You can refer to the Smithsonian publication of the late Richard S Houbrick entitled "Genus Clypeomorus Jousseaume (Cerithiidae: Prosobranchia)". Aside from that it really depends what sort of advice you need. If you need taxonomic advice then perhaps Phillipe Bouchet of the Museum National d'Histoire Naturelle in Paris, France might be able to offer it. Also the authors of the following publication (https://www.researchgate.net/profile/Mauro_Morassi/publication/291161806_How_many_native_Cerithium_species_in_the_Mediterranean_Sea_An_integrative_taxonomic_approach/links/569e733e08aee4d26ad01a3e.pdf) might have some insight for you. I hope this is at least a helpful start.
All the best!
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The monograph of Houbrick was very good at his time. However, his subspecies should all be regarded as species nowadays. Some of his species are still species aggregates, especially Cl. bifasciata fide Houbrick consist of a number of species, but this is not published nor has DNA been studied. On shells alone, I regard the Red Sea to Persian Gulf specimens as the different species Cl. clypeomorus Jousseaume.