For better management of marine gastropods in the Ivorian Exclusive Economic Zone (ZEE), an inventory of the species landed in Abidjan has been carried out. Sampling was done on catches from industrial and artisanal fisheries. Three sites located in Abidjan respectively at the fishing port, in Zimbabwe and in Abobo Doumé were visited during the period from January 2016 to January 2018. At the end of this study, 2622 individuals were collected. Species identification was based on the identification method proposed by Gaillard (1987), Fischer et al (1981), and Marche-Marchad (1975). The taxonomic names (scientific, French and English) were verified using the World Taxonomy Register of Marine Species called "World Register Marine Species". A total of eleven species divided into seven families (Cassidae, Melongenidae, Muricidae, Naticidae, Ranellidae, Tonnidae and Volutidae) have been identified. The volutidae family includes three landed species: Cymbium glans, Cymbium souliei and Cymbium tritoni. In this family, the species Cymbium glans and Cymbium souliei were the most frequent (frequency of occurrence greater than 50%). This family plays an important role in the trade of marine gastropods of the Ivorian fishery.

Two species of snails (Achatina achatina and Archachatina ventricosa), from surrounding forest of Azaguié’s district, were collected at the market of the locality aforementioned in order to identify their various parasites. For that, 50 snails of each species were sacrificed. Parasites were searched on the level of the flesh, between the flesh and the shell, the stomach, the intestine, the liver and the reproductive apparatus. The collected parasites were Balantidium spp, the larvae of Protostrongylus spp, the larvae of Dicrocoelium spp and Trichomonas spp. Our results showed that 52% of Achatina achatina and 74% of Archachatina ventricosa were parasitized. Among the parasites collected in the snail Achatina achatina, 95.8% were nematodes and 4.1% were trematodes. Whereas in the snail Archachatina ventricosa, 97.7% were protozoa, 8.8% nematodes and 0.4% consisting with trematodes. The prevalence of Protostrongylus spp (48%) were higher than that of Dicrocoelium spp (4%) in Achatina achatina. For the snail Archachatina ventricosa, the prevalence of parasite were dominated by Trichomonas spp (38%) and Protostrongylus spp (24%).

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The diversity of terrestrial Molluscs was studied in the National Center for Floristry (NCF) located at the University Felix Houphouet Boigny of Abidjan (Côte d'Ivoire) by combining the direct method and method of sampling litter. A total of 2626 individuals, belonging to 22 species and six families, were harvested from the 15 plots of the study area. Species richness ranges from eight to 21 species with an average of 12.66 ± 3.73. It was dominated by Subulinidae (50%) which are herbivores, and Streptaxidae (22.73%) which are carnivorous. Each plot yielded between 65 and 392 individuals (mean 175.06 ± 77.54). Numerical abundance was dominated respectively by Archachatina ventricosa with 23.61% (620 specimens), Limmicolaria flammea with 21.36% (561 specimens), and Achatina fulica with 16.60% (436 specimens). Based on the importance of the diversity of Molluscs, steps must be taken towards a better management policy for this center because these species has already been threatened by human activities.