“…In his chapter, Bouchet (2006) argues that the most common groups of marine animals, like the mollusks, are reaching their estimated number of species, but in a more recent publication, Bouchet et al (2016), mention that the number of new species of mollusks yet to be described is three times larger than the current number of known and described species (150 000 vs. 50 000) and that at the current pace, it will take at least 300 years to name all the mollusks inhabiting the planet. Hence, even in well-known groups, it is not rare to find records of species new to science (e.g., Tan and Liu, 2001;Tamsouri et al, 2014) or to document the extension of species' range distributions -new regional records (e.g., Valencia-Giraldo et al, 2015;Muñoz and Londoño-Cruz, 2016;Londoño-Cruz et al, 2018), in regions where specialists or research efforts or both are scarce.…”