Sowerby, 1846), a species previously recorded only from the Hampshire Basin (UK). Archaeobalanus semicanaliculatus Menesini, 1971, from the Bartonian of the Paris Basin (France), is a probable junior synonym of V. erisma. Species of the genera Aporolepas Withers, 1953 and Vectibalanus Gale, 2020 are found along the Gulf and Atlantic seaboards of the USA, in northern and western France and the southern UK, and extend east to Romania. They were able to tolerate low salinities and their ranges extended from fully marine environments into brackish waters.