{"id":34197,"date":"2022-05-23T21:50:32","date_gmt":"2022-05-23T19:50:32","guid":{"rendered":"https:\/\/opistobranquis.info\/?page_id=34197"},"modified":"2026-10-19T11:14:38","modified_gmt":"2026-10-19T09:14:38","slug":"architectonicoidea","status":"publish","type":"page","link":"https:\/\/opistobranquis.info\/en\/guia\/architectonicoidea\/","title":{"rendered":"Architectonicoidea"},"content":{"rendered":"

Architectonicoidea are a superfamily of marine gastropod molluscs characterised by their generally flattened shells, often disc-shaped or forming a low spiral, and by anatomy adapted to a particular way of life. Unlike many other gastropods that actively roam the seabed in search of food, members of this group exhibit a highly specialised ecology, closely associated with other marine organisms, particularly cnidarians.<\/p>\n

\"Heliacus<\/div>
Heliacus fallaciosus @ Eivissa, Spain May, 2022<\/em> by Joan Pereyra<\/center><\/span>

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The shell is one of the group’s most characteristic features. In many species, it has a low spire and a broad base, with a relatively large aperture and often a deep umbilicus that gives it a distinctive appearance. Shell shape and ornamentation vary among genera and species and provide useful identification characteristics. Although some species can reach a considerable size, many are small and easily overlooked among the organisms covering the substrate.<\/p>\n

Architectonicoidea inhabit mainly tropical and temperate seas, where they can be found on sandy bottoms, rocky substrates and other benthic environments. Some species live in association with sea anemones and other cnidarians, on which they may feed. This relationship with organisms possessing stinging cells is one of the most interesting aspects of their biology and reflects the degree of ecological specialisation that marine gastropods can achieve.<\/p>\n

Among the best-known representatives are species of the genus Architectonica, with their characteristic discoidal shells and distinctive ornamentation, as well as other forms displaying considerable variation in spire geometry and shell structure. These differences, together with anatomical characteristics and molecular data, help establish the evolutionary relationships within the superfamily.<\/p>\n

Although the shells of some species are easily recognisable and highly valued by collectors, the living animals are much less familiar. Their often inconspicuous habits, association with other invertebrates and the difficulty of observing them in their natural habitat mean that aspects of their biology and ecology still require further investigation.<\/p>\n

Architectonicoidea therefore represent an interesting example of the evolutionary diversity of marine gastropods. The combination of a distinctive shell, specialised lifestyles and particular ecological relationships makes them a relevant group for understanding the complexity of benthic communities and the many strategies molluscs have evolved to exploit resources in the marine environment.<\/p>\n

Taxonomy of the Architectonicoidea according to WoRMS is:<\/p>\n