Journal of The Malacological Society of London Molluscan Studies Journal of Molluscan Studies (2014) 80: 412–419. doi:10.1093/mollus/eyu037 Advance Access publication date: 20 June 2014 Morphological expression and histological analysis of imposex in Gemophos viverratus (Kiener, 1834) (Gastropoda: Buccinidae): a new bioindicator of tributyltin pollution on the West African coast Ruy M. A. Lopes-dos-Santos1, Corrine Almeida2, Maria de Lourdes Pereira3, Carlos M. Barroso4 and Susana Galante-Oliveira4 1Biology Department, University of Aveiro, Campus Universita´rio de Santiago, 3810-193 Aveiro, Portugal; 2Department of Engineering and Sea Sciences (DECM), University of Cabo Verde, Campus da Ribeira de Julia˜o, CP 163 Sa˜o Vicente, Cabo Verde; 3Biology Department & CICECO, University of Aveiro, Campus Universita´rio de Santiago, 3810-193 Aveiro, Portugal; and 4Biology Department & CESAM, University of Aveiro, Campus Universita´rio de Santiago, 3810-193 Aveiro, Portugal Correspondence: R. M. A. Lopes-dos-Santos; e-mail:
[email protected] (Received 8 January 2014; accepted 24 March 2014) ABSTRACT We describe the reproductive system and morphological expression of imposex in the marine gastropod Gemophos viverratus (Kiener, 1834) for the first time. This species can be used as a bioindicator of tributyl- tin (TBT) pollution on the west coast of Africa, a region for which there is a lack of information regard- ing levels and impacts of TBT pollution. Adult G. viverratus were collected between August 2012 and July 2013 in Sa˜o Vicente Island (Republic of Cabo Verde), at pristine sites on the northeastern and eastern coasts and at Porto Grande Bay, the major harbour in the country.