Robuta

https://researchdiscovery.drexel.edu/esploro/outputs/journalArticle/Heliacus-Gastropoda-Architectonicidae-Symbiotic-with-Zoanthiniaria/991019350581604721 Heliacus (Gastropoda: Architectonicidae) Symbiotic with Zoanthiniaria (Coelenterata) - Drexel... gastropoda architectonicidae symbiotic drexel https://rmcg.unam.mx/index.php/rmcg/article/view/77/68 View of Late Paleocene Architectonicidae (Gastropoda: Heterobranchia) from Baja California, Mexico... baja california view late paleocene architectonicidae